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  • Model question papers prepared by Master trainers, Department of PU education, Bangalore. II-PUC CHEMISTRY

    BLUE PRINT FOR MODEL QUESTION PAPER - 1

    Group Unit Title Hours Marks

    PartA I

    10 1 Mark

    Part-B II

    8 2 Mark

    Part-C III

    8 3 Mark

    Part-D IV & V 11 5 Mark

    Total

    Group I Physical

    1 The Solid state 8 07 07 2 Solution 9 07 07 3 Electrochemistry 9 08 08 4 Chemical Kinetics 9 08 08 5 Surface chemistry 6 05 05

    Total of Group -I 41 35 35

    Group II Inorganic chemistry

    6 General principles and processes of isolation of elements

    5 04 04

    7 The p-block elements 11 10 10 8 The d and f- block elements 9 08 08 9 Co-ordination Compounds 7 07 07

    Total of Group -II 32 29 29

    Group III organic

    chemistry

    10 Haloalkanes and Haloarenes 7 06 06 11 Alcohols, phenols and ethers 8 07 07 12 Aldehydes, Ketones and carboxylic acids 9 08 08 13 Amines 6 05 05 14 Biomolecules 7 06 06 15 Polymers 5 05 05 16 Chemistry in everyday life 5 04 04

    Total of Group -III 47 41 41 TOTAL 120 105

    .2

  • -2- II PUC CHEMISTRY (34)

    MODEL QUESTION PAPER - 1 Time: 3 hours 15 minutes Maximum Marks: 70

    Instructions:

    1. The question paper has four parts: A, B, C and D. All parts are compulsory. 2. Write balanced chemical equations and draw labelled diagrams wherever required.

    3. Use log tables and the simple calculators if necessary. (Use of Scientific Calculators is not allowed)

    PART- A

    I. Answer ALL of the following. ( Each questions carries 1 mark) 10 1 = 10

    1. State Henrys law. 2. What is the conclusion drawn when Vant Hoffs factor of a solution is less than one?

    3. How molar conductivity varies with dilution? 4. Mention one criterion for intermolecular collisions of two reactants to be effective.

    5. Name the metal that is refined by Van Arkel method. 6. Name the first noble gas compound prepared by Neil Bartlett? 7. Give an example for Heteroleptic complex. 8. Write the IUPAC name for CH3-CH(CH3)-CH2Cl. 9. Give the name of the product X.

    10. Name the storage polysaccharide present in animals.

    PART- B

    II. Answer Any FIVE of the following. ( Each questions carries 2 mark) 5 2 = 10 11. a) Give one example for paramagnetic substance.

    b) Which type of binding force existing in ice? 12. Write anodic and cathodic half-cell reactions taking place in Daniel cell. 13. Show that for first order reaction t87.5% = 3 t50%. 14. What is lanthanide contraction? What is the cause for it?

    15. How do you convert bromoethane into tertiary-butylethyl ether? Give the chemical equation of the reaction.

    16. What is Stephens reaction? Give the chemical equation of the reaction. 17. What is the therapeutic action of a) Paracetamol b) Barbituricacid. 18. What are anionic detergents? Give an example.

    PART- C III. Answer Any FIVE of the following. ( Each questions carries3 mark) 5 3 = 15

    19. Explain the extraction of aluminium from purified alumina by Hall-Heroult process.

    3 20. Explain manufacture of nitric acid by Ostwalds process.

    3 .3

    CO, HCl

    Anhyd AlCl3 / CuClX

  • -3-

    21. a) How is ozonised oxygen prepared?

    2 b) Write the structure of sulphurous acid. 1

    22. a) How does phosphorus react with limited amount of chlorine? Give equation. 2

    b) What is the product obtained by the reaction between fluorine in excess of bromine? 1

    23. a) 3d Transition metals and their compounds are good catalysts. Give two reasons? 2

    b) Give the formula for the calculation of spin only magnetic moment. 1 24. Explain the manufacture of Potassium dichromate from chromite ore.

    3 25. Using VBT explain, 3

    i) Geometry of the complex ii) Type of hybridization, in the complex ion [CoF6] 3-. iii) Is it an inner or outer orbital complex?

    26. a) Draw the structures of cis -trans isomers for [Pt (NH3)2.Cl2]. 2

    b) How many ions are produced from the aqueous solution of complex K3[Al(C2O4)3] 1

    PART D

    IV. Answer Any THREE of the following. ( Each questions carries5 mark) 3 5 = 15 27. a) Calculate the packing efficiency in a Face Centered Cubic lattice. 3 b) If a metal with atomic mass 209 crystallizes in a simple cubic lattice what is the edge length of its unit

    cell. (Given d = 91.5 kg m-3). 2 28. a) 5.8g of a non-volatile solute was dissolved in 100g of carbon disulphide (Molar mass = 76). The

    vapour pressure of the solution was found to be 190mmHg. Calculate the molecular mass of the solute. The vapour pressure of pure carbon disulphide 195 mm Hg. 3 b) What are azeotropes? Give an example. 2

    29. a) The resistance of M/10 solution is found to be 2.5 X 103 ohms. Calculate molar conductance (Given Cell constant = 1.15 cm-1). 3

    b) Mention two general methods for prevention of corrosion. 2 30. a) Derive an expression for rate constant of a first order reaction.

    4 b) What is the effect of positive catalyst on energy of activation? 1

    31. a) Mention two factors which affect adsorption of a gas on a solid. 2

    b) Is synthesis of ammonia by Habers process, a homogeneous or heterogeneous catalysis? 1

    c) State Hardy-Schulze rule. Among Al2(SO4)3 and (NH4)3PO4 which is better coagulating agent for a negative sol ? 2

    .4

  • -4- V. Answer ANY FOUR of the following. ( Each questions carries 5 mark) 4 5 = 20

    32. a) Complete the following reaction and write its name

    2C6H5Cl + 2Na ? + 2NaCl 2 b) Explain Zaitsev rule with an example. 2 c) A Haloalkane when boiled with aqueous KOH which gives an alcohol having inversed configuration.

    Name the mechanism involved in this reaction. 1 33. a) Explain the mechanism involved in the conversion of ethanol into ethene.

    3 b) An organic compound with molecular formula C6H6O gives white precipitate with bromine water.

    Identify the functional group in the organic compound and write the chemical equation for the reaction.

    34. a) Explain Cannizaros reaction with an example. 2

    b) Name the product obtained by the reaction of acetyl chloride with dimethylcadmium. 1

    c) Explain the reaction between carboxylic acid and PCl5. 2 35. a)Explain carbylamine reaction by taking methyl amine as an example. 2 b) Why do primary amine have higher boiling point than tertiary amines? 1 c) Give an example for a coupling reaction of diazonium salt and give its chemical equation.

    2 36. a) Deficiency of which vitamin leads to night blindness?

    1 b) Which hormone is responsible for the hyperthyroidism? 1 c) What is a Zwitter ion of an amino acid? Give its general formula. 2 d) What is a nucleotide? 1

    37. a) What are Elastomers? Give example. 2

    b) Write the partial structure of nylon 6, 6 and Bakelite. 2 c) What is vulcanization of rubber? 1

    .5

    Dry ether

  • -5- II PUC CHEMISTRY (34)

    SCHEME OF VALUATION FOR MODEL QUESTION PAPER 1 Note: Any other correct alternate answer can be honoured wherever applicable. I. PART - A Marks

    1. Henrys law states that the partial pressure of the gas in vapour phase is proportional to the mole fraction of the gas in the solution. OR The mole fraction of the gas in the solution is proportional to the partial pressure of the gas over the solution.

    1

    2. The solute in the solution undergoes association. OR Tb or Tfwill be half of the normal value and molar mass will be twice the expected value.

    1

    3. It increases with dilution 1

    4. Proper orientation of molecules. or Energy of activation of the molecules.

    1

    5. Zirconium OR Zr OR Titanium OR Ti

    1

    6. Xenonhexafluroplatinate(IV) 1

    7. [Co(NH3)4 CO3] Cl OR any suitable example 1

    8. 1-Chloro-2-methylpropane 1

    9. Benzaldehyde 1

    10. Glycogen 1

    II. PART -B

    11. a) O2 OR Compounds of Cu+2 OR Fe+3 OR Cr+3 OR any suitable example. 1 b) Hydrogen bonding 1

    12. 2(s)

    2(s)

    At anodic : Zn Zn 2e

    At Cathodic :Cu 2e Cu

    + -

    + -

    +

    +

    1 1

  • 13.

    87.5%

    87.5%

    50%

    50%

    87

    Expression of k when87.5% of react an t is reacted2.303 100k logt 12.52.303k x 0.9031 (1)t

    Expression of k when 50% of react an t is reacted2.303 100k logt 50

    2.303k x 0.3010 (2)t

    K Equation (1) / Equation (2)t

    =

    = - - -

    =

    = - - -

    =

    .5% 50%t=

    1 1

    14. The overall decrease in atomic and ionic radii from Lanthanum to Lutetium is known as Lanthanide Contraction. It causes radii of 3rd transition series to be very similar with those of the corresponding members of second transition series.

    1 1

    15. C2H5Br + (CH3)3C-O-Na (CH3)3C-O-C2H5 + NaBr Explanation

    1 1

    16. RCN + SnCl2 + HCl RCH = NH RCHO Explanation

    1 1

    17. a) Decreases body temperature during fever b) Tranquilizer

    1 1

    18. The sodium salts of sulphonated long chain alcohols or hydrocarbons are called anionic detergents. Example: Sodium lauryl Sulphate

    1 1

    III. PART C

    19. Diagram At cathode: Al3+(Molten) + 3e- Al(l) At anode: C(S) + O2- CO (g) + 2e- or C(S) + 2O2- CO2(g) + 4e-

    1 1 1

    20. Catalytic oxidation of ammonia by atmospheric oxygen.

    4NH3(g) + 5O2(g) / / > 4NO(g) + 6H2O(g)

    Nitiric oxide oxidises into nitrogen dioxide 2NO(g) + O2(g) 2NO2(g) Nitrogen dioxide dissolves in water to give nitric acid 3NO2(g) + H2O(l) 2HNO3( aq) + NO(g)

    1 1 1

    21. a) Explanation

    3O2 > 2O3

    b) OH O S O H- - - -

    P

    1 1 1

    22. a) Explanation P4 +6 Cl2 4PCl3 b) BrF5

    1 1 1

    H+

  • 23. a) 1) Large surface area, 2) Variable valence

    b) n (n 2= +

    1 1 1

    24. Explanation with 4 FeCr2O4 + 8 Na2CO3 + 7 O2 8 Na2CrO4 + 2 Fe2O3 + 8 CO2 2Na2CrO4 + 2 H+ Na2Cr2O7 + 2 Na+ + H2O Na2Cr2O7 + 2 KCl K2Cr2O7 + 2 NaCl

    1 1 1

    25. Geometry:- Octahedral Hybridisation:- sp3d2 Type of complex:- Outer orbital complex

    1 1 1

    26. a) structure of isomers b) 4 ions

    1 + 1 1

    IV.

    27. a) Packing efficiency = %

    = 3

    3

    44x r x 100%

    a3 edge length a 2 2 r=

    = % =74%

    3

    A

    23 3

    6

    Z .Mb) aN .d

    1x 2096.023x10 x 91.5 x103.359 x10 cm

    -

    -

    =

    =

    =

    1 1 1 1 1

    28. 00

    1

    P P w.Ma)P m W

    195 190 5.8x 76195 m x100

    5.8x 76 x195m100 x 5

    171.9g mol-

    -=

    -=

    =

    =

    b) A solution which distils over without change in composition Example: 95.6% ethanol + 4.4 % water OR any other suitable example.

    1 1 1 1 1

  • 29

    3

    4 1 1

    m

    4

    1 2 1

    l la) k xA R

    11.15 x2.5x10

    4.60 x10 ohm cm1000 x k

    M1000 x 4.60 x10

    0.14.60ohm cm mol

    - - -

    -

    - -

    =

    =

    =

    L =

    =

    =

    b) i) painting ii) Electrochemical method Or any other suitable method

    1 1 1 1 1

    30 a) Consider a first order reaction R P

    [R] [ ]dRate k Rdt

    = - =

    d[R] k dt[R]

    = -

    Integrating the above equation we get

    ( )ln[R] k t I .......... 1= - + When t =0 , [R] = [R]0 Equation (1) becomes

    0ln[R] I= Therefore equation (1) becomes

    0

    0

    0

    ln[R] k t ln[R][R]1k ln

    t [R][R]2.303k log

    t [R]

    = - +

    =

    =

    b) Energy of activation decreases

    1 1 1 1 1

    V.

    31 a) i) Surface area of adsorbent ii) Nature of adsorbent or adsorbate or any suitable factor b) Heterogeneous Catalysis c) Greater the valency of the flocculating ion added, greater is its power to cause precipitation Al2(SO4)3

    2 1 1 1

    32

    or Biphenyl Fittig reaction

    1 1 1

  • b) In dehydrohalogenation reaction the preferred product is that alkene which has the greater number of alkyl groups attached to the doubly bonded carbon atom

    CH3CHCHCH3 + KOH(alc) CH3CH=CHCH3 + KBr + H2O c) SN2

    1 1

    33. a) Step: 1 : Formation of protanated alcohol Equation Step 2: Formation of Carbocation Equation Step 3: Elimination of proton and formation of alkene Equation b) The organic compound is phenol

    1 1 1 1 1

    34 a) Statement NaOH

    3

    6 5 6 5 2 6 5

    2H CHO CH OH H COONaOR2C H CHO KOH C H CH OH C H COOK

    - + -

    + +

    b) Acetone c) Explanation R-COOH + PCl5 R-COCl + POCl3 + HCl

    1 1 1 1 1

    35. a) Correct Explanation Heat

    2 3 2R NH CHCl 3KOH R NC 3KCl 3H O- + + - + + b) Due to intermolecular association OR more hydrogen bonding

    c) CuCl/HCl2 2ArN X ArCl N + Explanation

    1 1 1 1 1

    36. a) Vitamin A b) Thyroxin c) The amino acid forms dipolar ion called Zwitter ion in the aqueous solution.

    R - CH - COOH

    NH2

    R - CH - COO

    NH3+Covalent form Zwitter ion

    d) Basic unit of nucleic acid containing one sugar unit ,heterocyclic base and phosphoric acid is called nucleotide

    1 1 1 1 1

    37. a) The polymers that have elasticity, like rubber in which polymer chains are held together by the weakest intermolecular forces are referred to as elastomers. Example: natural rubber, neoprene, vulcanized rubber. b) Nylon:

    1 1

    OH

    Br2

    OHBr

    Br

    Br

    HBr+ 3 + 3

    2,4,6 - tribromophenol

    H Br

  • Bakelite :

    c) Rubber when heated with sulphur with an appropriate additive to a temperature of 373K to 415K

    1 1 1

  • MODEL QUESTION PAPER 2 PUC II

  • Model Question Paper-2 PUC-II

    CHEMISTRY

    Time: 3 hr-15 min. Batch-02 Max Marks: 70

    Instructions:

    i) The question paper has four parts, A, B, C and D. All parts are compulsory ii) Part-A Carries 10 marks Part-B Carries 10 marks Part-C Carries 15 marks Part-D Carries 35 marks iii) Write balanced equations and draw diagrams wherever required (Use log tables and the simple commercial calculator if necessary (use of scientific calculator is not allowed)

    Part-A I. Answer all questions, 10 X 1=10

    1. Define the term molality. 2. How does the enthalpy change during the formation of a non-ideal solution two liquids showing positive

    deviation from Raoults law? 3. What is a primary electrochemical cell? 4. For the reaction 1130K/Mo3(g) 2(g) 2(g)2NH N 3H + what is the order? 5. What do you mean by selectivity of a catalyst? 6. Give the chemical composition of Copper matte. 7. Name the noble gas that is radioactive? 8. Write the general equation of the preparation of alkyl chlorides from alcohols using SOCl2. 9. What are acetals? 10. Name the water insoluble component of the starch?

    Part-B II. Answer any five of the following each questions carries two marks 5 X 2=10

    11. An element having atomic mass 60 amu. has FCC unit cell. The edge length of the unit cell is 4x 102 pm. Find the density of the unit cell.

    12. Write two applications of Kohlrausch law. 13. The half-life period of a certain reaction is directly proportional to initial concentration of the reactant.

    predict the order of the reaction and write the expression to calculate the half-life period of the reaction. 14. Give two consequences of lanthanoids contraction. 15. Complete the following reaction;

    i) 0Cu/300 C

    3 2CH CH OH ?

    ii) 2 R COOH RCH OH- . Name the reagent used in the conversion? 16. How does ketone react with ethylene glycol. Write chemical equation for the reaction. 17. What are analgesics? Give an example for non-narcotic analgesics. 18. What are artificial sweeteners? Give an example.

    Part-B

    III. Answer any five of the following each questions carries three marks 5 X 3=15

  • 19. On the basis of Ellinghams diagram explain the principle of extraction of iron from its oxide ore. 20. Explain the principles involved in the manufacture of ammonia by Habers process. 21. Complete the following equations;

    2

    22 4 2 4

    3 2 4MnO

    3

    a) 5SO MnO 2H O 5 SO 4H ?

    b)5SO Conc.H SO ?

    c) 2KClO ?

    - - ++ + + +

    +

    1+1+1

    22. a) Explain the action of Conc. HCl on KMnO4 crystals 2 b) Write the structure of perchloric acid. 1 23. a) Transition metals show variable oxidation states. Explain 2 b) Which metal of 3d-series exhibit maximum number of oxidation state? 1 24. How is K2Cr2O7 manufactured from chromite ore. 3 25. Using valence bond theory (VBT), account for the geometry, type of hybridization and magnetic property

    of [NiCl4]2- 3 26. Define linkage isomerism of co-ordination compounds. Give an example 3

    Part-D IV. Answer any three of the following, each question carries five marks 5 X 3=15

    27. a) Calculate the packing efficiency in BCC lattice 3 b) Calculate the number of particles per unit cell in FCC 2

    28. a) Acetone boils at 56.38oC and a solution of 1.41g of an organic compound in 20 g of acetone boils at 56.88oC. Calculate the molar mass of the organic compound (Given Kb for acetone =1.67 K kg/mol). 3 b) what is reverse Osmosis, mention one important application of it. 2

    29. a) Standard EMF of the cell; Cu Cu2+(1M) Ag+(1M) Ag is 0.46 V at 25 oC. Find the value of standard free energy change for the reaction that occurs in the cell. 3

    b) Draw the neat labeled diagram of SHE and write its symbolic representation. 2 30. a) Derive the integrated rate equation for a zero order reaction 3 b) Give any two differences between order and molecularity of reaction 2

    31. a) Write any two differences between lyophilic sols and lyophobic sols 2 b) What are the differences between physisorption and chemisorption 2

    c) Give an example for homogeneous catalysis 1

    V. Answer any four of the following, each question carries five marks 4 X 5=20

    32. a) i) Name the organic product formed when chloroalkane is heated with concentrated solution of sodium iodide (NaI) in acetone?

    ii) Write the chemical equation for the above reaction

    iii) Name the above reaction (1+1+1)

    b) Explain Fittigs reaction with an equation 2

    33. a) Organic compounds A, B and C are aliphatic saturated hydroxyl compounds when they react with Lucas reagent (anhyd.ZnCl2 + conc. HCl ), the following observations are made

    i) Compound A gave turbidity immediately (1+1+1)

    ii) Compound B gave turbidity after five minutes

    iii) Compound C gave turbidity only on heating, Identify the type of compounds A, B and C.

  • b) Complete the equation: H6 5 6 5C H COOH HOC H ?+

    + 1

    c) Name the main organic product formed when anisole is reacted with HI 1 34. a) Which of the following organic compound undergoes Cannizzaros reaction? 1

    i) CH3CHO ii) HCHO b) Write the mechanism of addition of HCN to a carbonyl compounds 2

    c) Explain the conversion of carboxylic acid into an acid amide. Give the general chemical equation 2

    35. a) Explain Mendius reduction with an equation. 2 b)When aniline is treated with HNO2 at 273-278 K, benzene diazonium chloride is formed. Write the

    equation and name the reaction. 2

    c) What is Hinsbergs reagent?

    36. a) Write the Haworths structure of sucrose 2 b) What are non-essential amino acids? 1

    c) Name the heterocyclic N-containing base present only in DNA but not in RNA. 1

    d) Vitamin-C cannot be stored in the body. Give reason. 1

    37. a) Which among the following is a homopolymer and a co-polymer, 2 i) Nylon-6,6 ii) PVC

    b) How is Buna-N prepared ?. Write the equation 2

    c) Give one example for a non-biodegradable polymer

  • II -PUC Chemistry ( 34) Scheme of Valuation for model question paper -2

    Batch-02 PART-A 1. No. of moles solute present in 1 kg of solvent 1 2. H= +Ve or Enthalpy increases or heat is absorbed 1 3. A primary cell is one that cannot be recharged 1 4. Zero 1 5. It is the ability of catalyst to direct a reaction to yield a particular product 1 6. Cu2S + traces of FeS or Cuprous sulphide + traces of ferrous sulphide 1 7. Radon 1

    1 9. Acetals are gem-alkoxy alkanes in which two alkoxy groups are present 1 on the terminal carbon atom 10. Amylopectin 1

    PART-B II. 1

    1 12. i)The degree of dissociation and dissociation constant of weak electrolyte 1 (AB) Type can be calculated ii) Using this law, omfor both weak and strong electrolytes can be calculated 1 13. a) Zero order 1

    1 14. Due to lanthanide contraction i) Similarity in atomic sizes of elements of second and third transition series 1 ii) The separation of lanthanides in pure state become difficult 1

    15. i) 1 ii) LiAlH4 in the presence of THF 1 16. Ketal is formed,

    1 17. Analgesics are the chemical substances which relieve body pains 1

  • Ex. Aspirin or paracetamol 1 18. These are low calorie substances used as sweetening agents to replace sugar 1 Ex. Saccharin/ Aspartame/ Alitame/ Sucralose 1 III. PART-C 19. 1

    a) At 1073 K, GoVsT line for Intersects the 1 Line. Above 1073K, Go of becomes less than Go of and hence carbon itself is oxidized to CO. Therefore, carbon becomes very good reducing agent for the reduction of FeO to Fe at the temperature range of 900K-1500K.

    b) At temperature, below 800 K, Go for is less than 1

    , therefore, CO is a better reducing agent for the reduction of Fe2O3 to FeO

    20. i) 1 ii) According to Le-Chaterliers principle, the forward reaction is favored by 1 low temperature and high pressure iii) Optimum conditions in the process are 700 K atm. And Fe catalyst containing 1 K2O and Al2O3 promoter

    21.

    22. a) When KMnO4 is treated with conc. HCl. Chlorine is liberated

    1

    b) 1 23. a)i) ns and (n-1)d subshells have almost same energy 1 ii) Both ) ns and (n-1)d electrons involve in bonding 1 b) Mn or Manganese 1 24. i) Chromite ore in to sodium chromate

    1

  • ii)Sodium chromate in to sodium dichromate

    1 iii) sodium dichromate in to potassium dichromate

    1 25. i) Ni2+ ; [Ar] 3d8 4so

    3d8 4s 4p ii) On approach of Cl- ligands;

    SP3 hybridization 1 iii) [NiCl4] 2- formation;

    SP3 hybrid orbitals filled by electrons donated by ligands Geometry; Due to SP3 hybridization, the complex has tetrahedral structure 1 Magnetic propery; The complex is paramagnetic due to the presence of two 1 unpaired electrons 26. Linkage isomerism is one in which two co-ordination compounds have the same 2 molecular composition but differ in the mode of attachment of ligands to the central metal atom/ion. Ex: [Co (NH3)5 (NO2)] Cl2 and [Co (NH3)5 (ONO)] Cl2 1 PART-D 27. a) Edge length a=4r/3 r = radius of sphere 1 Packing efficiency = (volume of the sphere x 2 volume of unit cell) x 100 1 = (4/3 r3 x 2 x 100) a3 = (4/3 r3 x 2 x 100) 4r/3 1 = 68% b) No. of particles per unit cell of FCC

    = 18

    (No. of corner particles) + 12

    (No. of facial particles) 1

    = 18

    x 8 + 12

    x 6 = 1 + 3 = 4 1

    28. a) Tb= Kb x molality Tb= Kb x (m solute/ M solute) x 1000 / m solvent 1 (56.88-56.38) = 1.67 x (1.41/ M solute) x 1000/20 1 M solute = 235.47 1 b) It is the process of movement of solvent molecules from higher concentration to lower concentration by applying pressure greater than osmotic pressure 1 Application; It is used in desalination of sea water 1 29. a) Go = -nFEo cell n = 2 = -2 x 96500 x 0.46 F = 96500 C, Eo = 0.46 V = -108080 joules or -108.08 kjoules 2 b) For diagram 1 SHE: Pt, H2 (1 bar) / H+ (1M) 30. a) Consider a zero order reaction RP

  • Rate = K [R]0

    Rate = K x 1 where K- rate constant or velocity constant 1 Rate = -d[R]/dt -d[R]/dt = K => d[R] = - K dt d [R] = - K dt [R] = - Kt + I.(1) I- integration constant 1 To find I, when t=0, [R] = [R0] [R0] = -K x 0 + I I = [ R0] Substituting in eq (1) [R] =- Kt + [R0] K= [R0] [R]/ t 1 b)Molecularity Order of a reaction 2 i)It isalways related to reaction i) It may or may not related to reaction stoichiometry stoichiometry ii) It isalways whole number ii) It can be whole number or fraction or even zero 31. a) Lyophilic sols Lyophobic sols 2 i) Dispersed phase has greater i) Dispersed phase has no affinity for dispersion medium affinity for dispersion medium ii) Reversible ii) irreversible or any other differences b) Physisorption Chemisorption i) Adsorbate and adsorbent i) Adsorbate and adsorbent 2 are held together by weak van der are held together by strong chemical waals forces bonds ii) Reversible ii) irreversible or any two suitable differences

    c) 1 or any other suitable examples 32.a) i) Iodoalkane is formed 1

    ii) 1 Finkelstein reaction 1 b) When haloarene is heated with sodium metal in dry ether medium, higher 1 aromatic hydrocarbons is formed C6H5-X + 2Na + C6H5-X C6H5-C6H5 + 2NaX 1 33. a) i) A = Tertiary alcohol B = Secondary alcohol C = Primary alcohol 1 + 1 + 1

    Phenyl benzoate c) Phenol 1 34. a) HCHO 1

    Dry ether

  • b) HCN + OH- CN- + H2O 1

    C O CN- CO-

    CN

    H+

    C

    OH

    CN 1

    c)

    R-COOHNH3

    R-COONH4Heat

    -H2OR-CONH2

    1 Explanation: When carboxylic acid is heated with ammonia it gives acid amide. 1 35. a) Reduction of nitriles by sodium in alcohol to get a primary amine is called Mendius reduction. 1

    R-CN + 4 (H)Na/alcohol R-CH2-NH2 1

    b)

    C6H5-NH2 + NaNO2 + 2 HCl273-278K

    C6H5-N2Cl + NaCl + H2O 1 Diazotization 1 c) Benzene sulphonyl chloride or C6H5SO2Cl 1 36.a) 2

    b) Amino acids which can be synthesized by human body are called non-essential 1 amino acids c) Thymine 1 d) Excess of vitamin-C is excreted through urine 1 37. i) Nylon-6,6 Copolymer 1 ii) PVC Homopolymer 1 b) When 1, 3-butadiene is heated with acrylonitrile in presence of sodium, Buna-N is formed. 1

    H2C CH CH

    CH2 H2C CH

    CN

    Na

    HeatH2C CH

    CH CH2 CH2 CH

    CNn

    1 c) PVC or any suitable example 1

  • MODEL QUESTION PAPER 3 PUC II

  • Model paper 3 II PUC CHEMISTRY (34)

    Time: 3hours 15 minutes Maximum marks: 70 Instructions: 1. The question paper has four parts: A, B, C and D. All parts are compulsory.

    2. Write balanced chemical equations and draw labeled diagrams wherever required.

    3. Use log tables and the simple calculator if necessary. (Use of scientific calculators is not allowed)

    PART-A I. Answer ALL of the following. (Each question carries 1 mark) 10x1=10 (Answer each question in one word or in one sentence) 1. What is the effect of increase in temperature on the solubility of gas in a liquid?

    2. Define osmotic pressure .

    3. Mention the concentration of H+ ions in the solution used in SHE .

    4. From the following plot, predict the order of the reaction.

    5. 2SO2(g)+O2(g) 2SO3(g). Is this reaction an example for Homogenous or

    Heterogeneous catalysis.

    6. Name the depressant used in separation of ZnS from PbS by froth floatation process.

    7. Which noble gas does not occur in nature?

    8. R-X + NaI R-I + NaX. This reaction is known as

    9. Give reason: Acetic acid is soluble in water.

    10. Among the following which is a fat soluble vitamin Vitamin-B12, Vitamin-C, Vitamin-D.

    PART-B

    II.Answer any FIVE of the following. (Each question carries 2 marks) 5x2=10 11. Give two differences between p-type & n-type semiconductors.

    12. What is limiting molar conductivity? Represent graphically the variation in molar

    conductivity with concentration for acetic acid.

    t

    ln[R]

    ln[R]0

    k = - slope

    0

    Dry Acetone

    NO(g)

  • 13. Rate constant of a first order reaction is 6.93X10-3 min-1. Calculate the half-life period.

    14. i) What is actinide contraction? ii) Which is the common oxidation state exhibited by actinides? 15. How do you prepare diethyl ether by dehydration of ethanol? 16. How do you convert benzamide to benzoic acid?

    17. Give one example each for i) Tranquilizer ii) Antiseptic.

    18. What is saponification with an example. PART-C

    III. Answer any FIVE of the following. (Each question carries 3 marks) 5x3=15 19. How copper is refined by electrolytic method. 3 20. i) Write the structure & mention basicity of hypo phosphorous acid. 2 ii) Which gas is liberated when zinc reacts with dil HNO3? 1 21. Draw the flow chart for the manufacture of sulphuric acid by Contact process. Name the catalyst used in the process 3 22. i)Give any two reasons for the anomalous behaviour of fluorine 2 ii)Give one example of interhalogen compounds 1 23. What are interstitial compounds? 1 Write any two characteristics of interstitial compounds 2 24. i) Write the two chemical equations to show the inter conversion of chromates & dichromates in aqueous solution 2 ii)Complete the equation : 5C2O42- + 2MnO4- + 16H+ 1

    25. With the help of valence bond theory account for the geometry & magnetic property of [Co(NH3)6]3+ 3 26. i)What is an ambidentate ligand? 1 Name the type of structural isomerism that arises in the co-ordination compound containing such a ligand 1 ii) Give the IUPAC name of K2[Zn(OH)4] 1

    PART-D

    IV. Answer any FIVE of the following. (Each question carries 3 marks) 3x5=15 27. a) Calculate the packing efficiency in a CCP crystal lattice 4 b) What is the number of particles per unit cell of a simple cube. 1 28. a) Calculate the osmatic pressure of 0.05% urea solution in water at 200c. Given R =0.0821Latm mol-1K-1. Molar mass of urea = 60g mol-1 3 b) Give two general characteristics of an ideal solution of two liquids 2 29.a)Calculate the emf of the cell in which the following reaction takes place Ni(S)+2Ag+(0.002M) Ni2+(0.160M) + 2Ag(S), Given that E0Cell = 1.05V 3 b) A galvanic cell after use is recharged by passing current through it. What type of cell is it? Give an example 2 30.a) Rate constant of a reaction at 300K & 400K are 0.034S-1& 0.136S-1 respectively. Calculate the activation energy for the reaction [ Given: R = 8.314JK-1mol-1] 3

  • b) Derive the expression for half-life of zero order reaction 2 31. a) Mention two applications of adsorption 2 b) What are emulsions? Give an example for O/W emulsion 2 c) What is the cause for Brownian movement? 1

    V. Answer any FIVE of the following. (Each question carries 3 marks) 4x5=20 32. a) Explain SN2 mechanism with an example 2 b) Name the product formed when chloromethane reacts with (i)aqueous KOH & (ii)alcoholicAgCN 2 c) Give an example of polyhalogen compound 1 33. a) Explain esterification reaction between acetic acid & ethyl alcohol as example 2 b) Boiling point of alcohol is greater than the boiling point of hydrocarbons of comparable molar masses, Why? 1 c) What is the effect of NO2 group on the acidic strength of phenol? Give reason 2 34. a) Explain Etard reaction 2 b) Name the products A & B in the following reaction 2 2CH3CHO c) Name the reagent used in the decarboxyaltion of carboxylic acid 1 35. a) How do you convert benzene diazonium chloride into chlorobenzene. Name the reaction 3 b)Explain Hoffmann Bromamide reaction with an example 2 36. a) Write the Haworth structure of maltose 2 b) What are hormones? Give one biological function of insulin 2 c) What are nucleosides? 1 37. a) Name the monomers of Nylon-6,6 2 b) How is Neoprene prepared? Give equation 2 c) Give an example for thermoplastic polymer. 1

    dilNaOH

    H2O A B

  • Scheme of valuation for model question paper 3 (ZIET) Note : Any other correct alternative answers can be honored wherever applicable Q.No Value points Marks

    I PART-A 1 Decreases 1 2 External pressure to be applied on the solution side just to stop the flow solvent from its

    side to solution side across SPM 1

    3 1M or 1 Molar 1 4 First order 1 5 Homogenous 1 6 Sodium cyanide or NaCN 1 7 Radon or Rn 1 8 Finkelstein reaction 1 9 Due to the formation of hydrogen bond (H-bond) b/w acetic acid molecules & water 1

    10 Vitamin-D 1

    II PART-B

    11

    p-type n-type 1. Doped with trivalent atoms(B,Al) 1. Doped with pentavalent atoms(P,As,Sb) 2. Negative charges (electrons) contributes to conduction

    2. Holes contributes to conduction

    2

    12 Molar conductivity at infinite dilution

    1

    1

    13

    t1/2 =.

    t1/2 =..

    t1/2 = 100 min

    1

    1

    14 (i)The steady decrease in atomic size of the actinides with increase in the atomic number (ii)+3

    1

    1

    m

  • 15 When ethanol is heated with Con H2SO4 at 414K, diethyl ether is formed CH3CH2OH CH3CH2OCH2CH3

    OR Self explanatory equation

    1

    1

    OR

    2

    16 When benzamide is heated with dil acid hydrolysis takes place to form benzoic acid

    OR

    Self explanatory equation

    1

    1

    OR

    2

    17 (i) Noradrenaline OR Equanil OR Chlordiazepoxide OR Meprobamate OR Any other suitable example (ii) Dettol OR Chloroxylenol OR Tincture of iodine OR Terpineol OR Furacine OR Soframicine OR Any other suitable example

    1

    1 18 When fat is heated with aqueous NaOH solution, soap is formed

    OR Self explanatory equation

    1

    1

    OR

    2

    III PART-C 19 Impure copper is made as anode & thin sheet of pure copper is made as cathode. Acidified

    copper sulphate solution is taken as electrolyte On passing electric current, pure copper deposits on the cathode At anode : Cu Cu2+ + 2e At cathode : Cu2+ + 2e Cu

    1

    1 1

    20 (i)

    1

    H2SO4 413K

    CONH2 H3O+

    COOH

    O l l

    + 3NaOH

    CH2 O C C17H35 O l l

    CH O C C17H35

    CH2 O C C17H35 O l l

    3C17H35COONa +

    CH2 OH

    CH OH

    CH2 OH

    OH

    O

    P l l

    H H

  • Basicity = 1 (ii) Nitrous oxide OR N2O

    1

    1 21

    (ii) Vanadium pentoxide

    2

    1 22 (i) Smallest size, Highest electronegativity, Non availability of d-orbitals, High ionization

    enthalpy, low F-F bond dissociation enthalpy (any two) (ii) ClF3, ICl, BrF5 OR any other suitable example

    2

    1

    23 The compounds formed by the trapping of small atoms like H, C, N etc into the crystal lattice of metals Characteristics

    1. High m.p. than the pure metal 2. Very hard 3. Chemically inert 4. Retain metallic conductivity

    (any two)

    1

    2

    24 2CrO42- + 2H+ Cr2O72- + H2O Cr2O72- + 2OH- 2CrO42- + H2O 2Mn2+ + 8H2O + 10CO2

    1 1

    1

    25

    E C of Co3+ = 3d6 or d2sp3 hybridized orbitals of Co3+ [Co(NH3)6]3+ Geometry : Octahedral Magnetic property : Diamagnetic

    1

    1

    1

    3d 4s 4p

    3d 6 pairs of electrons from 6 NH3

    Air Washing & Cooling Tower

    Drying Tower

    Sulphur Burner

    Dust Precipitator

    Oleum

    Arsenic purifier

    Pre Heater

    Absorption Tower

    Catalytic Converter

  • 26 (i) Ligands which can ligate through two different atoms OR Uni dentate ligands have more

    than one donar atom OR Any other correct stateemnt Linkage isomerism (ii)Potassium tetrahydroxidozincate(II)

    1

    1

    1

    IV PART-D 27

    a)

    Let a is the edge length of the cube,

    a =2 2ar

    Each unit cell in hcp has effectively 4 spheres. Total volume of four sphere is equal to 4 X

    (4/3) r3 and volume of the cube is a3 or (22ar)3

    Packing efficiency =

    Packing efficiency = () %

    = 74%

    b)1 or One

    1

    1

    1

    1

    1

    28

    a) =

    =..

    = 0.2atm b) 1.Obeys Raoults law 2. H of mixing is zero 3. V of mixing is zero 4. Does not forms azeotropic mixtures 5. (A-B) interactions are same as that of (A-A) or (B-B) interactions

    1

    1

    1

  • 6. Measured VP = VP predicted by Raoults law (Any two)

    2

    29

    a) = - . log [ ][]

    = 1.05 - . log .(.)

    = 0.914V b) Secondary cell Example : Lead-storage battery or Nicad storage cell or any other example (Any one)

    1

    1

    1

    1 1

    30

    a) log = . or Ea = . log

    Ea =.. ..

    = 13834Jmol-1 or 13.8KJmol-1

    b) W K T rate constant (k) expression for zero order reaction

    k = or t =

    When t = t1/2, [R] =

    t1/2 = = =

    1

    1

    1

    1

    1

    31

    a) In gas mask or Control of humidity or Removal of colouring matter from solutions or Production of high vaccum or In heterogeneous catalysis or Separation of inert gases or In curing diseases or In froth floatation process or Adsorption indicators or In chromatographic analysis ( any two) b) Liquid-Liquid colloidal system OR dispersion of finely divided droplets in another liquid OR

    2

    1

  • Any other suitable definition Example : Milk, vanishing cream or any other suitable example c) Due to the collision of the dispersed phase particles with molecules of the dispersion medium.

    1

    1

    V PART-D 32 a)

    b) (i) Methanol or Methyl alcohol (ii) Methyl carbylamine or N-Methyl carbylamine or Methyl isocyanide or Isocyanomethane or Methyl isonitrile c) CH2Cl2 or CHCl3 or CCl4 or Freons or DDT or any other suitable example

    1

    1

    1 1

    1 33 a) When acetic acid is heated with ethyl alcohol in the presence of Con H2SO4 as dehydrating

    agent, ethyl acetate is formed. CH3COOH + C2H5OH CH3COOC2H5 + H2O

    OR

    Self explanatory equation b) H-bonding c) Increases Since NO2 is electron withdrawing group OR Due to I effect

    1

    1

    OR

    2

    1

    1 1

    34 a) When toluene treated with CrO2Cl2& CS2, followed by hydrolysis benzaldehyde is formed.

    OR

    1

    1

    OR

    OH + HO C Cl

    H

    H

    H

    l H

    H C Cl l H

    H

    l H

    HO C H + Cl l

    Con H2SO4

    CH3 l H

    C = O

    1.CrO2Cl2/CS2

    2. H2O

  • Self explanatory equation b) A = Aldol or 3-hydroxybutanal B = Chrotanaldehyde or But-2-enal c) Sodalime

    2

    1 1

    1

    35 a) When benzene diazonium chloride reacts with Cuprous chloride in HCl, chlorobenzene is formed

    OR

    Self explanatory equation

    Name of the reaction : Sandmeyers reaction

    OR

    a) When benzene diazonium chloride reacts with Copper in the presence of HCl, chlorobenzene is formed

    OR Self explanatory equation

    Name of the reaction : Gatterman reaction

    b) When amide reacts with bromine in the presence of aqueous/alcoholic NaOH, primary amine is formed.

    R-CONH2 + Br2 + 4NaOH R-NH2 + Na2CO3 + 2NaBr + 2H2O

    OR

    1

    1

    OR

    2

    1

    1

    1

    OR

    2

    1

    1

    1

    OR

    2

    N2Cl

    + Cu2Cl2/HCl

    Cl

    + N2

    Cu/HCl

    N2Cl + Cl

    + N2 + HCl

  • Self explanatory equation OR

    By taking R = CH3 OR C6H5 as example

    36 a)

    b) Biochemical messengers or Chemical substances secreted by endocrine (ductless) glands

    Regulates the blood sugar level

    c) Pentose sugar + Nitrogen base

    2

    1

    1

    1

    37 a) Hexamethylenediamine

    Adipic acid

    b) Neoprene is formed by the free radical polymerization of chloroprene

    c) Polyethylene or PVC or Polystyrene or Polyvinyls or any other suitable example

    (any one)

    1 1

    1

    1

    1

    O H

    OH H

    H

    OH

    O H

    OH

    CH2OH

    H O H

    OH

    CH2OH

    H

    OH H

    H

    OH

    H

    n CH2 = C CH = CH2 l

    Cl

    n

    l Cl

    CH2 C = CH CH2

  • II-PUC CHEMISTRY

    BLUE PRINT FOR MODEL QUESTION PAPER - 4

    Group Unit Title Hours Marks Part-A

    I

    10x1 mark

    Part B

    II

    8x2 mark

    Part C

    III

    8x3 mark

    Part D

    IV & V 11x5 mark

    Total

    Group-I Physical

    1 The Solid state 8 7 11 27 7

    2 Solution 9 8 1,2 28 7

    3 Electrochemistry 9 8 3 12 29 8

    4 Chemical kinetics 9 8 4 13 30 8

    5 Surface chemistry 6 5 5 31 6

    Total of Group-I 41 36 36

    Group-II Inorganic

    6 General principles and processes of isolation of elements

    5 4 6 19 4

    7 The p-block elements 11 10 7 20,21,22 10

    8 The d and f-block elements 9 8 14 23,24 8

    9 Coordination compounds 7 6 25,26 6

    Total of Group-II 32 28 28

    Group-III Organic

    10 Haloalkanes and haloarenes 7 6 8 32 6

    11 Alcohols, phenols and ethers 8 7 15 33 7

  • 12 Aldehydes, ketones and carboxylic acids 9 8 9 16 34 8

    13 Amines 6 5 35 5

    14 Biomolecules 7 6 10 36 6

    15 Polymers 5 5 37 5

    16 Chemistry in everyday life 5 4 17,18 4

    Total of Group-III 47 41 41

    TOTAL 120 105 10 10 15 35 105

  • CHEMISTRY ( 34) NEW SCHEME

    MODEL QUESTION PAPER NO.4

    TIME 3HOURS 15 MINUTES MAX.MARKS.70

    Instructions :

    i. The question paper has four parts. All the four parts are compulsory

    ii. PART A carries 10 marks , each question carries one marks.

    PART-B carries 10 marks . each question carries two marks

    PARRT C carries 15 marks . each question carries three marks

    PART-D carries 35 marks . each question carries five marks

    iii) write balanced chemical equations and draw diagrams wherever necessary

    iv) use log table and simple calculators if necessary

    (use of scientific calculator is not allowed)

    PART-A

    I ANSWER ALL THE QUESTIONS. EACH QUESTION CARRIES ONE MARK 1X10=10

    1. Define VantHaffs factor. 2. What are isotonic solutions ? 3. Mention the S.I unit for molar conductivity. 4. For the reaction A+B products .the rate becomes doubled when concentraon of only A is

    increased by two times, the rate is increased by four times, when the concentration of B alone is doubled what is the order of the reaction?

    5. Name the enzyme used in the inversion of cane sugar 6. Name the method used for refining of Zirconium. 7. Complete the reaction XeF4+O2F2 A+O2 Identify A 8. What is a Recemic mixture-? 9. Name the product obtained when acetaldehyde reacts with Hydroxyl amine. 10. Name the nitrogenous base present in RNA only.

    PART-B II ANSWER ANY FIVE OF THE FOLLOWING EACH QUESTION CARRIES TWO MARKS. 5X2=10 MARKS

    11. Silver forms CCP lattice and x-ray studies of its crystals show that the edge length of its unit cell is 408.6 pm . calculate the density of silver ( Atomic mass of Ag= 107.9u)

    12. What is corrosion? Mention a general method to prevent it. 13. Write the Arrhenius equation and mention what each term stands for. 14. Any two differences between lanthanides and Actinides.

  • 15. How does Acetyl chloride react with Anisol in presence of anhydrous aluminum chloride catalyst. Write the chemical equation of the reaction.

    16. What are the effects of the electron withdrawing and electron donating groups on acidity of carboxylic acids

    17. What are antacids? Give an example. 18. What are food preservatives ? Give one example

    PART C

    III ANSWER ANY FIVE OF THE FOLLOWING EACH QUESTION CARRIES THREE MARKS 5X3= 15

    19. How is pure alumina obtained from Bauxite by leaching process? 20. Write the reactions that takes place during the manufacture of nitric acid by Ostwalds process. 21. i) what happens when potassium chlorate is heated in presence of MnO2. write the equation for

    the reaction also ii) draw the structure of sulphuric acid.

    22. i) How is chlorine prepared by using MnO2 ? ii) complete the reaction NH3+Cl2(excess)

    23. d-block elements form co-ordination compounds . Give reasons. 24. How is potassium dichromate prepared from the chromite ore? 25. Mention the geometry, magnetic property and type of hybridization in [Ni(cn)4]2- complex. 26. Write any three postulates of Werners theory of complexes.

    PART-D

    IV ANSWER ANY THREE OF THE FOLLOWING . EACH QUESTION CARRIES FIVE MARKS 3X5= 15

    27. a. calculate the packing efficiency in body centered cubic crystals (3) b. calculate the number of particles per unit cells in f.c.c. (2)

    28. a. the boiling point of benzene is 353.23K .when 1.80 g of a non volatile , non

    electrolytic solute was dissolved in 90 g of benzene , the boiling point was

    raised to 354.11 K calculate the molar mass of the solute [ Kb for benzene =2.53K.kg mol-1] (3)

    b. write two differences between ideal and non ideal solutions of two liquids (2)

    29. a). calculate the standard free energy change for the following reaction occurring in the galvanic cell at 298K

    3Mg(s) + 2Al3+ (aq) 3Mg2+(aq) +2 Al (s)

  • Given EMg2+/Mg = - 2.37 V and EAl3+/Al=-1.66V (4)

    b. what is primary battery?

    30. a. Derive the integrated rate equation for the rate constant of a first order reaction (4)

    b. what is pseudo first order reaction ? (1)

    31. a. complete and balance the following reactions

    SO2 + H2 S oxidation

    FeCl3 + H2O hydrolysis (2)

    b. Mention two characteristics of enzyme catalysis (2)

    c. What is the sign of S for the adsorption of gas on solids ?

    V ANSWER ANY FOUR OF THE FOLLOWING . EACH QUESTION CARRIES FIVE MARKS

    4X5=20

    32. a. Explain SN1 mechanism by taking tertiary butyl bromide as an example (3)

    b. What is Wurtz Fittings reaction ? Give an example (2)

    33. a. How is phenol manufactured by cumene process. Give the chemical equations of the reaction involved . (3)

    b. How do you prepare ethanol by using the Grignard Reagent? (2)

    34. a. How is Benzol chloride converted into benzaldehyde ? Name the reaction (3)

    b. Write the chemical equation for the reaction between dilute NaOH and acetalhyde, mention the name of the product formed . (2)

    35. a. Explain how is Hinbergs reagent is used to distinguish the primary, secondary and tertiary amines

    b. Write the chemical reactions involved in the conversion of aniline into phenol (2)

    36. a. What are carbohydrates ?and how are they classified ? (3)

    b. What is a peptide bond ? How many peptide bonds are present

    in a tetra peptide ? (2)

  • 37. a. i) what are condensation polymers ? Give an example.

    ii)Give the IUPAC name of the monomer of natural rubber. (3)

    b. What are Biodegradable polymers ? Give an example (2)

  • Scheme of Valuation

    Q.NO

    VALUE POINT MARKS

    1

    1

    2 Two solutions having same osmotic pressure at a given temperature 1

    3 Sm2 mol-1 or Scm2 mol-1 1

    4 Two 1

    5 Invertase 1

    6 Van Arkel method 1

    7 A=XeF6 or Xenonhexaflouride 1

    8 A mixture containing two enantiomers in equal proportions will have zero optical rotation.

    1

    9 Acetaldoxime 1

    10 Uracil 1

    PART -B

    11 Formula d=zM -------- a3 NA substitution with correct answer(10.5 x 103 kgm-3) OR

    10.5 g cm-3

    1

    1

    12 A metal is oxidized by loss of es and formation of oxides

    Any one method of prevention of corrosion ( coating, painting, tinning, cathodic

    1

  • protection) 1

    13 Arrhenins Equation k=A.e-Ea/RT OR log ek=logeA Ea ---- RT Where k= rate constant, A=Arrhenius constant Ea= Activation energy, T= temperature, R= gas constant (any one)

    1

    1

    14 Lanthanides

    1.Binding energies of 4f es are higher

    2. They do not form complexes easily

    ANY ONE SUITABLE ANSWER

    Actinides

    1. Binding energies of 5f es are

    Lower

    2. They have tendency to form

    complexes

    1

    1

    15

    2

    16 Electron with drawing group increases acidic strength

    Electron donating group decreases acidic strength

    1

    1

    17 Chemical substances which are used in the treatment of acidity

    Ranitidine( (Zantac) OR ANY OTHER EXAMPLE

    1

    1

    18 Chemical substances which prevent spoilage of food due to microbial growth 1

  • Ex: Table salt, sugar, vegetable oils, OR any other suitable example 1

    PART-C

    19 Al2O3 + 2 NaOH + 3H2O 2Na [ Al (OH)4]

    2Na[Al(OH)4 + CO2 Al2O3. x H2O + 2NaHCO3

    Al2O3. x H2O 1470k Al2O3. +x H2O.

    Each equation carries one mark OR COMPLETE EXPLANATION IN THREE STEPS

    3

    20 4NH3+ 5O2 Pt/Rh 4NO + 6H2O

    500k,9bar

    2NO + O2 2NO2

    3NO2 +H2O 2HNO3 + NO

    OR COMPLETE EXPLANATION IN THREE STEPS

    1

    1

    1

    21 (i) Statement 2KClO3 Mno2 2KCl + 3O2

    OR SELF EXPLANATION ON REACTION

    1

    1

    1

    22 (i) Heating MnO2 with conc. HCl MnO2 + 4 HCl MnCl2 + Cl2+ 2H2O OR Self explanation on reaction\

    1

    1

  • (ii) NH3 + Cl2(excess) NCl3 + 3HCl

    2

    1

    23 Small size of metal ions

    High ionic charges

    Availability of d- orbitals

    1

    1

    1

    24 4FeCr2O4 + 8Na2CO3 7O2 8 Na2CrO4 + 2Fe2O3 +8CO2

    2Na2CrO4 +2H+ Na2CrO7 + 2Na++H2O

    Na2CrO7 +2KClK2Cr2O7 +2NaCl

    OR COMPLETE EXPLANATION IN THREE STEPS

    1

    1

    1

    25 Square planner complex

    Diamagnetic

    dsp2 Hybridisation

    1

    1

    1

    26 (i) Coordination compounds metals show two types of valencies primary and secondary

    (ii) Primary valencies are ionisable (iii) Secondary valencies are non-ionisable

    OR ANY OTHER POSTULATES

    1

    1

    1

    PART -D

    27 (a) Up to a = 4/3 OR r= Packaing efficiency= volume offupied by 2 spheres x 100 % Total volume of unit cell Substitution and correct answer (68%)

    (b) Total no. of particles due to corners 1/8x8=1 Total no.of particles due to faces 6x = 3 & Total no.of particles per unit cell 3+1 = 4

    1

    1

  • 1

    28 (a) Formula : M2 = 1000x W2 x Kb

    1 Substitution:

    M2 = 1000 x 1.8 x 2.53

    0.88 x 90

    M2 = 58 g mol-1

    [ NO UNIT DEDUCT ONE MARK]

    (c) Ideal solution non ideal solution Hmix =0 Hmix O

    Vmix =0 Vmix O

    OR ANY OTHER DIFFERENCES

    1

    1

    29 (a) E cell = ER --- EL = -- 1.66+ 2.37 = 0.71 V G = -- nF E cell = -- 6x96500x 0.71 = - 411090 J OR - 411.09kJ

    (b) Battery can not be reused

    1

    1

    1

    1

    30 (a) RP Rate = - d[R] = k[R] OR dt d[R] = - kdt [R] Integrating euation Ln[R] = -kt+I --------------------(1) To calculate I : T=o, R=[R]0

  • ln[R]o =-kxo+I OR ln[R]0=I substitutionequation (1) ln [R] = -kt + ln [R]0 Rearranging Ln[R] = - kt OR [R]0 K= 1/t. ln [R]0 OR [R] K= 2.303 log10 [R]0 t [R]

    (b) Order of reaction is one and molecularity is two or more than two

    1

    1

    1

    1

    1

    1

    31 (a) i. SO2 + 2H2S doubel decomposition AS2 S3 +3H2O

    FeCl3 + 3H2O Hydrolysis Fe(OH)3 + 3HCl.

    (b) Characteristics are (i) Highly efficient (ii) Highly specific in nature

    OR ANY OTHER REVELENT CHARACTERISTIC (FOR EACH ONE MARK)

    (c) S decreases OR S is negative

    1

    1

  • 1

    PART-V

    32 (a) Step-1

    (CH3)3 CBr slow + Br -

    Step-2

    +OH - fast (CH3)3 COH Mentioning first order kinetics

    (b) Alkylhalide reacts with anyl halide gives alkylarenes when treated with sodium indry ether

    OR self-explanation with equation

    1

    1

    1

    1

    1

  • 2

    33 (a) Explanation

    OR Step wise reaction carries

    (b) HCHO+ CH3 Mg Br CH3CH2OBr Methanal CH3CH2OMgBr + HOH CH3CH2OH+Mg(OH)Br Ethanol

    2

    3

    34

    (a) H2 Benzoyl Pd-BaSO4 chloride Benzaldehyde Rosenmund reduction

    (b) 2CH3CHO dil NaOH CH3-CH-CH2CHO CH3-CH=CH-CHO OH

    Ethanal 3-Hydroxybutanal But-2 enal (ALDOL)

    2

    1

  • 2

    35 (a) Hinsbergd reagent reacts with 1 amine gives a product which is soluble in alkali

    (b) Hinsbergs reagent reacts with 2 amine gives a product which is insoluble in alkali Hinsbergs reagemt doesnot react with 3 amine C6H5NH2 + NaNO2+2HCl 273-278 k C6H5N2+Cl- + NaCl + 2H2O C6H5N2+Cl- + H2OC6H5OH + N2 + HCl

    1

    1

    1

    1

    1

    36 (a) Optically active polyhydroxy aldehydes or ketones or the compounds which produce such units on hydrolysis Classified as monosaccharides, oligo saccharides, polysaccharides

    (b) Elimination of a water molecule from two molecules of similar or different amino acids and formation of CONH- bond 3 peptide bond

    1

    2

    1

    1

    37 (a) i. condensation reaction between two different bifunctional or trifunctional monomeric units Nylon6,6 or Any other example ii. isoperene or 2-methyl-1,3-butadiene

    (b) polymers cause acute environmental problems and remain undegraded for long time Nylon-2-nylon-6 or any other example

    1

    1

    1

    1

  • II-PUC CHEMISTRY

    BLUE PRINT FOR MODEL QUESTION PAPER - 4

    Group Unit Title Hours Marks Part-A

    I

    10x1 mark

    Part B

    II

    8x2 mark

    Part C

    III

    8x3 mark

    Part D

    IV & V 11x5 mark

    Total

    Group-I Physical

    1 The Solid state 8 7 11 27 7

    2 Solution 9 8 1,2 28 7

    3 Electrochemistry 9 8 3 12 29 8

    4 Chemical kinetics 9 8 4 13 30 8

    5 Surface chemistry 6 5 5 31 6

    Total of Group-I 41 36 36

    Group-II Inorganic

    6 General principles and processes of isolation of elements

    5 4 6 19 4

    7 The p-block elements 11 10 7 20,21,22 10

    8 The d and f-block elements 9 8 14 23,24 8

    9 Coordination compounds 7 6 25,26 6

    Total of Group-II 32 28 28

    Group-III Organic

    10 Haloalkanes and haloarenes 7 6 8 32 6

    11 Alcohols, phenols and ethers 8 7 15 33 7

  • 12 Aldehydes, ketones and carboxylic acids 9 8 9 16 34 8

    13 Amines 6 5 35 5

    14 Biomolecules 7 6 10 36 6

    15 Polymers 5 5 37 5

    16 Chemistry in everyday life 5 4 17,18 4

    Total of Group-III 47 41 41

    TOTAL 120 105 10 10 15 35 105

  • CHEMISTRY ( 34) NEW SCHEME

    MODEL QUESTION PAPER NO.4

    TIME 3HOURS 15 MINUTES MAX.MARKS.70

    Instructions :

    i. The question paper has four parts. All the four parts are compulsory

    ii. PART A carries 10 marks , each question carries one marks.

    PART-B carries 10 marks . each question carries two marks

    PARRT C carries 15 marks . each question carries three marks

    PART-D carries 35 marks . each question carries five marks

    iii) write balanced chemical equations and draw diagrams wherever necessary

    iv) use log table and simple calculators if necessary

    (use of scientific calculator is not allowed)

    PART-A

    I ANSWER ALL THE QUESTIONS. EACH QUESTION CARRIES ONE MARK 1X10=10

    1. Define VantHaffs factor. 2. What are isotonic solutions ? 3. Mention the S.I unit for molar conductivity. 4. For the reaction A+B products .the rate becomes doubled when concentraon of only A is

    increased by two times, the rate is increased by four times, when the concentration of B alone is doubled what is the order of the reaction?

    5. Name the enzyme used in the inversion of cane sugar 6. Name the method used for refining of Zirconium. 7. Complete the reaction XeF4+O2F2 A+O2 Identify A 8. What is a Recemic mixture-? 9. Name the product obtained when acetaldehyde reacts with Hydroxyl amine. 10. Name the nitrogenous base present in RNA only.

    PART-B II ANSWER ANY FIVE OF THE FOLLOWING EACH QUESTION CARRIES TWO MARKS. 5X2=10 MARKS

    11. Silver forms CCP lattice and x-ray studies of its crystals show that the edge length of its unit cell is 408.6 pm . calculate the density of silver ( Atomic mass of Ag= 107.9u)

    12. What is corrosion? Mention a general method to prevent it. 13. Write the Arrhenius equation and mention what each term stands for. 14. Any two differences between lanthanides and Actinides.

  • 15. How does Acetyl chloride react with Anisol in presence of anhydrous aluminum chloride catalyst. Write the chemical equation of the reaction.

    16. What are the effects of the electron withdrawing and electron donating groups on acidity of carboxylic acids

    17. What are antacids? Give an example. 18. What are food preservatives ? Give one example

    PART C

    III ANSWER ANY FIVE OF THE FOLLOWING EACH QUESTION CARRIES THREE MARKS 5X3= 15

    19. How is pure alumina obtained from Bauxite by leaching process? 20. Write the reactions that takes place during the manufacture of nitric acid by Ostwalds process. 21. i) what happens when potassium chlorate is heated in presence of MnO2. write the equation for

    the reaction also ii) draw the structure of sulphuric acid.

    22. i) How is chlorine prepared by using MnO2 ? ii) complete the reaction NH3+Cl2(excess)

    23. d-block elements form co-ordination compounds . Give reasons. 24. How is potassium dichromate prepared from the chromite ore? 25. Mention the geometry, magnetic property and type of hybridization in [Ni(cn)4]2- complex. 26. Write any three postulates of Werners theory of complexes.

    PART-D

    IV ANSWER ANY THREE OF THE FOLLOWING . EACH QUESTION CARRIES FIVE MARKS 3X5= 15

    27. a. calculate the packing efficiency in body centered cubic crystals (3) b. calculate the number of particles per unit cells in f.c.c. (2)

    28. a. the boiling point of benzene is 353.23K .when 1.80 g of a non volatile , non

    electrolytic solute was dissolved in 90 g of benzene , the boiling point was

    raised to 354.11 K calculate the molar mass of the solute [ Kb for benzene =2.53K.kg mol-1] (3)

    b. write two differences between ideal and non ideal solutions of two liquids (2)

    29. a). calculate the standard free energy change for the following reaction occurring in the galvanic cell at 298K

    3Mg(s) + 2Al3+ (aq) 3Mg2+(aq) +2 Al (s)

  • Given EMg2+/Mg = - 2.37 V and EAl3+/Al=-1.66V (4)

    b. what is primary battery?

    30. a. Derive the integrated rate equation for the rate constant of a first order reaction (4)

    b. what is pseudo first order reaction ? (1)

    31. a. complete and balance the following reactions

    SO2 + H2 S oxidation

    FeCl3 + H2O hydrolysis (2)

    b. Mention two characteristics of enzyme catalysis (2)

    c. What is the sign of S for the adsorption of gas on solids ?

    V ANSWER ANY FOUR OF THE FOLLOWING . EACH QUESTION CARRIES FIVE MARKS

    4X5=20

    32. a. Explain SN1 mechanism by taking tertiary butyl bromide as an example (3)

    b. What is Wurtz Fittings reaction ? Give an example (2)

    33. a. How is phenol manufactured by cumene process. Give the chemical equations of the reaction involved . (3)

    b. How do you prepare ethanol by using the Grignard Reagent? (2)

    34. a. How is Benzol chloride converted into benzaldehyde ? Name the reaction (3)

    b. Write the chemical equation for the reaction between dilute NaOH and acetalhyde, mention the name of the product formed . (2)

    35. a. Explain how is Hinbergs reagent is used to distinguish the primary, secondary and tertiary amines

    b. Write the chemical reactions involved in the conversion of aniline into phenol (2)

    36. a. What are carbohydrates ?and how are they classified ? (3)

    b. What is a peptide bond ? How many peptide bonds are present

    in a tetra peptide ? (2)

  • 37. a. i) what are condensation polymers ? Give an example.

    ii)Give the IUPAC name of the monomer of natural rubber. (3)

    b. What are Biodegradable polymers ? Give an example (2)

  • Scheme of Valuation

    Q.NO

    VALUE POINT MARKS

    1

    1

    2 Two solutions having same osmotic pressure at a given temperature 1

    3 Sm2 mol-1 or Scm2 mol-1 1

    4 Two 1

    5 Invertase 1

    6 Van Arkel method 1

    7 A=XeF6 or Xenonhexaflouride 1

    8 A mixture containing two enantiomers in equal proportions will have zero optical rotation.

    1

    9 Acetaldoxime 1

    10 Uracil 1

    PART -B

    11 Formula d=zM -------- a3 NA substitution with correct answer(10.5 x 103 kgm-3) OR

    10.5 g cm-3

    1

    1

    12 A metal is oxidized by loss of es and formation of oxides

    Any one method of prevention of corrosion ( coating, painting, tinning, cathodic

    1

  • protection) 1

    13 Arrhenins Equation k=A.e-Ea/RT OR log ek=logeA Ea ---- RT Where k= rate constant, A=Arrhenius constant Ea= Activation energy, T= temperature, R= gas constant (any one)

    1

    1

    14 Lanthanides

    1.Binding energies of 4f es are higher

    2. They do not form complexes easily

    ANY ONE SUITABLE ANSWER

    Actinides

    1. Binding energies of 5f es are

    Lower

    2. They have tendency to form

    complexes

    1

    1

    15

    2

    16 Electron with drawing group increases acidic strength

    Electron donating group decreases acidic strength

    1

    1

    17 Chemical substances which are used in the treatment of acidity

    Ranitidine( (Zantac) OR ANY OTHER EXAMPLE

    1

    1

    18 Chemical substances which prevent spoilage of food due to microbial growth 1

  • Ex: Table salt, sugar, vegetable oils, OR any other suitable example 1

    PART-C

    19 Al2O3 + 2 NaOH + 3H2O 2Na [ Al (OH)4]

    2Na[Al(OH)4 + CO2 Al2O3. x H2O + 2NaHCO3

    Al2O3. x H2O 1470k Al2O3. +x H2O.

    Each equation carries one mark OR COMPLETE EXPLANATION IN THREE STEPS

    3

    20 4NH3+ 5O2 Pt/Rh 4NO + 6H2O

    500k,9bar

    2NO + O2 2NO2

    3NO2 +H2O 2HNO3 + NO

    OR COMPLETE EXPLANATION IN THREE STEPS

    1

    1

    1

    21 (i) Statement 2KClO3 Mno2 2KCl + 3O2

    OR SELF EXPLANATION ON REACTION

    1

    1

    1

    22 (i) Heating MnO2 with conc. HCl MnO2 + 4 HCl MnCl2 + Cl2+ 2H2O OR Self explanation on reaction\

    1

    1

  • (ii) NH3 + Cl2(excess) NCl3 + 3HCl

    2

    1

    23 Small size of metal ions

    High ionic charges

    Availability of d- orbitals

    1

    1

    1

    24 4FeCr2O4 + 8Na2CO3 7O2 8 Na2CrO4 + 2Fe2O3 +8CO2

    2Na2CrO4 +2H+ Na2CrO7 + 2Na++H2O

    Na2CrO7 +2KClK2Cr2O7 +2NaCl

    OR COMPLETE EXPLANATION IN THREE STEPS

    1

    1

    1

    25 Square planner complex

    Diamagnetic

    dsp2 Hybridisation

    1

    1

    1

    26 (i) Coordination compounds metals show two types of valencies primary and secondary

    (ii) Primary valencies are ionisable (iii) Secondary valencies are non-ionisable

    OR ANY OTHER POSTULATES

    1

    1

    1

    PART -D

    27 (a) Up to a = 4/3 OR r= Packaing efficiency= volume offupied by 2 spheres x 100 % Total volume of unit cell Substitution and correct answer (68%)

    (b) Total no. of particles due to corners 1/8x8=1 Total no.of particles due to faces 6x = 3 & Total no.of particles per unit cell 3+1 = 4

    1

    1

  • 1

    28 (a) Formula : M2 = 1000x W2 x Kb

    1 Substitution:

    M2 = 1000 x 1.8 x 2.53

    0.88 x 90

    M2 = 58 g mol-1

    [ NO UNIT DEDUCT ONE MARK]

    (c) Ideal solution non ideal solution Hmix =0 Hmix O

    Vmix =0 Vmix O

    OR ANY OTHER DIFFERENCES

    1

    1

    29 (a) E cell = ER --- EL = -- 1.66+ 2.37 = 0.71 V G = -- nF E cell = -- 6x96500x 0.71 = - 411090 J OR - 411.09kJ

    (b) Battery can not be reused

    1

    1

    1

    1

    30 (a) RP Rate = - d[R] = k[R] OR dt d[R] = - kdt [R] Integrating euation Ln[R] = -kt+I --------------------(1) To calculate I : T=o, R=[R]0

  • ln[R]o =-kxo+I OR ln[R]0=I substitutionequation (1) ln [R] = -kt + ln [R]0 Rearranging Ln[R] = - kt OR [R]0 K= 1/t. ln [R]0 OR [R] K= 2.303 log10 [R]0 t [R]

    (b) Order of reaction is one and molecularity is two or more than two

    1

    1

    1

    1

    1

    1

    31 (a) i. SO2 + 2H2S doubel decomposition AS2 S3 +3H2O

    FeCl3 + 3H2O Hydrolysis Fe(OH)3 + 3HCl.

    (b) Characteristics are (i) Highly efficient (ii) Highly specific in nature

    OR ANY OTHER REVELENT CHARACTERISTIC (FOR EACH ONE MARK)

    (c) S decreases OR S is negative

    1

    1

  • 1

    PART-V

    32 (a) Step-1

    (CH3)3 CBr slow + Br -

    Step-2

    +OH - fast (CH3)3 COH Mentioning first order kinetics

    (b) Alkylhalide reacts with anyl halide gives alkylarenes when treated with sodium indry ether

    OR self-explanation with equation

    1

    1

    1

    1

    1

  • 2

    33 (a) Explanation

    OR Step wise reaction carries

    (b) HCHO+ CH3 Mg Br CH3CH2OBr Methanal CH3CH2OMgBr + HOH CH3CH2OH+Mg(OH)Br Ethanol

    2

    3

    34

    (a) H2 Benzoyl Pd-BaSO4 chloride Benzaldehyde Rosenmund reduction

    (b) 2CH3CHO dil NaOH CH3-CH-CH2CHO CH3-CH=CH-CHO OH

    Ethanal 3-Hydroxybutanal But-2 enal (ALDOL)

    2

    1

  • 2

    35 (a) Hinsbergd reagent reacts with 1 amine gives a product which is soluble in alkali

    (b) Hinsbergs reagent reacts with 2 amine gives a product which is insoluble in alkali Hinsbergs reagemt doesnot react with 3 amine C6H5NH2 + NaNO2+2HCl 273-278 k C6H5N2+Cl- + NaCl + 2H2O C6H5N2+Cl- + H2OC6H5OH + N2 + HCl

    1

    1

    1

    1

    1

    36 (a) Optically active polyhydroxy aldehydes or ketones or the compounds which produce such units on hydrolysis Classified as monosaccharides, oligo saccharides, polysaccharides

    (b) Elimination of a water molecule from two molecules of similar or different amino acids and formation of CONH- bond 3 peptide bond

    1

    2

    1

    1

    37 (a) i. condensation reaction between two different bifunctional or trifunctional monomeric units Nylon6,6 or Any other example ii. isoperene or 2-methyl-1,3-butadiene

    (b) polymers cause acute environmental problems and remain undegraded for long time Nylon-2-nylon-6 or any other example

    1

    1

    1

    1