Chemistry Test 9

P R O F E S S O R S A C A D E M Y

Chemistry Resilience, Seeking True Knowledge & Hard Working is our identity TEST # 2F.SC – Part I Pre-Board Examination Test System/2011 Chem/PAJ/2011Name: Marks:

OBJECTIVE: Tick the correct answer from the given options. (Time: 15 min)

Statements A B C D For a good separation, the two liquids

are gently shaken to increase their area of

Miscibility Separation Contact Solubility

Several types of filter media are used for filtration depending on the

Nature of reactants

Nature of reaction

Nature of precipitate

Nature of filter paper

The ratio of solute in organic phase to that in aqueous phase is called

Equilibrium

coefficient

Equilibrium constant

General constant

Distribution

coefficient

The solid which is left over the filter paper is called

Mother liquor

Crystals Residue Mud

Crystallization does not involve Heating Sublimation Vaporization

Cooling

In solvent extraction, ether is used to separate products of organic synthesis from

Ethyl alcohol water CCl4 CHCl3

At constant pressure qp is equal to ∆H ∆E ∆P ∆S The enthalpy change when 1mole of

gaseous atoms are formed from its element is called enthalpy of

Formation Combustion Atomization Solution

Which of the following is not a state function

Pressure Heat Temperature

Volume

Mathematical form of first law of thermodynamics is

∆E = Q + W

∆H = ∆E+P∆V

Q = ∆E + ∆H

H = E + PV

When enthalpy of reactants is higher than products the reaction will be

Endothermic Exothermic

Spontaneous

Non Spontane

ous

Hess’s law is based uponLaw of

conservation of mass

First law of thermodyna

mics

Second law of

thermodynamics

Borne Haber cycle

SUBJECTIVE (Chapter # 2, 7)

Question # 2. Give the short answers of the following questions. (17 x 2 = 34)i. Why ∆H ≈ ∆E in case of solids and liquids?ii. Differentiate b/w enthalpy and internal energy.iii. Define standard enthalpy of solution.iv. Differentiate b/w stationary and mobile phase.v. Define state function.vi. What is specific heat?vii. What is Rf value? How it control distribution of solute?

viii. Why enthalpy of neutralization of strong acids and strong base solutions is same?ix. How crude crystals can be decolourized?x. Define sublimation.

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P R O F E S S O R S A C A D E M Yxi. State law of distribution.xii. What conditions are required for smooth filtration?xiii.

Give the extensive answers of the following questions.

QUESTION # 3. (a) Explain solvent extraction with respect to ether extraction. (4)(b) How crystals are collected and dried? (4)

QUESTION # 4. (a) Explain paper chromatography. (4) (b) What is Borne Haber cycle? (4)

QUESTION # 5. Explain first law of thermodynamics. (8)


OBJECTIVE: Tick the correct answer from the given options. (Time: 15 min)Statements A B C D

i. The process in which ionic compounds when dissolved in water dissociate into opposite charged ions called

Hydration Hydrolysis Ionization Association

ii. Cu metal can be purified in electrolytic cell by making impure Cu

Anode Cathode Electrolyte Salt

bridge

iii. The electrode through which electrons entered the solution

Cathode Anode From both None

iv.In which compound Oxidation state of Mn is +6

KMnO4 MnO2 K2MnO4 MnO

v. When Pb accumulator is discharged the density of H2SO4

1.25gcm-3 1.15gcm-3 1.25g/dm-3 1.15gdm-3

vi.Which of the following is best reducing agent

vii. In the reaction 2Fe+3Cl22FeCl3

Fe is reduced

Fe is Oxidized

Cl2 is Oxidized

None

viii. The lowest reduction potential in electrochemical series

Na F2 H2 Li

ix.The Oxidation no. of Oxygen in OF2 +2 -2 +1 -1

x. In electrolysis reaction take place at anode is

Addition Oxidation Decomposition

Reduction

xi.Stronger the Oxidizing agent, greater is the

Oxidation potential

Reduction potential

Redox potential

E.M.F of cell

xii. Fuels cells are means by which chemical energy may be converted

Heat energy

Magnetic energy

Sound energy

Electric energy

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P R O F E S S O R S A C A D E M Yinto

SUBJECTIVE (Chapter # 10)

Question # 2. Give the short answers of the following questions. (17 x 2 = 34)i. How Al is anodized in electrochemical cell?ii. What is difference b/w cell and battery?iii. Give a brief description of voltaic cell.iv. A salt bridge is not required lead storage battery, why?v. What is standard Hydrogen electrode?vi. What is electrolyte cell?vii.Write down reactions in alkaline battery.

viii. What is electromotive force?ix. What are spectator ions?x. Give electrolysis of aqueous NaNO3 solution.xi. How NaOH prepared by Nelson cell?xii.In molten salts electrolysis products are predictable while in electrolysis of aqueous

salts products are unpredictable, why?xiii.


QUESTION # 3. (a) What are electrochemical series? Give any three applications. (4)

(b) Balance following two equations by ion electron method. (4)

i) MnO4-1 + C2O4

-2 + H2O MnO2 + CO2 +OH- (Basic reaction)

ii) MnO4-1 + 2Cl- Mn+2 + Cl2 (acidic reaction)

QUESTION # 4. (a) Explain salt bridge and give its applications. (4) (b) Explain lead accumulator. (4)

QUESTION # 5. (a) What are difference b/w primary cells, secondary cells and metallic conduction, electrolytic conduction? (4)

(b) Briefly explain fuel cells. (4)

Chemistry Resilience, Seeking True Knowledge & Hard Working is our identity TEST # 2F.SC – Part II Pre-Board Examination Test System/2011 Chem/PAJ/2011Name: Marks:



Aluminium Oxide isAcidic oxide

Basic oxide

Amphoteric oxide None

The color of copper bead in hot oxidizing flame in borax bead test Green Red Blue

Reddish brown

Aluminium is passive towards Dil HNO3Conc. HNO3

Conc. H2SO4 HCl

The enert pair effect is most marked in element

B C Sn Pb

The solution of Borax in water is Basic Acidic Amphoteric None

Which of the following is 2.4% in earth crust

Silicon Rb Na N2

Borax is used in Medicine Eye drops Softening of H2O

All

The formula of pyroboric acid is H3BO3 H2B8O4 H6B4O9 H2B4O7

The chief ore of Aluminium is Na3AlF6A

l2O3.2H2OA

l2O3.H2O(D)

Al2O3.3H2

O Which of the following is not a use of

methyl siliconWater

repellentAntifreez

eLubricant Hydrauli

c break Which of the following is not a

semiconductorSn Se Ge Si

Which of the following is a special feature of borate glass

Heat resistant

Low melting

Make chemical garden

All


Question # 2. Give the short answers of the following questions. (17 x 2 = 34)i. What is the effect of heat on boric acid?ii. How semiconductors are used in transistors?iii. What is talc or soap stone?iv. What is chemistry of Borax bead test?v. How Borax is used to remove hardness of water?vi. Why silicone oil is preferred over ordinary petroleum oil?vii.How Borax is obtained from coleminite?viii. What happens when red lead is heated?ix. What is a chemical garden?x. What is vitreous silica?xi. Why articles of clay become reddish upon heating?xii.How clay is prepared from silicate rocks?


Question # 3. (a) Both Carbon and Silicon contain four e- in their outermost shell. Why their compounds widely different from each other? (4)

(b)How Al react with (i) N2 (ii) H2SO4 (4)Question # 4.

a. Give any two methods for synthesis of Borax. (4)b. Give four uses of Aluminium. (4)

Question # 5. a. Write formula of following compounds.

i. Zircon ii. Asbestos iii. Dolomite iv. Zeolite (4) b. Write a comprehensive note on massicot or litharge. (4)




i. Allotropic form of phosphorus which is most poisonous is White Red Black Yellow

ii. The chemical composition of brown ring in ring test for nitrates FeSO4.NO2 FeSO4.NO FeSO4.NO3 Fe2(SO4)3

iii. Which of following have garlic like smell? PCl3 PCl5 P2O3 P2O5

iv. Phosphorous acid upon thermal decomposition yields phosphoric acid and P2O5 Phosphene Phosgene P2O3

v. H2S upon reaction with HNO3 produce S+NO2+H2O SO2+NO+H2O H2SO4+NO2 NO+S+H2O

vi. Which of the following is heavy spar? Cu2S BaSO4 MgSO4 HgS

vii. Quartz contains 48% O2 89% O2 53% O2 50% O2

viii. Which of following acid of phosphorous can exists at temperature 316oC. H3PO3 H3PO4 HPO3 H4P2O7

ix. Nitric acid does not react with Platinum Iridium Titanium All of them

x. Oxides of Phosphorous are Acidic Amphoteric Basic Neutral

xi. Laughing gas is chemically NO N2O NO2 N2O4

xii. Which of the following species has maximum no. of unpaired electrons? O2 O2

+ O2- O2

-2

xiii.xiv.xv.xvi.xvii.


Question # 2. Give the short answers of the following questions. (17 x 2 = 34)i. Why does aqua regia dissolve gold and platinum?ii. Compare properties of sulphur and oxygen.iii. Why is SO3 dissolve in H2SO4 but not in H2O?iv. Give the advantages of contact process.v. NO2 is a strong oxidizing agent, prove with example.vi. P2O5 is a dehydrating agent, prove with chemical equation.vii. How black phosphorous is prepared?viii. How does Zn react with HNO3?ix. How does HNO3 react with As?x. How NO2 act as oxidizing agent?xi. How does N2O support combustion?

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P R O F E S S O R S A C A D E M Yxii. Why N2 is chemically inert at room temperature?xiii.


QUESTION # 3. How H3PO4 can be prepared? (8)

QUESTION # 4. Explain contact process with flow chart. (8)

QUESTION # 5. (a) What is Birkeland and Eyde’s process? (6)

(b) How HNO2 can be prepared? (2)



i. Which of the following Hydrogen Halide is the weakest acid in solution? HF HBr HI HCl

ii. The anhydride of HClO4 is ClO3 ClO2 Cl2O5 Cl2O7

iii. Which halogen occurs naturally in a positive oxidation state? Fluorine Chlorine Bromine Iodine

iv. Which halogen can oxidize all halide ions in molecular form?

F2 Cl2 Br2 I2

v. Which of the following gas is used for earth quake prediction?

Helium Neon radon Xenon

vi. Which compound is added in leaded gasoline to save engine from formation of lead oxide?

vii. Lanthenoids and Actinoids are calledTypical

transition elements

Non-Typical transition elements

Inner transition elements

Outer transition elements

viii. The shape of [Cu(NH3)4]-2 is Square planer Octahedral Trigonal Tetrahedral

ix. The coordination number of Pt in [PtCl(NO2)(NH3)4]2+ -2 4 1 6

x. The formula of haemitite ore is FeO Fe2O3 Fe3O4 Fe2O3.3H2O

xi. The second transition series starts with La Ac Y Zr xii. Which one is an example of alloy Steel Brass Bronze All of them xiii.xiv.xv.

/75

P R O F E S S O R S A C A D E M Yxvi.xvii.

SUBJECTIVE (Chapter # 5,6)

Question # 2. Give the short answers of the following questions. (17 x 2 = 34)i. What is disproportionation reaction give example?ii. What is Teflon give its uses?iii. Halogen are oxidizing agents, justify.iv. Which halogen is used as antiseptic?v. Why HF is less viscous as compared o H2O?vi. What is mean by available chlorine?vii. What are freons? Give their uses.viii. Why Fe+3 and Mn+2 show maximum paramagnetic behavior?ix. Define ligand. Give example.x. What is meant by chelates?xi. What is meant by corrosion? How it can be prevented?xii. What are interstitial compounds?xiii.


QUESTION # 3. (a) Give methods for preparation of XeF2 , XeF4 , XeF6. (3)

(b) Give Hesen Clever method for preparation of bleaching powder. (3)

(c) Why HF differ from other halogens? (2)

QUESTION # 4. (a) What are applications of Argon in daily life? (3)

(b) What is effect of increase in oxidation number of halogens on strength of oxy acids of halogens. (3)

(c) What are non-typical transition elements?

QUESTION # 5. (a) Give methods of preparation of KMnO4. (4)

(b) Give balance equation of cromyl test. (2)

(c) What is galvanizing? (2)



i. At temperature and pressure cracking can be done in the presence of Al2O3 SiO2 Al2O3 and SiO2 Fe2O3 and SiO2

ii. The rate of chemical reaction of organic compounds Fast Very fast Slow Intermediate

iii. Ethers show phenomenon of Functional

group isomerism

Metamerism Tautomerism Chain isomerism

iv. Hexane has isomers 3 4 5 6

v. The functional group of imine is -NH2 C=NH -OH -CHO

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P R O F E S S O R S A C A D E M Yvi. Carbocyclic compounds which resemble aliphatic

compounds Alicyclic acyclic Aromatic Hetex

vii. Grignard re-agent is reactive due toPresence of

halogen atomPresence of

Mg atomPolarity of C-Mg bond None of above

viii. Which one of following is not a nucleophile NH3 CH3O- CH3+ SH

ix. Which compound is formed when ammonia reacts with Grignard re-agent.

Alkane Ethyl amine Ethanol Methyl amine

x. Which of the following have highest bond energy? C-F C-Cl C-Br C-H

xi. The alkyl halide can be converted into alcohol by Dehydration Substitution Dehalogenation Elimination xii. Nitration of phenol at high T gives Benzoic acid Oxalic acid TNT Picric acid xiii.xiv.xv.xvi.xvii.


Question # 2. Give the short answers of the following questions. (17 x 2 = 34)i. What is meant by thermal cracking?ii. What is reforming of petroleum?iii. Define functional group.iv. What is knocking? How it can be stopped?v. Define octane number.vi. Why there is no free rotation in a double bond?vii. What are elimination reactions?viii. How alkyl halides are changed into alkanes?ix. What is reactivity of Grignard re-agent?x. Why the alkyl halides are more suitable for SN1 reactions?xi. Give reactivity of Alkyl halides.xii. How tetra ethyl lead can be prepared from alkyl halide?xiii.


QUESTION # 3. (a) Explain structure of CH=CH by Hyberidization. (3)

(b) What are functional group isomers? Give two examples. (c) How octane number can be improved? (2)

QUESTION # 4. (a) Explain Cis trans isomerism. (3)

(b) What are Heterocyclic compounds? (3) (c) Compare SN1 and SN2 reactions. (2)

QUESTION # 5. (a) How do you prepare alkyl halide from alcohols? (4) (b) How do you conver (4)

i) CH3-CH2-Br ⟶ CH=CH ii) CH3-CH3 ⟶ (C2H5)4Pb

(c) Write equation of Grignard re-agent when reacts with CO2. (1)


/75



i. Venyle acetylene combines with HCl to form Benzene Neoprene Chloroprene Divenyl

acetylene ii. B-B́-dichloroethyle sulphide is commonly known as Laughing gas Mustard gas Phosgene gas Bio gas

iii. Which one gas is used for artificial ripening of fruits Ethene Propene Ethane Methane

iv. Wthanol on treatment with alcoholic KOH gives Methane Ethene Ethyne Ethane v. Addition of water to propyne in the presence of HgSo4

and H2SO4 gives Propanal Propanone Propanol Acetal dehyde

vi. When acetylene is passed through copper tube at 300oC, it gives

Venyl acetylene

Divenyle acetylene

Benzene Toluene

vii. Which one of following has acidic H? Butane 1-butene 1-butyne 2-butyne

viii. Which one of following is not give by alkanes? Addition Decompositi

on Substitution Catalytic reactions

ix. Alkanes containing C5-C17 carbons are Gases Liquids Solids Unpredictable

x. What happen when bromine is added to ethene Epoxide form Vicinal dihalide form HBr formed Ethyl bromide

formxi. Acetic acid derives its name from Veniger Formica Barbra valera

xii. Mustard gas is Gas Low boiling liquid

High boiling liquid Steam

xiii.xiv.xv.xvi.xvii.


Question # 2. Give the short answers of the following questions. (17 x 2 = 34)i. What are saturated hydrocarbons?ii. Define with example Morkovnikov’s rule.iii. Differentiate b/w vicinal di-halides and germinal di-halides.iv. Give one comfirmatory test of alkyne.v. Define Bayer’s test with example.vi. What are symmetrical alkanes. How they are prepared?vii. Why π bond is more reactive as compared to sigma bond?viii. How synthetic rubber is obtained from acetylene?ix. How soda amide reacts with molten sodium?

x. Write IVPAC names of following. a) C−C−CCC

−C−CC¿

B) C−CC

−CC

−C−C−CCC

xi. Convert ethane into methane.xii. What is Raney Nickle? How it is prepared?xiii.


QUESTION # 3. (a) How alkanes are prepared by Sabatier sendern reaction and reduction of alkyle halid?

(3)

(b) Give polymerization reactions of alkynes. (3) (c) Distinguish b/w CH2=CH2 and CH=CH (2)

QUESTION # 4. (a) Explain methods of preparation of alkenes. (4)

(b) How alkenes react with H2O and O3. (4)

QUESTION # 5. Starting from alkyne, how following products are obtained? (8)

i. acetal-dehyde ii. Acrylonitrite iii. Oxalic acid iv. Venyl acetylene




i. Which one of the following is not meta directing group -CN -OH -CHO -COOH

ii. By which method the molecular mass of benzene was determined as 78.108

Specific gravity method

X – ray diffraction

Vapour density method

Mass spectrometry

iii. When Benzene is substituted by halogens only which one of the following halogens is given the number position in ring while writing the name of compound.

Fluorine Chlorine Bromine Iodine

iv. In Friedal craft alkylation AlCl3 is used to generate Strong electrophile

Weak elerophile

Strong nucleophile

Weak nucleophile

v. The rectified sprit contain 80% alcohol 95% alcohol 99% alcohol 100% alcohol

vi. K2Cr2 / H2SO4 generate Oxygen Hydrogen Nascent Oxygen Nascent Hydrogen

vii. The oxidation of isopropyl alcohol will yield Propane Propanol Propanone Propanoic acid

viii. Ethyl alcohol can be identified by Ring testSolver mirror

test Iodoform test Tollen’s reagent

ix. Heating a mixture of sodium benzoate and soda lime gives

Benzene Methane Toluene Naphthalene

x. Benzene is resistant to Alkylation Reduction Oxidation Ozonolysis

xi. Ethers are isomeric with Aldehydes Ketones Alcohols Acids xii. 2, 4, 6 – trinitrophenol is called Aspirin Picric acid p-nitrophenol m-nitrophenolxiii.xiv.


Question # 2. Give the short answers of the following questions. (17 x 2 = 34)i. How methanol is prepared commercially from water gas?ii. What is fermentation of sugar give reaction?iii. What is rectified siprit?iv. What is Lucas test?v. What is Dow’s method?vi. How methanol and ethanol are distinguished?vii. Why phenol is more acidic as compared to ethanol?viii. What is Williumson’s synthesis?ix. What is Wurtz-fittig reaction?x. What is friedal craft alkylation?xi. What is slphonation of benzene?xii. Why benzene has extra ordinary stability?

/75



QUESTION # 3. (a) Explain structure of benzene in detail. (8)

QUESTION # 4. (a) Explain directive influence of substituents on benzene ring? (8)

QUESTION # 5. Complete following reactions (2+2+2+2)

FeBr3

(i) + CH3-CH2 – OH → (ii) + Br2 ---------------→

(ii) C2H5OH + PCl5 → (iv) C2H5Cl + Ag2O →



Which of the following compound will not give idoform test

Acetaldehyde Acetone Butanone

3-pentanone

Canizarro’s reaction is not given byFormaldeh

yde Acetaldeh

yde Benzaldehy

de

Trimethyl acetaldehy

de

Calcium acetate on heating gives Acetaldehyde

Acetone Acetic acid Methane

Aldehydes may be distinguished from ketones by

Tollen’s test

Grignard reagent

Canizarro’s reaction

Aldol condensati

on

Trimer of formaldehyde is calledPara

aldehyde

Meta formal dehyde

Meta aldehyde All

Which one is most difficult to oxidize HCHO CH3CHO CH3COCH3C

H3CH2CHO

Which of the following is not fatly acid Propanoic acid

Acetic acid

Butanoic acid

Phthalic acid

which one is not carboxylic acid Oxalic acid

Benzoic acid

Picric acid Valeric acid

which one is basic amino acid Lysine Glycine Glutamic acid

Alanine

one can separate a mixture of carboxylic acid and aldehyde by

Na2SO3 Na2CO3 NaHCO3 H2SO3

which of the following can reduce carboxylic acids to alcohol

H2 / Ni H2 / Pt NaBH4 LiAlH4

/75

0 0

P R O F E S S O R S A C A D E M Y The origin of formic acid is Valera Red ants Oils Veniger

SUBJECTIVE (Chapter # 12 , 13)

Question # 2. Give the short answers of the following questions. (17 x 2 = 34)i. What is canizarro’s reaction?ii. Only methyl detones give idoform reaction while not other, why?iii. The reduction of aldehydes and ketones give alcohols, how?iv. What is aldol condensation?v. What is fehling solution test?vi. Convert propanone into 2-propanol.vii. How carboxylic acids react with carbonates?viii. What is Zwitterion?ix. What are acidic and basic amino acids?x. What are peptides and peptide linkages?xi. What is ninhydrin test?xii. Boiling points of aliphatic carboxylic acids are relatively high, why?


QUESTION # 3. (a) Give lab preparation of formaline. (3) (b) what are acetals? Give their preparation. (3) (c) What is Tollen’s test? (2)

QUESTION # 4. (a) Give polymerization of acetaldehyde and formaldehyde. (3)

(b) Give reaction of CH3COOH with SOCl2, NH3 with mechanism. (3)

(c) Convert CH4 → CH3COOH. (2)QUESTION # 5. (a) Give two methods of preparation of carboxylic acids. (4)

(b) What are essential and non essential amino acids? (2) (c) Convert CH3 – C – CH3 → CH3CH2OH (2)



/75


Which of the following is slowest reaction

Neutralization

reaction

Redox reaction

Hydrolysis of ester

Rusting of iron

Order of reaction may be Positive Negative Fractional All

Hydrolysis of tertiary butyl bromide

Zero order First order Second order Pseudo first order

Half life of N2O5 is 24min 48min 72min 24sec Catalyst for reaction

HCOOH H2O+COCu Al2O3 FeO V2O5

The rate of endothermic reactions …. with increase in T

Increases Decreases

First increase

then decrease

All

The rate of chemical reaction depends upon

Temperature

Surface area

Concentration

All

The reaction rate becomes four times by doubling the concentration of reactant. Then order of reaction

First order Second order

Third order Zero order

Velocity constant is rate constant when concentrations of reactants are

Zero Unity Two Three

Units of rate constant Mole dm-

3sec-1Mole cm-

3sec-1Mole dm3sec-

1 Sec-1

If products of a reaction itself act as catalyst called

Holo enzyme

Auto catalyst

Negative catalyst

Self catalyst

Enzyme for reaction C2H12O6 2C2H5OH + 2CO2

Diastase Invertase Zymase Hexokinase


Question # 2. Give the short answers of the following questions. (17 x 2 = 34)1. Differentiate b/w instantaneous rate and average rate.2. What is negative catalyst?3. Under what condition instantaneous rate and average rate are equal?4. Define activation of a catalyst.5. What are Psendo first order reactions?6. Briefly describe that finely divided catalyst is effective.7. Define order of reaction with example.8. Catalysts are specific for reaction. Explain with example.9. Rate of a chemical reaction is ever changing parameter, explain. 10. What are enzymes?11. Differentiate b/w rate and rate constant.12. Radioactive decay is always first order explain.


QUESTION # 3. (a) What is homogeneous and heterogeneous catalysis? (4)

(b) Explain concept of activation energy for endothermic and exothermic reaction. (4)

QUESTION # 4. (a) What is Arhenius equation? How T is related to Ea? (4)

(b) How rate of chemical reaction is determined by physical methods? (4)QUESTION # 5. (a) What is half life? Give concept of half lives for different order of reactions. (4)

(b) Give four characteristics of catalyst. (4)




One of the most significant achievement of polymer chemistry is the replacement of

Plastic Glass Rubber Natural

materials

Sand belongs to Natural

polymers In-organic Organic Artificial

The properties of polymeric materials largely depend upon

Chemical compositio

nStructure

No. of monomers All

PVC pipes belongs to Thermoplastic

Thermosetting

Terpolymer

Copolymer

Which of the following belongs to mono sacch arides

Raffinose Mannose Lactose Xylose

One of the following is more soluble in water and gives blue colour with I2.

Amylopectin

Glycogen Amylase Glactose

Glycogen is more closely resemble with Amylase Amylopectin Cellulose Chitin

The proteins denature by changes in Temperature

pH Redox conditions

All

Animal fats are located in Chest region

Adipose tissue

Muscles Vessels

When ergosterol is irradiated with ultraviolet rays it is converted into

Cholesterol Testosterone

Vitamin D2 Estrogens

Nylon is obtained by heating Acrylic acidEpichlorohy

drin Venyl

chloride

adipic acid with

hexamethylene

diamine The nitrogen base different in RNA as

compared to DNA.Cytocine Thymine Guanine Adenine

/75



Question # 2. Give the short answers of the following questions. (17 x 2 = 34)xiii. What is function of ligares?xiv. What is a poenzyme?xv. Define iodine number.xvi. What is sponification number?xvii. How proteins become denatured?xviii. Describe types of polymers on the basis of temperature.xix. What is degree of polymerization?xx. What is condensation polymerization?xxi. What is copolymer?xxii. What is addition polymerization?xxiii. What is rancidity of fats?xxiv.

Give the extensive answers of the following questions.QUESTION # 3. (a) Explain polysaccharides in detail. (4)

(b) What factors affecting enzyme activity? (4)QUESTION # 4. (a) Explain structure of DNA. (4)

(b) Explain structure of fats and oils. (4)QUESTION # 5. (a) Point out difference b/w starch and cellulose. (4)

(b) What are repeating units in (4) i. Polystyrene ii. Teflon iii. Nylon 6, 6 iv. Orlon


Chemistry Resilience, Seeking True Knowledge & Hard Working is our identity GRAND TESTF.SC – Part I Pre-Board Examination Test System/2011 Chem/PAJ/2011Name: Marks:

OBJECTIVE: Tick the correct answer from the given options. (Time: min)Statements A B C D

In combustion analysis, H2O vapours are absorbed by

50% KOH Mg(ClO4)2 NaOH MgCl2

When 6d orbital is completed, the entering electron goes into

7f 7s 7p 7d

In sp2 hybridization, the orbitals are oriented at an angle of

109.5o 120o 180o 90o

The sum of pH and pOH is always 7 Zero 14 10-14

The mass of one mole of electrons is 1.008 g 0.55 mg 0.184 mg 1.673 mg

Solvent extraction is an equilibrium process and is controlled by

Law of mass action

The amount of solvent

used

Distribution law

The amount of

solute The volume of ice increases than

liquid water by5 % 9 % 12 % 15 %

Splitting of spectral lines when atoms are subjected to strong electric fields is called

Zeeman's effect Stark effect

Photoelectric effect

Compton effect

Balmer series is found in I.R. Region U.V. Region Visible region

None of these

Which of hydrogen halides has highest % of ionic character?

HCl HBr HF HI

In case when [OH-]>[H+] the solution is

Acidic Neutral Basic None of these

If salt bridge is not used between two half cells, then the voltage

Decreases rapidly

Decreases slowly

Does not change

Drop to zero

Ionic solids are characterized byLow

melting points

Good conductivity

in solid state

High vapour pressures

Solubility in polar solvents

Which of the molecules has zero dipole moment?

NH3 CHCl3 H2O CO2

A solution of glucose is 10% W/V. The volume in which 1g mole of it is dissolved will be

1 dm3 1.8 dm3 200 cm3 900 cm3

The cathodic reaction in the electrolysis of dil H2SO4 with Pt electrodes is

Reduction Oxidation

Both oxidation

and reduction

None of these

The e/m value for the positive rays is maximum for

Hydrogen Helium Oxygen Nitrogen

/85


SUBJECTIVE (GRAND TEST)

Question # 2. Give the short answers of any twenty two questions. (22 x 2 = 44)1. Why do we feel uncomfortable breathing at higher altitudes?2. Why is necessary to decrease the pressure in the discharge tube to get the cathode

rays?3. What is stoichiometry and define yield of a chemical reaction?4. How limiting reactant controls the amount of products formed?5. Give reasons that law of conservation of mass has to be obeyed during stoichiometric

calculations.6. Which solvents are mostly used in crystallization?7. Differentiate between diffusion and effusion of the gases.8. Evaporation takes place at all temperatures. Explain with reason.9. Explain with reason that ionic crystals are highly brittle.10. Give the Moseley's equation. Also write its importance.11. Why ionization energy decreases within a group and increase along a period?12. No bond in chemistry is 100% ionic, justify it.13. Define bond energy and bond length.14. Differentiate between exothermic and endothermic reactions.15. Why do we need buffer solution in daily life?16. How do you justify that boiling point of the solvents increase due to the presence of

solutes?17. Give reason hat a porous plate or salt bridge is not required in the lead storage cell.18. Calculate the oxidation number of chromium in i) Cr2O7

2- ii) K2Cr2O7

19. Define Catalytic poisoning.20. Anionic radius is always larger than parent atom. Why?21. For what purpose bomb calorimeter is used?22. Why the sodium chloride is used to lower the melting point of ice?23. How X-Rays are produced?24. Volume of real gas cannot be zero at any temperature. Why?25. Why heat of vaporization of hexane is greater than that of ethane?26. Why the metals are malleable and ductile?27. What is the role of stationary phase in chromatography?28. Evaporation of liquid is cooling process. Justify it.29. Mg atom is twice heavier than carbon atom. Explain it.30. Give two applications of Dalton's law of partial pressures.31. What is plasma? Give its two uses.32. What is frequency and wavelength?33. The radioactive decay is always a first order reaction. Why?

Do any of the three questions, all questions carry equal marks? (8 x 3 = 24)

QUESTION # 3. (a) Describe manometric method for the measurement of vapour pressure.

(b) An organic compound having molecular mass 116, on combustion analysis gives 40.92% carbon and 4.58% hydrogen. Find out the molecular formula of such compound.

QUESTION # 4. (a) What are quantum numbers? Discuss their significance? (b) Calculate the number of molecules in the given amount of each

gas. i) 20.0cm3 of CH4 at 0oC and pressure 700 mm Hg. ii) 1.0cm3 of NH3

at 100oC and pressure of 1.5atm.QUESTION # 5. (a) Define and classify atomic orbital hybridization. Discuss the structure of BF3 in the light of orbital hybridization.

P R O F E S S O R S A C A D E M Y (b) Explain briefly energy of activation.

QUESTION #6. (a) Define the following. i) Surroundings ii) Standard enthalpy of atomization

iii) Standard enthalpy of solution. (b) What are non-ideal solutions? Discuss their types with example.

QUESTION #7. (a) Balance the following equations by oxidation number method.i) Br2 + NaOH→ NaBr + NaBrO3 + H2Oii) NaCl + H2SO4 MnO2 → Na2SO4 + MnSO4 + H2O + Cl2

(b) N2(g) and H2(g) combine to give NH3(g). the value of Kc in this reaction at 500oC is 6.0 x 10-2. Calculate the value of Kp for this reaction.

Chemistry Test 9

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