Sec 4 Chem Prelim Paper 1

Name ___________________________ ( ) Class ______________

PRELIMINARY EXAMINATION GENERAL CERTIFICATE OF EDUCATION ORDINARY LEVEL

CHEMISTRY 5072/01 Paper 1 Multiple Choice Tuesday 20 September 2011

1 hour Additional Materials: Multiple Choice Answer Sheet

READ THESE INSTRUCTIONS FIRST Write in soft pencil. Write your name, class and index number on the Answer Sheet in the spaces provided. Do not use correction fluid or correction tape. There are forty questions on this paper. Answer all questions. For each question there are four possible answers A, B, C and D. Choose the one you consider correct and record your choice in soft pencil on the separate Answer Sheet. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in this booklet. .

This question paper consists of 16 printed pages, including the cover page and Periodic Table.

[Turn Over]

1. The apparatus below is used to show the diffusion of gases. Which pair of gases X and Y

would cause level of the water at L in the U-tube to drop?

Gas X Gas Y

A CO2 O3

B CH4 H2

C C2H4 N2

D Ar CO2 2. An experiment was set up as shown below.

After several days, the liquid in the jar had the same blue colour throughout. This was the result of the movement of

A sulfate ions only.

B copper(II) ions, sulfate ions and water molecules.

C copper(II) sulfate molecules only.

D water molecules only.

Aqueous copper(II)sulfate

Distilled water

3. Two students each carried out a chromatography experiment to see what dyes are present in the brown food colouring from a candy.

Their chromatograms are shown :

student 1 student 2

Which statement below best explains the difference in their chromatograms?

A Student 1 used a lesser volume of the same solvent than student 2.

B Student 2 used a different solvent from student 1.

C Student 1 started the chromatography later than student 2.

D The concentrations of the food colouring used by students 1 and 2 are different. 4. When solution X is mixed with solution Y, a white precipitate and a solution Z is formed.

The method to obtain white precipitate from the reaction mixture is _____________

A evaporation followed by distillation.

B evaporation followed by filtration to obtain residue.

C filtration to obtain filtrate.

D filtration to obtain residue. 5. In an experiment, 10.0 cm3 of 1.0 mol/dm3 of aqueous iron(II) sulfate was mixed with

10.0 cm3 of 1.0 mol/dm3 of aqueous sodium hydroxide. FeSO4 (aq) + 2NaOH (aq) � �Fe(OH)2 (s) + Na2SO4 (aq) What did the reaction flask contain when the reaction was completed?

A A green precipitate only.

B A green precipitate in a colourless solution.

C A white precipitate in a green solution.

D A green precipitate in a green solution.

solvent front

Starting line

6. The diagram shows a particle of an element in Period 2. What could the particle be?

A an ion of boron

B an atom of carbon

C an atom of neon

D an ion of nitrogen 7. Ions of two isotopes of the transition metal, cobalt, are shown below.

2758

Co2+ and 2760

Co2+

Which of the following statements is true?

A 2760

Co2+ has 2 more protons than 2758

Co2+

B 2758

Co2+ contains 29 electrons, 2 less than 2760

Co2+

C 2760

Co2+ diffuses faster than 2758

Co2+

D The number of electrons in 2758

Co2+ and 2760

Co2+ are 2 less than that of protons

e-

e- e- e-

e- e-

e- e-

e- e-

8. The atomic structures of two elements whose symbols are P and Q are shown below

What is the mass of one mole of compound formed by reacting P and Q together?

A 18g

B 25g

C 32g

D 43g 9. At room temperature, tin exists as white tin which has a giant metallic structure. Below

18oC, tin changes slowly to grey tin which has a giant covalent structure (similar to that of a diamond). Which of the statement below is correct?

A White tin can conduct electricity while grey tin cannot.

B Both types of tin can conduct electricity.

C White tin is hard while grey tin is soft.

D Both types of tins are soft and malleable. 10. One mole of carbon dioxide

(i) contains 6 x 1023 carbon dioxide atoms. (ii) contains the same number of molecules as 2g of hydrogen gas. (iii) has a mass of 28g

Which of the following is correct?

A (i) only

B (ii) only

C (iii) only

D (i) and (ii) only

P Q

11. When 2.20g of sample of an oxide of nitrogen was analysed, it was found to contain

0.57g of nitrogen. What is the empirical formula of the sample of oxide of nitrogen? A NO

B N2O5

C N2O

D N2O4 12. One way to remove poisonous nitrogen monoxide (NO) from motor vehicle exhaust is to

inject a stream of ammonia gas into the exhaust vapour. 6NO (g) + 4NH3 (g) → 5N2 (g) + 6H2O (g) A car emits 3 dm3 of nitrogen monoxide each kilometre and is driven 40 000 km a year. What volume of ammonia gas is needed each year to clean up the exhaust gas?

A 20 000 dm3

B 60 000 dm3

C 80 000 dm3

D 120 000 dm3 13. Which of the following diagrams represents molecules of an

element?

14. Which of the following reactions are exothermic?

1. 6CO2 + 6H2O ���� C6H12O6 + 6O2 2. 2C4H10 + 13O2 ���� 8CO2 + 10H2O 3. H + Cl ���� HCl

A 1 and 2 only

B 2 and 3 only

C 1 and 3 only

D 1, 2 and 3

A B C D

15. A piece of litmus paper was soaked in a concentrated aqueous sodium chloride and

supported on a glass slide. The paper was connected to a d.c. supply as shown in the diagram. Which one of the following shows the correct observations near the negative electrode and the positive electrode after the current had passed through the circuit for 3 minutes?

negative electrode positive electrode

A no change bleached

B bleached no change

C blue bleached

D red bleached 16. Which of the following set-up would produce the greatest reading on the voltmeter?

D.C.B.A.

17. In an electrolysis experiment involving molten calcium chloride, 1.11g of calcium was

deposited at the cathode. Find the volume of chlorine gas liberated at the anode.

A 0.33dm3

B 0.67dm3

C 1.33 dm3

D 1.97 dm3

1 mol/dm3 sodium chloride solution

1 mol/dm3 hydrochloric acid 1 mol/dm3 sugar solution

18. The following is a half equation for a reaction.

OsHIreqHIO 223 21 +→++ −+−

What are the values of q, r and s?

q r s A 3 5 6

B 5 3 6

C 5 6 3

D 6 5 3 19. The metal zirconium (Zr) is above hydrogen in the reactivity series. The ion of zirconium

has a charge of 4+. Which of the following equations correctly represents the reaction between zirconium and steam?

A Zr +2H2O � ZrO2 + 2H2

B Zr + 4H2O � ZrO4 + 4H2

C Zr + 2H2O � Zr(OH)2 + H2

D Zr + 4H2O � Zr(OH)4 + 2H2 20. Sodium reacts with potassium nitrate according to the equation below.

10Na (s)+2KNO3 (s) →→→→ 5Na2O (s)+N2 (g)+K2O (s)

Which element has undergone reduction in the above reactions?

A Nitrogen in potassium nitrate.

B Oxygen in potassium nitrate.

C Potassium in potassium nitrate.

D Sodium. 21. Which of the following arrangements of electrons is that belonging to an atom of an

element with the strongest oxidizing properties?

A 2,1

B 2,7

C 2,8,2

D 2,8,6

22. In two separate experiments, a substance was decomposed and the gas evolved was collected. The graph shows the total volume of gas collected against time for each experiment.

Which one of the following graphs shows how the speed of reaction varied with time in each experiment?

23. In the graph, curve X represents the result of the reaction between 2.4g of magnesium

ribbon and 50cm3 of 1 mol/dm3 sulfuric acid at 50oC. Which graph could produce curve Y?

A 2.4g of magnesium ribbon at 60oC

B 25cm3 of 2 mol/dm3 dilute sulfuric acid at 50oC

C 12.5cm3 of 2 mol/dm3 dilute sulfuric acid at 60oC

D 2.4g of magnesium powder at 50oC

24. A new element called londinium has been discovered. It is a white silvery solid with a low melting point. It floats on water and reacts vigorously with it to liberate hydrogen gas. Which family in the Periodic Table would you place this new element in?

A Alkali metal

B Alkaline earth metal

C Halogens

D Transition metals 25. In each of three experiments, a halogen was added to separate solutions containing ions

of one of the other two halogens. The results are shown in the table.

What were the halogens X, Y and Z?

solution of halide experiment

halogen added

X Y Z

1 X2 - no reaction reaction occurs

2 Y2 reaction occurs - reaction occurs

3 Z2 no reaction no reaction -

X Y Z

A Br2 Cl2 I2

B Br2 I2 Cl2

C Cl2 Br2 I2

D Cl2 I2 Br2 26. Which one of the following would distinguish between sodium chloride and sodium

bromide solution?

A Adding chlorine water

B Adding bromine water

C Adding sodium hydroxide solution

D Adding dilute hydrochloric acid

27. The position of metal X in the reactivity series is: Ca, Mg, X, Al, Zn, Fe. Metal X is best obtained by?

A reduction of its oxide by heating with coke.

B reduction of its oxide by heating with hydrogen.

C electrolysis of its molten oxide. D electrolysis of its dilute aqueous nitrate. 28. An element Z reacts in the following ways.

2Z + O2 � 2ZO

Z + 2HCl � ZCl2 + H2

ZO + H2 � no reaction What is likely to be Z?

A aluminium

B calcium

C lead

D copper 29. Four test tubes were set up as shown in the diagrams below.

Each piece of iron was protected on one side by a different coating. In which test tube is the iron least likely to rust?

D

30. X, Y and Z are elements belonging to the same period of the Periodic Table. The oxide of X dissolves in water, forming a solution which changes blue litmus paper to red. Y reacts with water, forming a solution which changes red litmus to blue. The oxide of Z reacts with both acid and alkali. If the elements are arranged in order of increasing atomic number, the correct order would be

A X, Y, Z

B X, Z, Y

C Y, X, Z

D Y, Z, X 31. Which one of the following groups consists of an acid, a base and a salt?

A CaO, Ca(OH)2, H2SO4

B HCl, H2SO4, BaSO4

C CaO, HCl, BaSO4

D NaOH, NaCl, Na2SO4 32. A 25cm3 sample of dilute sulfuric acid contains 0.025 moles of the acid.

What is the hydrogen ion concentration in the solution?

A 0.25 mol/dm3

B 0.50 mol/dm3

C 1.00 mol/dm3

D 2.00 mol/dm3 33. Why is it wasteful to add ammonium nitrate fertiliser to soil which has recently been

treated with slaked lime, Ca(OH)2?

A The percentage by mass of nitrogen in ammonium nitrate is low

B Ammonium nitrate can easily be decomposed

C Slaked lime has made the soil too basic for ammonium nitrate to act on

D Ammonium nitrate will react with slaked lime and ammonia is liberated into the air

34. The rain in Mars was suspected to have a pH value of 4. What could be present in the atmosphere at Mars to cause such pH?

A oxygen

B nitrogen

C carbon monoxide

D sulfur dioxide 35. The apparatus shown below was set up to prepare and collect a gas.

Which one of the following gases could be prepared and collected in the apparatus?

A ammonia

B carbon dioxide

C hydrogen

D Sulphur dioxide

36. The diagram shows the structure of a compound Z.

Which prediction about its properties is not likely to be true?

A It can react with zinc to liberate hydrogen gas.

B It can turn acidified potassium iodide solution from colourless to brown.

C It can undergo addition polymerisation.

D It can undergo condensation polymerisation by itself. 37. A student investigated the reaction of different vegetable oils with hydrogen. 50 cm3 of

hydrogen was passed through 1 g sample of vegetable oils containing a suitable catalyst. The volume of hydrogen remaining after each reaction was recorded.

vegetable oil volume of hydrogen remaining / cm3

W 0 X 23 Y 50 Z 19

Which vegetable oil(s) is/are saturated?

A W only

B X and Z only

C Y only

D W, X and Z 38. The ester, CH3CH2CH(CH3)CH2OOCCH3, has an odour of bananas.

Which set of reagents could be used to prepare this ester in the laboratory?

A CH3CH2CH2CH(CH3)CH2CO2H , CH3OH

B CH3CH2CH(CH3)CH2OH, CH3CO2H

C CH3CH2CH(CH3)CH2CO2H, CH3OH

D CH3CH2CH(CH3)CH2OH, CH3CH2CO2H

C C

H

O H

C C

H

H

H H

C C O

H

H H

O H C

H

H

39. How many isomers are present for C3H7OH?

A 2

B 3

C 4

D 5 40. In an artificial hip joint, bone cement is used to attach the poly(ethene) cup for

the joint to the pelvic girdle. Bone cement is formed by the polymerisation of methyl 2-methylpropenoate. The process is highly exothermic.

Which of the following are correct statements about this polymerisation? (1) The repeat unit of the polymer is

(2) The formation of the cement occurs by addition polymerisation. (3) Less energy is released in making the C – C bonds than absorbed in breaking a C = C bond.

A 1 and 2 only

B 2 and 3 only

C 1 and 3 only

D 1, 2 and 3