Mc Petroleum Products

Multiple Choice Questions : Petroleum Products 1985 1.

CH3

A.

B.

When 4.6 g of ethanol are completely burnt in air, what is the volume of carbon dioxide produced at room temperature and pressure?

2.

D.

(1) only (1) and (2) only (1) and (3) only (2) and (3) only

Cl

C

C

H

H

n

n

O

C

N

H

H

C

N H

H

C

C

C

n

OCH3

n CH3

*5. Which of the following statements concerning propan-1-ol is correct? A. When its vapour is passed over heated procelain, propane is produced. B. Its reaction with sodium is less vigorous than the reaction between sodium and water. C. Its aqueous solution has a pH value greater than 7. D. It has a lower boiling point than that of methanol. 6.

Which of the following statements concerning a “soapless” detergent is/are correct? (1) It reduces the surface tension of water. (2) It does not form a scum with seawater. (3) It is manufactured from fat and sodium hydroxide.

3.

A. B. C. D.

When polyvinyl chloride (PVC) is strongly heated in the above set-up, which of the following would occur?

A. (1) only B. (1) and (2) only C. (2) and (3) only D. (1), (2) and (3) Which of the following structures represents a polymer made by condensation polymerization?

(1) only (3) only (1) and (3) only (2) and (3) only

1986 7.

(1) The PVC chars. (2) White fumes are formed inside the combustion tube. (3) A white precipitate is formed in the testtube.

4.

H

H

(1) The product is immiscible with water. (2) The sulphuric acid is used up during the reaction. (3) The reaction is reversible. A. B. C. D.

C H

O

1.2 dm3 2.4 dm3 3.6 dm3 4.8 dm3

When ethanoic acid reacts under reflux with propan-2-ol in the presence of concentrated sulphuric acid, which of the following statements is/are correct?

C H

H

C.

(Relative atomic masses : H =1.0, C =12.0, O =16; Molar volume of a gas at room temperature and pressure = 24 dm3)

A. B. C. D.

H

Which of the following statements are true for a “soapless” detergent? (1) It does not form any bubbles when shaken with water. (2) Its molecule usually has a hydrophilic end. (3) It is usually synthesized from by-products of the petroleum refining industry. A. (1) and (2) only B. (1) and (3) only C. (2) and (3) only D. (1), (2) and (3)

8. O X+Y

CH3 CH2

C

+ H2O O

CH2 CH3

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Which of the following represents the correct structural formulae for X and Y in the above equation? X A.

Which of the following correctly describes the nature of reagent A and the product Q?

Y

A. B. C. D.

O

CH3CH2OH

CH3

C OH

B.

CH 3 CH 2

C

13. Alkanols can turn red litmus paper blue.

OH

Alkanols contain the -OH group.

O

CH3CH2CH2OH

CH3

C OH

9.

14. Which of the following does NOT occur during the fermentation of a glucose solution?

O

CH3

D.

CH 3

CH 3 CHOH

C OH

A. B. C. D.

Which of the following combinations correctly represents the monomer, repeating unit and structural formula of polypropene? monomer

A. B. C. D.

repeating unit

CH3 C

H

CH 3

H

CH 2

CH 3

CH3

H C

C

H

H

CH3

H C

H

H

H C

Product Q ethene ethane sodium ethanoate ethanoic acid

O

CH3CH2OH

C.

Reagent A dehydrating agent dehydrating agent oxidizing agent oxidizing agent

C H

H

H

15. Which one of the following statements concerning polystyrene is INCORRECT?

structural formula

H

H

H

C

C

C

C

C

C

H

H

H

H

H

H

CH3

H

CH3

C

C

C

C

H

H

H

H

CH3

H

H

H

H

C

C

C

C

C

H

H

H

H

H

CH3

H

CH3

Oxygen is evolved. Carbon dioxide is evolved. Ethanol is formed. The temperature of the solution rises.

A. Polystyrene is an electrical insulator. B. Polystyrene can be used as a heat insulator. C. Expanded polystyrene (styrofoam) is widely used as a packaging material. D. The structure of polystyrene is

n

H n

H

H C

n

C H

H

C

C

C

C

H

H

H

H

n

n

1987

.

1988

10. Which of the following statements concerning soapless detergent is correct? A. They are biodegradable. B. They form a scum with sea-water. C. They have a hydrophilic end and a hydrophobic end. D. They are made by the saponification of vegetable oils.

16. Which of the following are condensation polymers?

11. Which of the following statements concerning nylon is correct? A. It is an addition polymer. B. It melts in boiling water. C. It has a low tensile strength. O

17.

H

C

N D. It contains the linkage. 12. The following is a series of reactions starting from ethanol :

ethanol

reagent A

P

Na 2 CO 3 (aq)

CO 2 + Q

(1) (2) (3) (4)

urea-methanal perspex nylon 6,6 polystyrene

A. B. C. D.

(1) and (2) only (1) and (3) only (1), (2) and (4) only (2), (3) and (4) only

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(3) They are heat resistant. A. B. C. D.

Ethanol and propanoic acid are heated together as shown in the diagram. The main purpose of using the condenser is to A. B. C. D.

prevent ethanol from catching fire. prevent loss of the reactants. purify the product. separate ethanol from propanoic acid.

Directions : The following two questions refer to the possible structural formulae of THREE detergents shown below : Detergent I : CH 3

O

CH2 CH2 CH2 CH2 CH2 CH 2 CH2 CH2 C + CH2 CH2 CH2 CH 2 CH2 CH2 CH2 CH2 O Na

(1) and (2) only (1) and (3) only (2) and (3) only (1), (2) and (3)

1989 22. Which of the following pairs of products is formed when ethyl ethanoate is refluxed with sodium hydroxide solution? A. B. C. D.

CH3COOH and C2H5ONa CH3COONa and C2H5OH CH3OH and C2H5COONa CH3ONa and C2H5COOH

23. The structure of a soap molecule can be represented as follows : O C

CH3 CH3 CH3 CH3 CH3 CH 3 -

CH CH CH CH CH CH O Na CH 3 CH2 CH2 CH2 CH 2 CH2 C

+

O

CH3 CH3 CH3 CH3 CH3 CH 3

O

CH CH CH CH CH CH S O- Na+ CH 3 CH2 CH2 CH2 CH 2 CH2 O O

18. Which of the three detergents can function normally in both hard and soft water? I only III only I and II only II and III only

19. Which of the three detergents would cause the more serious pollution problems? A. B. C. D.

+

Which part of this structure makes the soap molecule hydrophobic? A.

Detergent III :

A. B. C. D.

-

O Na

Detergent II :

I only III only I and II only II and III only

20. When CH3CH=CH2 is bubbled into an acidified KMnO4 solution, which of the following compounds would be formed? A. CH3CH2CH(OH)2 B. CH2(OH)CH2CH2OH C. CH3C(OH)2CH3 D. CH3CH(OH)CH2OH 21. Which of the following properties make plastics useful in daily life? (1) They are chemically inert. (2) They can be moulded to any shape.

O

B.

C O

C. D.

Na

-

+

O C

24. Which of the following statements concerning soapless detergents are correct? (1) They do not form scum with calcium ions. (2) They are made from by-products of the petroleum industry. (3) They are all biodegradable. A. B. C. D.

(1) and (2) only (1) and (3) only (2) and (3) only (1), (2) and (3)

25. When nylon is heated, ammonia is given off. In the nylon molecule, nitrogen and hydrogen atoms are in a ratio of 1:3. 26. Bromine water can be readily decolorized by shaking with ethene, but not with ethane.

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Each ethane molecule contains a higher percentage by mass of hydrogen than each ethene molecule.

1990 27. Which of the following tests can be used to distinguished between ethane and ethene?

flame and liberates smoke with a vinegar smell. X is likely to be A. B. C. D.

32. Which of the following polymers is/are made by condensation polymerization? (1)

(1) burning the gas in air (2) bubbling the gas through bromine in tetrachloromethane (3) bubbling the gas through acidified potassium permanganate solution A. B. C. D.

(1) and (2) only (1) and (3) only (2) and (3) only (1), (2) and (3)

polythene. polyvinyl chloride. cellulose ethanoate. urea methanal.

(2)

OH

H C

n

H

A. B. C. D.

Which of the following combination is correct? A. B. C. D.

(1) and (2) only (1) and (3) only (2) and (3) only (1), (2) and (3)

29. Which of the following statements concerning the production of soap from vegetable oils and sodium hydroxide solution is/are correct? (1) Sodium hydroxide acts as a catalyst. (2) Glycerol is formed at the end of the reaction. (3) The reaction between vegetable oils and sodium hydroxide solution is reversible. A. (1) only B. (2) only C. (1) and (3) only D. (2) and (3) only 30. A glass of sweet wine is left on a dining table. After two days, the wine becomes sour. Which of the following type of reactions accounts for this change? A. B. C. D.

oxidation hydrolysis fermentation esterification

31. When a piece of plastic X is placed on a hot plate at about 200 oC, it starts to soften. When X is placed in a flame, it burns with a yellow

H

C

C

H

n

H

COOCH 3

C

C

H

CH 3

n

(1) only (3) only (1) and (2) only (2) and (3) only

28. Clothes stained with grease can be cleaned by detergents because detergents can (1) decrease the surface tension of water. (2) dissolve in both water and grease. (3) emulsify greasy particles.

(3)

H

1991 33. Propene reacts with acidified potassium permanganate solution to form A. B. C. D.

CH3CH2CH2OH CH3CH(OH)CH3 CH3CH(OH)CH2OH CH2OHCH(OH)CH2OH

34. Teflon, a polymer used for coating non-stick utensils, has the structure given below : F

F

F

F

F

F

C

C

C

C

C

C

F

F

F

F

F

F

Which of the following is the monomer for Teflon? A. 1,2-difluoroethane B. 1,2-difluotoethene C. 1,1,2,2-tetrafluoroethane D. 1,1,2,2-tetrafluoroethene 35. A sample of polymer gives acid fumes on strong heating. The polymer is probably A. B. C. D.

nylon. polypropene. polystyrene. polyvinyl chloride.

36. Propan-1-ol is refluxed with acidified potassium permanganate solution for a long time. Which of the following descriptions is/are correct? (1) The reactants undergo esterification. (2) Propanoic acid is formed. (3) The permanganate is reduced.

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A. B. C. D.

Page 5

(1) only (2) only (1) and (3) only (2) and (3) only

A.

Br

B.

Br

37. Which of the following statements is/are true for soapless detergents? (1) All soapless detergents are not biodegradable. (2) Soapless detergents form a scum with sea water. (3) Soapless detergents are mainly manufactured from products of the petroleum industry. A. B. C. D.

(1) only (3) only (1) and (2) only (2) and (3) only

H

H C

H

D.

H

CH3

H

C

C

C

H

Br

H

H

CH 3

H

C

C

C

Br

H

H

CH 3

H

H

C

C

C

Br

Br

H

H

CH3

H

C

C

C

Br

H

Br

H

H

H

H

42. The diagram below shows the structure of a soap. CH3(CH2)16COONa Soap has a hydrophilic head and a hydrophobic tail. Which of the following combinations is correct?

38. Which of the following compounds would react with each other to form a condensation polymerization polymer? (1)

C.

H

C H

hydrophilic head Na+ -COONa+ CH3(CH2)16COO-

A. B. C. D.

hydrophobic tail CH3(CH2)16CH3(CH2)16CH3(CH2)16COONa+

43. The polymer formed by H2N-(CH2)6-NH2 and O

(2)

HO

C

(CH2 )4

C

OH

O

(3)

H2 N

(4)

H2 N

A. B. C. D.

O

O

C

HO

C OH

H

NH 2

(1) and (2) only (1) and (3) only (2) and (4) only (3) and (4) only

39. In the preparation of soap, sodium chloride is added after the reaction between oil and sodium hydroxide has been completed. Sodium chloride can increase the solubility of soap.

1992 40. Which of the following compounds does NOT react with propan-1-ol? A. B. C. D.

(CH 2 )4

A. has a formula of

NH 2

(CH 2 )6

O C

sodium bromine water acidified potassium permanganate solution ethanoic acid

41. When 2-methylpropene reacts with bromine in tetrachloromethane, the product is

N

(CH2)6

H

O

N

C

O (CH2)4

C

n

.

B. is a thermosetting plastic. C. has cross-linkages. D. burns with a floral smell. 44. A compound, C2H4O2, reacts with ethanol in the presence of concentrated sulphuric acid to form a product with a fruity smell. Which of the following statements about this compound is/are correct? (1) It can liberate carbon dioxide from sodium carbonate solution. (2) It can decolorize acidified potassium permanganate solution. (3) Its aqueous solution is an electrolyte. A. (3) only B. (1) and (2) only C. (1) and (3) only D. (1), (2) and (3) 45. Nowadays plastics are often used as substitutes for metals. Which of the following are the advantages of plastics over metals in the motor car industry? (1) (2) (3) (4)

Plastics have low densities. Plastics are non-conductors of electricity. Plastics are resistant to corrosion. Plastics can be moulded.

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A. B. C. D.

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(1) and (2) only (3) and (4) only (1), (2) and (3) only (1), (3) and (4) only

46. Which of the following polymers is/are NOT suitable for making a container for boiling water? (1) perspex (2) urea-methanal (3) polyvinyl chloride A. B. C. D.

50. The first fraction of the distillation collected in flask Z is mainly A. B. C. D.

methanol. propan-1-ol. methanoic acid. propanoic acid.

51. When concentrated sulphuric acid is added dropwise to a solution containing urea and methanal in a test tube with shaking, a white solid can be formed. Which of the following statements about this experiment is/are correct?

(1) only (2) only (1) and (3) only (2) and (3) only

47. Polyester is a thermoplastic. Polyester is formed by condensation polymerization.

1993 48. A polymer has the following structure : Cl H

Cl H

Cl H

C

C

C

C

C

H

Cl H

Cl H

Cl

C

D. to prevent the loss of the reactants in M due to evaporation

Its monomer is A. chloroethene. B. 1,1-dichloroethane. C. 1,2-dichloroethene. D. 1,2-dichloroethane Directions : The following two questions refer to the following experiment : A mixture of methyl propanoate and sulphuric acid was allowed to react by heating under reflux for some time until no further change occurs. The resulting mixture M was then transferred to flask Y and heated as shown below :

(1) The reaction involved is condensation polymerization. (2) Concentrated sulphuric acid acts as an oxidizing agent. (3) The white solid is a thermoplastic substance. A. (1) only B. (3) only C. (1) and (2) only D. (2) and (3) only 52. When car exhaust gases are bubbled into citrated blood, the colour of the blood gradually becomes cherry red. Nitrogen dioxide is present in car exhaust gases.

1994 53. Which of the following substances can turn an acidified solution of potassium permanganate colourless? A. B. C. D.

ethane ethanol ethanoic acid ethyl ethanoate

54. X is a synthetic polymer. On gentle heating, it softens and chars. On strong heating, it burns with an acidic smell. X is probably A. B. C. D.

49. What is the function of the piece of apparatus labelled X? A. to condense the products in M B. to separate the products in M C. to prevent the loss of the products in M due to evaporation

polypropene. polystyrene. polyvinyl chloride. perspex.

Directions : The following two questions refer to the structural formulae of the following three detergents.

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Detergent I : -

CH2 CH2 CH2 CH2 CH2 O K CH3 CH2 CH2 CH2 CH2 C O

Detergent II : CH3

B. (1) and (3) only C. (2) and (3) only D. (1), (2) and (3)

+

CH2 CH2 CH2 CH2 CH2 CH2 CH2 CH2 CH2

1995 -

SO3 K

Detergent III :

+

60. The structural formula of a certain compound is shown below.

CH3 CH3 CH3 H H C C C CH3 C C H H H CH3 CH3

H -

SO3 K

H

+

H

55. Which of the above is/are soapless detergent(s)? A. B. C. D.

detergent I only detergent III only detergents I and II only detergents II and III only

56. Which of the following statements concerning these detergents is correct? A. The hydrocarbon tail of detergent III is hydrophilic. B. Both detergents I and II form scum with seawater. C. Detergent III causes more series pollution problems than detergent I when discharged into rivers. D. Both detergents II and III are made from fats. 57. Butane can immediately decolorize a solution of bromine in tetrachloromethane. Butane can be oxidized by bromine. 58. A compound has the following structure : H

H

Which of the following statements about this compound are correct? (1) It can decolorize bromine water. (2) It can be polymerized. (3) It can burn in air. A. B. C. D.

A. B. C. D.

(1) and (2) only (1) and (3) only (2) and (3) only (1), (2) and (3)

59. Which of the following substances can be fermented to give an alcoholic drink? (1) grapes (2) wheat (3) potatoes A. (1) and (2) only

H

H

C

C

C

H

H

OH

H

butan-1-ol. butan-2-ol. 2-methylpropan-1-ol. 2-methylpropan-2-ol.

61. Which of the following statements concerning alkenes is INCORRECT? A. They can decolorize a solution of bromine in 1,1,1-trichloroethane. B. They can decolorize red litmus solution. C. They can decolorize acidified potassium permanganate solution. D. They can be polymerized to form addition polymers. 62. The formula below can be used to represent the structure of some polymers.

C

CH3 CH2

C

The name of this compound is

H C

H

H

H

H

H

C H

C

C

C

X

H

X

(X represents an atom or a group of atoms.) Which of the following combinations is INCORRECT? A. B. C. D.

X H Cl CH3 C6H5

Name of polymer polyethene polyvinyl chloride perspex polystyrene

63. Which of the following compounds have the same empirical formula? (1) (2) (3) (4)

ethene ethane propene propane

A. (1) and (2) only B. (1) and (3) only

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C. (2) and (4) only D. (3) and (4) only

When a little detergent is added to a drop of water on a piece of woollen cloth as shown above, the drop spreads. Which of the following statements correctly explains this observation?

64. Which of the following statements concerning urea-methanal is/are correct? (1) It softens on gentle heating. (2) It can be used to make ash trays. (3) It consists of polymer chains with crosslinkages between the chains. A. B. C. D.

(1) only (2) only (1) and (3) only (2) and (3) only

A. The detergent dissolves readily in water. B. The detergent has a polar end which is hydrophilic. C. The detergent can form an emulsion with water. D. The detergent can reduce the surface tension of water. Directions : The following two questions refer to the experiment below.

65. Which of the following statements concerning the recycling of plastics are correct?

A reaction mixture containing acidified potassium dichromate solution and ethanol is heated using the set-up shown below :

(1) The recycling of plastics can help to solve the disposal problem of plastics. (2) The recycling of plastics can save raw materials derived from petroleum. (3) It is difficult to separate types of plastics in the recycling process. A. B. C. D.

(1) and (2) only (1) and (3) only (2) and (3) only (1), (2) and (3)

70. In this experiment, the reaction mixture is undergoing

66. Nylon softens on heating. Nylon is a condensation polymer.

1996

A. B. C. D.

reflux. distillation. emulsification. fractional distillation.

71. Which of the following statements concerning this experiment is correct? 67. Which of the following materials are suitable for making the base and handle of a frying pan? A. B. C. D.

Base aluminium copper titanium zinc

Handle polyvinyl chloride urea-methanal polyvinyl chloride urea-methanal

68. Which of the following substances is NOT derived from petroleum? A. B. C. D. 69.

bleach ethanol polystyrene soapless detergent

A. The acidified potassium dichromate solution acts as a catalyst. B. The reaction mixture gradually becomes brown. C. Ethanol is reduced during the experiment. D. Ethanoic acid is formed during the experiment. Directions : The following two questions refer to the experiment below used to study the causes of hardness of water. A student added some soap solution to four test tubes containing the same volume of different aqueous solutions of the same molarity. He shook the tubes and measured the minimum volume of soap solution needed to form a permanent lather. The results are tabulated below : Aqueous solution Sodium chloride Calcium chloride Potassium chloride

Minimum volume of soap solution needed to form a permanent lather / cm3

0.6 9.3 0.9

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Magnesium chloride

Page 9

8.5

72. Which of the following apparatus would be most suitable for measuring the volume of soap solution? A. B. C. D.

50 cm3 burette 50 cm3 measuring cylinder 25 cm3 pipette 10 cm3 beaker

73. Which of the following substances is/are responsible for the hardness of water?

B. (1) and (3) only C. (2) and (3) only D. (1), (2) and (3)

1997 77. Which of the following compounds CANNOT be produced directly from ethene? A. B. C. D.

carbon dioxide ethanol ethyl ethanoate 1,2-dibromoethane

(1) (2) (3) (4)

sodium chloride calcium chloride potassium chloride magnesium chloride

78. A glass of wine is left overnight, it becomes sour. Which of the following reactions is responsible for this change?

A. B. C. D.

(1) only (2) only (1) and (3) only (2) and (3) only

A. fermentation B. oxidation C. dehydration D. esterification 79. Which of the following statements concerning the compound, CH3COOCH2CH3, is correct?

74. Which of the following statements concerning the manufacture of ethanol by fermentation is INCORRECT? A. Wheat can be used as a raw material. B. Yeast is required in the fermentation process. C. Carbon dioxide is liberated in the fermentation process. D. The ethanol produced can be completely extracted by simple distillation. 75. Which of the following statements concerning nylon and urea-methanal is/are correct? (1) They are formed by condensation polymerization. (2) They have cross-linkages between polymer chains. (3) They are nitrogen-containing compounds. A. B. C. D.

(1) only (2) only (1) and (3) only (2) and (3) only

76. Which of the following statements concerning propan-1-ol are correct? (1) Propan-1-ol can be used as a solvent. (2) Propan-1-ol can undergo polymerization. (3) Propan-1-ol can undergo esterification with ethanoic acid in the presence of concentrated sulphuric acid. A. (1) and (2) only

A. B. C. D.

It is a food preservative. It has a pleasant smell. Its systematic name is methyl ethanoate. It is an electrolyte.

80. Dilute ammonia solution is used in domestic glass cleansers because (1) it can saponify grease. (2) it is non-corrosive. (3) it contains ammonium ions which can emulsify grease. Which of the above statements is/are correct? A. B. C. D.

(1) only (2) only (1) and (3) only (2) and (3) only

81. Which of the following statements about using ethanol as a car fuel is correct? (1) Ethanol is a cleaner fuel than petrol. (2) Using ethanol as a car fuel is economical in agricultural countries with sugar cane as the main crop. (3) A car engine has to be suitably modified when using ethanol as a fuel. A. B. C. D.

(1) and (2) only (1) and (3) only (2) and (3) only (1), (2) and (3)

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82. Which of the following methods can be used to solve the pollution problems associated with the disposal of plastic waste?

Beer is made by fermentation of barley while red wine is made by fermentation of grapes.

(1) recycling of plastics (2) making biodegradable plastics (3) burning plastics waste in incinerators with tall chimneys A. B. C. D.

(1) and (2) only (1) and (3) only (2) and (3) only (1), (2) and (3)

86. Consider the following manufacturing process: naphtha

1998

83. A detergent has the following structure: CH3 H H3C

CH3 H

C C

polymerization

compound X

product Y

Which of the following graphs (not drawn to scale) can represent the change in relative molecular masses of the substances involved during the manufacturing process? A.

C C

H CH3

cracking

H CH3

SO3-Na+

Which of the following statements concerning the detergent is correct? A. B. C. D.

Its hydrocarbon chain is hydrophilic. It can be manufactured from vegetable oil. It is readily degraded by micro-organisms. It acts as an emulsifier in the cleaning process.

n a p h th a

X

Y

B.

84. X is a compound containing four carbon atoms. It gives negative results with the following tests. Test (1) Treating X with sodium hydrogencarbonate solution (2) Treating X with a solution of bromine in 1,1,1-trichloroethane (3) Heating X with acidified potassium dichromate solution

n a p h th a

X

Y

n a p h th a

X

Y

C.

The structural formula of X may be A. B. C. D.

CH3CH2CH=CH2. CH3CH2CH2CH2OH. CH3CH2CH2CO2H. CH3CO2CH2CH3.

85. The ethanol content of beer is less than that of red wine.

D.

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H

Cl

H

Cl

H

Cl

H

Cl

C

C

C

C

C

C

C

C

Cl

H

Cl

H

Cl

H

Cl

H

Which of the following statements concerning X are correct? X

n a p h th a

Y

87. Wash bottles used in the chemistry laboratory are commonly made of polyethene. Polyethene is an addition polymer.

(1) The monomer of X is CHCl=CHCl. (2) X can be used to make electric sockets. (3) The flue gas produced by the incineration of X can cause the formation of acid rain. A. B. C. D.

(1) and (2) only (1) and (3) only (2) and (3) only (1), (2) and (3)

Directions: The following two questions refer to the experiment mentioned below. 88. Which of the following statements concerning polystyrene is/are correct? (1) It is a condensation polymer. (2) It can be remoulded. (3) It can be used to make packaging material for electrical appliances.

Some concentrated sulphuric acid and pumice stones were added to an alkanol and an alkanoic acid. The mixture was heated under reflux for some time and the following compound was obtained: H H

A. B. C. D.

(1) only (2) only (1) and (3) only (2) and (3) only

89. Which of the following problems are associated with the excessive use of soapless detergents? (1) They can cause skin allergies. (2) They form foam when discharged into rivers and lakes. (3) They form scum when discharged into the sea. A. B. C. D.

(1) and (2) only (1) and (3) only (2) and (3) only (1), (2) and (3) 1999

90. Which of the following substances has the lowest boiling point? A. B. C. D.

ethanol propan-1-ol propane butane

C

O

H

O

H

H

C

C

C

H

H

H

92. Which of the following combinations is correct? A. B. C. D.

Alkanol Methanol Methanol Ethanol Ethanol

Alkanoic acid Ethanoic acid Propanoic acid Ethanoic acid Propanoic acid

93. Which of the following statements concerning the experiment is correct? A. Concentrated sulphuric acid acts as an oxidizing agent in the reaction. B. The purpose of using pumice stones is to speed up the reaction. C. A fractionating column should be used in the experimental set-up. D. Heating under reflux can prevent the loss of reactants and products. 94. Which of the following substances is a thermoplastic as well as a condensation polymer? A. B. C. D.

nylon Perspex polyethene urea-metanal

91. Plastic X has the following structure: 95. Which of the following statements concerning a soapless detergent are correct?

MC : Petroleum Products

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(1) It can be prepared by heating a cooking oil with sodium hydroxide solution. (2) It acts as a wetting agent by reducing the surface tension of water. (3) It acts as an emulsifying agent in the cleaning process. A. B. C. D.

(1) and (2) only (1) and (3) only (2) and (3) only (1), (2) and (3)

(3) PVC was oxidized by the concentrated sulphuric acid. A. B. C. D.

(1) only (2) only (1) and (3) only (2) and (3) only

100.A polymer has the following structure: CH3

CH3

C

C

H

H

96. Local tap water produces a scum with soap. Water containing calcium ions can form an insoluble compound with soap.

What is the monomer of this polymer? A. B. C. D.

2000 97. Which of the following pairs of compounds can be distinguished by treating with an acidified potassium dichromate solution? A. ethane and ethene B. ethanol and propan-1-ol C. sodium carbonate and sodium hydrogencarbonate D. sodium sulphite and sodium sulphate

O C

O

H

H

C

C

H

H

H

and

H

H

H

O

C

C

C

H

H

O

butane but-1-ene but-2-ene 2-methylpropene

101.Which of the following articles should be made from thermosetting plastics? (1) wall paper (2) television casing (3) water bucket

98. Consider the compounds represented by the two structures below:

H

n

H

Which of the following statements concerning these compounds is correct? A. Both compounds can turn wet blue litmus paper red. B. Both compounds have the same odour. C. Both compounds have the same molecular formula. D. Both compounds have the same boiling point.

A. B. C. D.

(1) only (2) only (1) and (3) only (2) and (3) only

102.Which of the following polymers is/are made by condensation polymerization? O

(1)

C

(CH2)4

O

H

C

N

O C

(2)

(3)

CH2

C

F

CH3 F

C

C

F

F

H (CH2)6

N

n

OCH3

n

n

99. Some concentrated sulphuric acid was poured into a sink connected to a catchpot made of polyvinyl chloride (PVC). After some time, the catchpot became deformed. Which of the following explanations for the deformation of the catchpot is/are correct? (1) The heat liberated when the concentrated sulphuric acid mixed with the water in the catchpot caused PVC to soften. (2) PVC was decomposed into its monomers by the concentrated sulphuric acid.

A. B. C. D.

(1) only (2) only (1) and (3) only (2) and (3) only

103.Which of the following statements concerning soaps are correct? (1) They are esters.

MC : Petroleum Products

(2) They can reduce the surface tension of water. (3) Their aqueous solutions are alkaline. A. B. C. D.

(1) and (2) only (1) and (3) only (2) and (3) only (1), (2) and (3)

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