Mc Fossil Fuels

Multiple Choice Questions : Fossil Fuels

The above reaction can be classified as (1) an addition reaction. (2) a substitution reaction. (3) a redox reaction.

1985 1.

A. B. C. D.

Which of the following hydrocarbons would most probably be present in petrol ? A. B. C. D.

C2H6 C4H8 C4H10 C6H14

6.

2.

The above set-up is suitable for A. separating a mixture of water and kerosene. B. separating a mixture of methanol and ethanol. C. preparing liquid N2O4 from lead(II) nitrate. D. determining the boiling point of water.

1986

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

Which of the following would be present in a higher concentration inside the Cross Harbour Tunnel than in the atmosphere ? (1) (2) (3) (4)

carbon monoxide carbon dioxide nitrogen dioxide lead compounds

A. B. C. D.

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

1988 7.

3.

Which of the following would NOT reduce the amount of pollutants in the atmosphere ? A. reducing the lead content of gasoline B. using fuels of low sulphur content C. building tall chimneys for factories and incinerators D. installing filters and electrostatic precipitators in factory and incinerator chimneys

In the above experiment, X can be (1) crude oil. (2) propan-1-ol. (3) medicinal paraffin. A. B. C. D.

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

1989 8.

(1) hydrogenation (2) polymerization (3) combustion

1987 4.

5.

Liquefied petroleum has (LPG) consists mainly of A. butane. B. carbon monoxide. C. hydrogen. D. methane. C3H8(g) + 2Br2(g) → C3H6Br2() + 2HBr

Which of the following types of reaction can propene undergo ?

9.

A. (1) and (2) only B. (1) and (3) only C. (2) and (3) only D. (1), (2) and (3) Which of the following statements concerning methane is INCORRECT ? A. It is found in natural gas. B. It is combustible. C. It reacts with chlorine under sunlight.

MC : Fossil Fuels

Page 2

D. It is the main component of local town gas.

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

1990 1992

10. The boiling points of some hydrocarbons are given in the table below : Hydrocarbon Boiling point (oC)

Ethane -89

Ethene -104

Propene -48

If a mixture of these three hydrocarbons at -110oC is allowed to warm up gradually to -80oC, which of the following will happen? A. Ethene will remain in the liquid state. B. Propene will remain in the liquid state. C. Ethane and ethene will remain in the liquid state. D. Ethane, ethene and propene will exist in the gaseous state.

14. 0.01 mol of C2H5OH is burnt completely in oxygen. What are the numbers of moles of carbon dioxide and water formed respectively ? A. B. C. D.

water 0.03 0.03 0.06 0.06

15. Which of the following statements concerning CH3CH3, CH3CH2CH3 and CH3CH(CH3)CH3 is correct ?

11. Which of the following statements concerning acid rain is NOT correct ? A. Acid rain can be caused by the burning of fossil fuel. B. Acid rain can corrode buildings. C. Acid rain can make the soil infertile by removing minerals from the soil. D. Acid rain can attack the human respiratory system.

carbon dioxide 0.01 0.02 0.02 0.04

A. They have different boiling points. B. They belong to different homologous series. C. They burn in excess oxygen to form carbon monoxide and water. D. They readily decolorize bromine in tetrachloromethane. 16. Which of the following pollutants are found in the exhaust from cars using petrol as fuel ? (1) CO (2) SO2 (3) NO2

1991 12. Equal moles of chlorine and methane are allowed to react in diffused sunlight. Which of the following statements concerning the reaction is/are correct ?

A. B. C. D.

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

(1) The reaction is violent. (2) The final product contains CH3Cl and HCl only. (3) The final product contains CH3Cl, CH2Cl2, CHCl3, CCl4 and HCl. A. (1) only B. (2) only C. (1) and (2) only D. (1) and (3) only 13. The rain-water samples collected in Tsuen Wan District are found to be more acidic than those collected in Central District. Which of the following air pollutants would be responsible for this phenomenon ? (1) carbon monoxide (2) sulphur dioxide (3) nitrogen dioxide A. (2) only

1993 17.

C10 H22

caralyst heat

C6 H14 + 2 X

In the above process, which of the following combinations is correct ? A. B. C. D.

Process fractional distillation fractional distillation cracking cracking

X an alkane an alkene an alkane an alkene

MC : Fossil Fuels

Page 3

18. Which of the following statements about fossil fuels is correct ? A. They are liquids or gases. B. They are all formed from plants which died millions of years ago. C. They can be recycled to help conserve energy resources. D. They cause air pollution when burnt.

22. Which of the following products may be formed from cracking of heavy oil fraction ? (1) CO (2) C2H4 (3) C8H18 A. B. C. D.

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

1994 Direction : The two questions below refer to the following diagram which shows a fractionating column of an oil refinery.

23. Which of the following are characteristics of a homologous series ? (1) Members of the series can be represented by the same general formula. (2) Members of the series have same physical properties. (3) Members of the series have similar chemical properties. A. B. C. D.

19. Which of the following fractions is NOT cracked to produce more useful products ? A. B. C. D.

P R S T

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

24. Huge quantities of carbon dioxide produced by the burning of fossil fuels cause the greenhouse effect. Carbon dioxide can trap the solar energy which is re-radiated from the earth’s surface to the atmosphere.

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

Fraction P has the highest boiling point. Fraction T is used for surfacing roads. Fraction U is the least viscous. Fraction S burns with a more sooty flame than fraction Q. 21. Which of the following label(s) should be placed on a bottle containing tetrachloromethane ? (1)

A. B. C. D.

(2)

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

(3)

1996 25. Which of the following methods can be used to minimize the air pollutant mentioned ? A. increasing the air supply to remove nitrogen dioxide produced by burning heavy oil B. using catalytic converters to remove lead compounds produced by burning leaded petrol C. using scrubbers to remove carbon monoxide produced by the incomplete combustion of diesel D. using electrostatic precipitators to remove particulates produced by burning coal 26. The cost of town gas goes up when the cost of crude oil rises.

1995

Town gas is manufactured from naphtha.

MC : Fossil Fuels

Page 4

1997 *27.Which of the following compounds represents the first member of a homologous series ? A. B. C. D.

ethane ethene ethanol ethanoic acid

28. The model shown below represents a compound containing 6 hydrogen atoms (white spheres) and 3 carbon atoms (black spheres).

A. B. C. D.

cracking redox catalytic hydration destructive distillation

*31.Which of the following statements concerning the reaction of methane with bromine is/are correct ? (1) It is an addition reaction. (2) It is a substitution reaction. (3) A similar reaction will occur if propane is used instead of methane. A. B. C. D.

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

32. Which of the following measures can reduce the formation of acid rain ?

Which of the following statements concerning the compound is INCORRECT ? A. Its structural formula is C3H6. B. It can be prepared by cracking petroleum. C. It can decolorize bromine in 1,1,1trichloroethane. D. It can undergo polymerization.

(1) installing catalytic oxidisers in cars (2) using unleaded petrol in cars (3) using fuels of low sulphur content in cars A. B. C. D.

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

1998 Directions : The following two questions refer to the experiment shown below :

33. Which of the following substances is the main constituent of town gas? A. B. C. D.

29. Which of the following set-ups should be connected to the delivery tube to collect the gaseous products formed ?

hydrogen methane carbon monoxide gaseous naphtha

34. Which of the following environmental problems is NOT caused by excessive burning of fossil fuels? A. B. C. D.

the corrosion of marble statues the formation of smog a higher incidence of liver diseases global warming

35. Which of the following statements concerning propene is correct?

30. Which of the following reactions is involved in this experiment ?

A. It can be converted by catalytic hydration to an alkanol with molecular formula C3H8O. B. It can undergo condensation polymerization.

MC : Fossil Fuels

Page 5

C. It can be manufactured by fractional distillation of crude oil. D. It can undergo substitution reaction with a solution of bromine in 1,1,1-trichloroethane. 36. The diagram below shows a catalytic converter fitted to the exhaust system of a car. n a p h th a

X

Y

n a p h th a

X

Y

D. a ir g a s e s fro m c a r e n g in e

Which of the following pollutants from the car engine undergo reactions in the catalytic converter to produce less harmful products? (1) carbon monoxide (2) hydrocarbons (3) nitrogen monoxide A. B. C. D.

39. Which of the following statements concerning the compounds C2H4, C3H6 and C4H10 is correct?

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

37. The use of leaded petrol has been banned in Hong Kong. Lead compounds in car exhaust can cause damage to human brains. 38. Consider the following manufacturing process: naphtha

cracking

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. They belong to the same homologous series. B. They are unsaturated hydrocarbons. C. They are gases at room temperature and pressure. D. They have the same physical properties. 1999 40. Which of the following combinations is INCORRECT? A. B. C. D.

A.

Pollutant Hydrocarbons Carbon monoxide Lead compounds Carbon particles

Harmful effect Causing liver disease Causing unconsciousness Causing brain damage Causing respiratory diseases

41. The label below is displayed on a container for chemical X:

n a p h th a

X

Y

B. Which of the following chemicals may X be? (1) bromochlorodifluoromethane (2) ethanol (3) potassium n a p h th a

C.

X

Y

A. B. C. D.

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

MC : Fossil Fuels

Page 6

42. Which of the following statements concerning the reaction of an alkane with bromine are correct? (1) The reaction occurs faster under sunlight than in darkness. (2) The reaction is a substitution reaction. (3) The colour of the reaction mixture fades. A. B. C. D.

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

48. Which of the following measures can reduce the emission of pollutants from a coal-fired power station?

43. Water-type fire extinguisher is suitable for putting out a fire caused by kerosene. Water can cut off the supply of oxygen for a fire caused by kerosene.

44. Which of the following statements concerning members of a homologous series is INCORRECT? A. They contain carbon and hydrogen only. B. They can be represented by the same general formula. C. They have similar chemical properties. D. Their boiling points increase with their relative molecular masses. 45. Which of the following processes is endothermic? A. cracking of petroleum fractions B. fermentation of glucose solution C. manufacture of ammonia by the Haber Process D. oxidation of sulphur dioxide to sulphur trioxide in the Contact Process 46. Which of the following combinations is correct?

A. B. C. D.

Electrical fire Electrical fire Kerosene fire Kerosene fire

(1) installation of scrubbers (2) installation of electrostatic precipitators (3) increasing the height of the chimney A. (1) and (2) only B. (1) and (3) only C. (2) and (3) only D. (1), (2) and (3) 49. Which of the following statements concerning carbon, silicon and phosphorus are correct? (1) Carbon forms numerous compounds with hydrogen and oxygen. (2) Silicon is used to make computer chips. (3) Phosphorus is an essential element for plant growth.

2000

Type of fire

A. Nitrogen monoxide changes to nitrogen dioxide. B. Carbon monoxide changes to carbon dioxide. C. Unburnt hydrocarbons changes to carbon particles. D. Sulphur changes to sulphur dioxide.

Type of fire extinguisher to use Water Foam Water Foam

47. Which of the following changes occurs in a catalytic converter installed in a motor car?

A. B. C. D.

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