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SECTION 5
FOSSIL FUELS
1986
45. In the above experiment, X can be (1) crude oil. (2) propan-1-ol. (3) medicinal paraffin. A (1) only B (2) only C (1) & (3) only D (1), (2) & (3)
A B C D
(1) only (2) only (1) & (3) only (2) & (3) only
47. Which of the following would be present in a higher concentration inside the Cross Harbour Tunnel than in the atmosphere? (1) carbon monoxide (2) carbon dioxide (3) nitrogen dioxide (4) lead compounds A (1) & (2) only B (1), (3) & (4) only C (2), (3) & (4) only D (1), (2), (3) & (4) 1988
18. Liquefied petroleum gas (LPG) consists mainly of A butane. B carbon monoxide. C hydrogen. D methane.
48. Which of the following statements is/are true for an endothermic reaction? (1) The reaction absorbs heat from the surroundings. (2) The temperature of the reaction decreases as the reaction proceeds. (3) The energy of the products is higher than that of the reactants. A (1) only B (1) & (2) only C (2) & (3) only D (1), (2) & (3)
46. C3H8(g) + 2 Br2(g) → C3H6Br2(l) + 2 HBr(g) The above reaction can be classified as (1) an addition reaction. (2) a substitution reaction. (3) a redox reaction.
50. Which of the following would NOT reduce the amount of pollutants in the atmosphere? A reducing the lead content of gasoline
1987
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B C D
using fuels of low sulphur content building tall chimneys for factories and incinerators installing filters and electrostatic precipitators in factory and incinerator chimneys
1989
H H Br H H C C C C H 24.
50. 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. D It is the main component of local town gas. 1990 6.
1991
The boiling points of some hydrocarbons are given in the table below: Hydrocarbon Boiling point (°C)
Ethane -89
Ethene -104
Propene -48
If a mixture of these three hydrocarbons at -110 °C is allowed to warm up gradually to -80 °C, 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. 18. 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.
Br H The IUPAC name for the above compound is A 3-dibromobut-1-ene. B 2-dibromobut-4-ene. C 3,3-dibromobut-1-ene. D 2,2-dibromobut-4-ene.
25. Which of the following statements about structural isomers is correct? A They have the same molecular formula but different empirical formulae. B They have the same molecular formula but different structural formulae. C They have the same empirical formula but different molecular formulae. D They have the same empirical formula but different structural formulae.
34. 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 B (3) only
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C D
(1) & (2) only (1) & (3) only
36. Equal moles of chlorine and methane are allowed to react in diffused sunlight. Which of the following statements concerning the reaction is/are correct? (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) & (2) only C (1) & (3) only
A B C D
Process fractional distillation fractional distillation cracking cracking
X an alkane an alkene an alkane an alkene
33. 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.
1992 6.
0.01 mol of C2H5OH is burnt completely in oxygen. What are the numbers of moles of carbon dioxide and water formed respectively? carbon dioxide water A 0.01 0.03 B 0.02 0.03 C 0.02 0.06 D 0.04 0.06
24. Which of the following statements concerning CH3CH3, CH3CH2CH3 and CH3CH(CH3)CH3 is correct? 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. 1993 heat 29. C10H22 catalyst, → C6H14 + 2 X In the above process, which of the following combinations is correct?
1994 Direction: Questions 22 and 23 refer to the following diagram which shows a fractionating column of an oil refinery.
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40. Compounds X and Y have the following structures:
Which of the following statements about compounds X and Y are correct? (1) They have the same boiling point. (2) They belong to the same homologous series. (3) They are isomers. A (1) & (2) only B (1) & (3) only C (2) & (3) only D (1), (2) & (3) 22. Which of the following fractions is NOT cracked to produce more useful products? A P B R C S D T
23. Which of the following statements is correct? A Fraction P has the highest boiling point. B Fraction T is used for surfacing roads. C Fraction U is the least viscous. D Fraction S burns with a more sooty flame than fraction Q.