30 2007ii26 which of the following statements

30. 2007/II/26
Which of the following statements concerning the measures to reduce air pollutants is/are correct?
(1) Scrubber can be used to reduce carbon monoxide
(2) Catalytic converter can be used to reduce nitrogen monoxide
(3) Electrostatic precipitator can be used to reduce unburnt hydrocarbons
A. (1) only B. (2) only C. (1) and (3) only D. (2) and (3) only
31. 2008/II/1
Which of the following statements concerning acid rain is INCORRECT?
A. Acid rain refers to rain with pH less than 5.6
B. Acid rain corrode iron window frames and marble buildings
C. One major air pollutants that causes the formation of acid rain is carbon dioxide
D. Acid rain will be formed when the gases discharged by power stations using fossil fuels enter
the atmosphere
HKCEE CHEMISTRY | 7.4 Consequences of using fossil fuels | P.6

139
1. 1990/II/34
What is the total number of isomer for an alkanol having the chemical formula C
4
H
9
OH?
A. 2 B. 3 C. 4 D. 5
2 . 1990/II/39
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. oxidation B. hydrolysis C. fermentation D. esterification
3 . 1991/II/30
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
A. (1) only B. (2) only C. (1) and (3) only D. (2) and (3) only
4. 1992/II/20
Which of the following compounds does not react with propan-1-ol?
A. sodium (Out of syll.) B. bromine water
C. acidified potassium permanganate solution D. ethanoic acid
5. 1992/II/41
A compound, C
2
H
4
O
2
, 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)
HKCEE CHEMISTRY | 7.5 Alkanol, alkanoic acid and ester | P.1

140
6. 1993/II/30
Q.6 and Q.7 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 equilibrium was reached. The resulting mixture M was then transferred to flask Y and heated as shown
below:
What is the function of the piece of apparatus labeled 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
D. to prevent the loss of the reactants in M due to evaporation
7. 1993/II/31
The first fraction of the distillate collected in flask Z is mainly
A. methanol B. propan-1-ol C. methanoic acid D. propanoic acid
8. 1994/II/19
Which of the following substances can turn a acidified solution of potassium permanganate colourless?