Section 5 / Sect5pp.doc / S. W. Tse / P.1
85 Q.22
Which of the following hydrocarbons would most probably be present in petrol?
A.
C.
C2H6
C4H10
B.
D.
C4H8
C6H14
86 Q.45
glass wool
soaked with X
heat
broken porcelain
gas(es) that
decolorize(s)
acidified KMnO4
heat
In the above experiment, X can be
(1) crude oil.
(2) propan-1-ol.
(3) medicinal paraffin.
A.
C.
(1) only
(1) and (3) only
B.
D.
(2) only
(1), (2) and (3) only
87 Q.18
Liquefied petroleum gas (LPG) consists mainly of
A.
C.
butane.
hydrogen.
B.
D.
carbon monoxide.
methane.
87 Q.27
The following is a series reactions starting from ethanol:
reagent A
Na2CO3(aq)
ethanol
P
CO2(g) + Q
Which of the following correctly describes the nature of reagent A and the product Q?
A.
B.
C.
D.
Reagent A
dehydrating agent
dehydrating agent
oxidizing agent
oxidizing agent
Product Q
ethene
ethane
sodium ethanoate
ethanoic acid
Section 5 / Sect5pp.doc / S. W. Tse / P.2
87 Q.36
Cracking is an important process in the
petroleum industry.
1st statement
A.
True
B.
True
C.
True/False
D.
False
2nd statement
True
True
False/True
False
Cracking can separate the light fractions of
crude oil from the heavy fractions.
2nd statement is a correct explanation of the 1st one.
2nd statement is NOT a correct explanation of the 1st one.
Only ONE of the statements is true, the other is false.
-----
87 Q.44
Which of the following molecular formulae can have isomeric structures?
(1) C2H3Cl
(2) C3H8O
(3) C4H8
A.
C.
(1) and (2) only
(2) and (3) only
B.
D.
(1) and (3) only
(1), (2) and (3)
87 Q.46
C3H8(g) + 2Br2(g) → C3H6Br2(l) + 2HBr(g)
The above reaction can be classified as
(1) an addition reaction.
(2) a substitution reaction.
(3) a redox reaction.
A.
C.
(1) only
(1) and (3) only
B.
D.
(2) only
(2) and (3) only
87 Q.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) and (2) only
B.
(1), (3) and (4) only
C. (2), (3) and (4) only
D.
(1), (2), (3) and (4)
88 Q.21
The number of structural isomers having the same molecular formula C4H9Br is
A.
C.
2.
4.
B.
D.
3.
5.
Section 5 / Sect5pp.doc / S. W. Tse / P.3
88 Q.50
Which of the following would NOT reduce the amount of pollutants in the atmosphere?
A.
B.
C.
D.
reducing the lead content of gasoline.
using fuels of low sulphur content.
building tall chimneys for factories and incinerators.
installing filters and electrostatic precipitators in factory and incinerator chimneys.
89 Q.49
Which of the following experimental procedures would NOT be carried out in the laboratory?
A.
B.
C.
D.
Cutting sodium metal with a knife under paraffin oil.
Adding a 1 cm3 piece of potassium metal to a beaker of 2M hydrochloric acid.
Adding concentrated sulphuric acid to copper(II) sulphate crystals in a test-tube using a
dropper.
Mixing bromine water with tetrachloromethane in a boiling tube.
90 Q.6
The boiling points of some hydrocarbons are given in the table below:
Hydrocarbon
Ethane
Ethene
Propene
o
Boiling point ( C)
-89
-104
-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.
B.
C.
D.
Ethene will remain in the liquid state.
Propene will remain in the liquid state.
Ethane and ethene will remain in the liquid state.
Ethane, ethene and propene will exist in the gaseous state.
90 Q.34
What is the total no. of isomers for an alkanol having the chemical formula C4H9OH?
A.
C.
2
4
B.
D.
3
5
90 Q.36
Which of the following tests can be used to distinguish between ethane and ethene?
(1) burning the gas in air
(2) bubbling the gas through bromine in tetrachloromethane
(3) bubbling the gas through acidified potassium permanganate solution
A.
C.
(1) and (2) only
(2) and (3) only
B.
D.
(1) and (3) only
(1), (2) and (3)
Section 5 / Sect5pp.doc / S. W. Tse / P.4
91 Q.24
The IUPAC name for
is
H
H
H Br H
C
C
C
C
H
Br H
A.
C.
3-dibromobut-1-ene.
3,3-dibromobut-1-ene.
B.
D.
2-dibromobut-4-ene.
2,2-dibromobut-4-ene.
91 Q.25
Which of the following statements about structural isomers is correct?
A.
B.
C.
D.
They have the same molecular formula but different empirical formulae.
They have the same molecular formula but different structural formulae.
They have the same empirical formula but different molecular formulae.
They have the same empirical formula but different structural formulae.
91 Q.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.
C.
(2) only
(1) and (2) only
B.
D.
(3) only
(1) and (3) only
91 Q.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 contains CH3Cl and HCl only.
(3) The final product contains CH3Cl, CH2Cl2, CHCl3, CCl4 and HCl.
A.
C.
(1) only
(1) and (2) only
B.
D.
(2) only
(1) and (3) only
92 Q.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.
Section 5 / Sect5pp.doc / S. W. Tse / P.5
92 Q.44
Which of the following pollutants are found in the exhaust from cars using petrol as fuel?
(1) CO
(2) SO2
(3) NO2
A. (1) and (2) only
B.
(1) and (3) only
C. (2) and (3) only
D.
(1), (2) and (3)
93 Q.29
catalyst
C10H22
C6H14 + 2X
heat
In the above process, which of the following combinations is correct?
Process
X
A. fractional distillation
an alkane
B. fractional distillation
an alkene
C. cracking
an alkane
D. cracking
an alkene
93 Q.32
Which of the following substances can react with propene?
(1) concentrated sodium hydroxide solution.
(2) acidified potassium permanganate solution
(3) ethanol
A.
C.
(1) only
(1) and (3) only
B.
D.
(2) only
(2) and (3) only
93 Q.33
Which of the following statements about fossils fuels is correct?
A.
B.
C.
D.
They are liquids or gases.
They are all formed from plants which died millions of years ago.
They can be recycled to help converse energy resources.
They cause air pollution when burnt.
93 Q.48
When car exhaust gases are bubbled into
citrated blood, the colour of the blood
gradually becomes cherry red.
A.
B.
C.
D.
1st statement
True
True
True/False
False
2nd statement
True
True
False/True
False
Nitrogen dioxide is present in car exhaust
gases.
2nd statement is a correct explanation of the 1st one.
2nd statement is NOT a correct explanation of the 1st one.
Only ONE of the statements is true, the other is false.
-----
Section 5 / Sect5pp.doc / S. W. Tse / P.6
Directions: Questions 94 Q.22 and 94 Q.23 refer to the following diagram which shows a
fractionating column of an oil refinery.
fraction P
fraction Q
fraction R
fraction S
vapour of
crude oil
fraction T
fraction U
94 Q.22
Which of the following fraction is NOT cracked to produce more useful products?
A.
C.
P
S
B.
D.
R
T
94 Q.23
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.
94 Q.40
Compounds X and Y have the following structures:
CH3
H H H
H
H
H C C C H
H C C C H
H H CH3
X
H H H
Y
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) and (2) only
B.
(1) and (3)only
C. (2) and (3) only
D.
(1), (2) and (3)
Section 5 / Sect5pp.doc / S. W. Tse / P.7
95 Q.15
The structural formula of a certain compound is shown below.
H
H C H
H
H
H C
C C H
H H OH
The name of this compound is
A.
C.
butan-1-ol.
2-methylpropan-1-ol
B.
D.
butan-2-ol
2-methylpropan-2-ol
95 Q.23
Which of the following substances can cause acid rain?
A.
B.
C.
D.
lead compounds from the burning of leaded petrol in motor cars
carbon dioxide from the complete combustion of town gas
carbon soots from the incomplete combustion of coal
nitrogen dioxide from the burning of fuels in power stations
95 Q.29
Which of the following compounds have the same empirical formula?
(1) ethene
(2) ethane
(3) propene
(4) propane
A. (1) and (2) only
B.
(1) and (3) only
C. (2) and (4) only
D.
(3) and (4) only
95 Q.42
Which of the following products may be formed from the cracking of heavy oil fraction?
(1) CO
(2) C2H4
(3) C8H18
A. (1) and (2) only
B.
(1) and (3) only
C. (2) and (3) only
D.
(1), (2) and (3)
95 Q.43
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. (1) and (2) only
B.
(1) and (3) only
C. (2) and (3) only
D.
(1), (2) and (3)
Section 5 / Sect5pp.doc / S. W. Tse / P.8
95 Q.48
Huge quantities of carbon dioxide produced
by the burning of fossil fuels cause the
greenhouse effect.
1st statement
A.
True
B.
True
C.
True/False
D.
False
2nd statement
True
True
False/True
False
Carbon dioxide can trap the solar energy
which is re-radiated from the earth‘s surface
to the atmosphere.
2nd statement is a correct explanation of the 1st one.
2nd statement is NOT a correct explanation of the 1st one.
Only ONE of the statements is true, the other is false.
-----
96 Q.20
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
96 Q.48
The cost of town gas goes up when the cost
of crude oil rises.
1st statement
A.
True
B.
True
C.
True/False
D.
False
2nd statement
True
True
False/True
False
Town gas is manufactured from naphtha.
2nd statement is a correct explanation of the 1st one.
2nd statement is NOT a correct explanation of the 1st one.
Only ONE of the statements is true, the other is false.
-----
97 Q.16
Which of the following compounds represents the first member of a homologous series?
A.
C.
ethane
ethanol
B.
D.
ethene
ethanoic acid
Section 5 / Sect5pp.doc / S. W. Tse / P.9
97 Q.18
The model shown below represents a compound containing 6 hydrogen atoms (white spheres)
and 3 carbon atoms (black spheres).
Which of the following statements concerning the compound is INCORRECT?
A. Its structural formula is C3H6.
B. It can be prepared by cracking petroleum fractions.
C. It can decolourize bromine in 1,1,1-trichloroethane.
D. It can undergo polymerization.
97 Q.19
Which of the following compounds CANNOT be produced directly from ethene?
A. carbon dioxide
B.
ethanol
C. ethyl ethanoate
D.
1,2-dibromoethane
Directions: 97 Q.23 and Q.24 refer to the following experiment:
broken porcelain
delivery tube
rocksil soaked with
medicinal paraffin
heat
97 Q.23
Which of the following set-up should be connected to the delivery tube to collect the gaseous
products formed?
A.
B.
C.
D.
ice
Section 5 / Sect5pp.doc / S. W. Tse / P.10
97 Q.24
Which of the following reaction is involved in this experiment?
A.
C.
cracking
catalytic hydration
B.
D.
redox
destructive distillation
97 Q.33
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.
C.
(1) only
(1) and (3) only
B.
D.
(2) only
(2) and (3) only
97 Q.38
Which of the following statements about 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 fuel.
A.
C.
(1) and (2) only
(2) and (3) only
B.
D.
(1) and (3) only
(1), (2) and (3)
97 Q.42
Which of the following measures can reduce the formation of acid rain?
(1) installing catalytic oxidizers in cars
(2) using unleaded petrol in cars
(3) using fuels of low sulphur content in cars
A.
C.
(1) and (2) only
(2) and (3) only
B.
D.
(1) and (3) only
(1), (2) and (3)
98 Q.3
Which of the following substances is the main constituent of town gas?
A.
C.
hydrogen
carbon monoxide
B.
D.
methane
gaseous naphtha
98 Q.7
Which of the following environmental problems is NOT caused by excessive burning of fossil
fuels?
A.
C.
the corrosion of marble statues
a higher incidence of liver diseases
B.
D.
the formation of smog
global warming
Section 5 / Sect5pp.doc / S. W. Tse / P.11
98 Q.17
Which of the following statements concerning the compounds C2H4, C3H6 and C4H10 is
correct?
A.
C.
They belong to the same homologous
series.
They are gases at room temperature and
pressure.
B.
They are unsaturated hydrocarbons.
D.
They have the same physical properties.
98 Q.29
X is a compound containing four carbon atoms. It gives negative results with the following
tests.
The structural formula of X may be
A.
B.
C.
D.
98 Q.39
The diagram below shows a catalytic converter fitted to the exhaust system of a car.
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.
C.
(1) and (2) only
(2) and (3) only
B.
D.
(1) and (3) only
(1), (2) and (3)
Section 5 / Sect5pp.doc / S. W. Tse / P.12
98 Q.47
The use of leaded petrol has been banned in
Hong Kong.
1st statement
A.
True
B.
True
C.
True/False
D.
False
2nd statement
True
True
False/True
False
Lead compounds in car exhaust can cause
damage to human brains.
2nd statement is a correct explanation of the 1st one.
2nd statement is NOT a correct explanation of the 1st one.
Only ONE of the statements is true, the other is false.
-----
99 Q.30
Which of the following combinations is INCORRECT?
A.
B.
C.
D.
Pollutant
hydrocarbons
carbon monoxide
lead compounds
carbon particles
Harmful effect
causing liver diseases
causing unconsciousness
causing brain damage
causing respiratory diseases
99 Q.32
Which of the following substances can react with acidified potassium permanganate solution?
(1) ethene
(2) copper(II) sulphate solution
(3) iron(II) sulphate solution
A.
C.
(1) only
(1) and (3) only
B.
D.
(2) only
(2) and (3) only
99 Q.44
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.
C.
(1) and (2) only
(2) and (3) only
B.
D.
(1) and (3) only
(1), (2) and (3)
99 Q.49
Water-type fire extinguisher is suitable
Water can cut off the supply of oxygen
for putting out a fire caused by kerosene.
for a fire caused by kerosene.
1st statement 2nd statement
A.
True
True
2nd statement is a correct explanation of the 1st one.
B.
True
True
2nd statement is NOT a correct explanation of the 1st one.
C.
True/False
False/True
Only ONE of the statements is true, the other is false.
D.
False
False
-----
Section 5 / Sect5pp.doc / S. W. Tse / P.13
00 Q.6
Which of the following pairs of compounds can be distinguished by treating with an acidified
potassium dichromate solution?
A.
C.
ethane and ethene
sodium carbonate and sodium
hydrogencarbonate
B.
D.
ethanol and propan-l-ol
sodium sulphite and sodium sulphate
00 Q.8
Which of the following statements concerning members of a homologous series is
INCORRECT?
A.
B.
C.
D.
They contain carbon and hydrogen only.
They can be represented by the same general formula.
They have similar chemical properties.
Their boiling points increase with their relative molecular masses.
00 Q.26
Which of the following combinations is correct?
A.
B.
C.
D.
Type of fire
electrical fire
electrical fire
kerosene fire
kerosene fire
Type of fire extinguisher to use
water
foam
water
foam
00 Q.27
Which of the following changes occurs in a catalytic converter installed in a motor car?
A.
B.
C.
D.
Nitrogen monoxide changes to nitrogen dioxide.
Carbon monoxide changes to carbon dioxide.
Unburnt hydrocarbons change to carbon particles.
Sulphur changes to sulphur dioxide.
00 Q.40
Which of the following measures can reduce the emission of pollutants from a coal-fired power
station?
(1) installation of scrubbers
(2) installation of electrostatic precipitators
(3) increasing the height of the chimney
A.
C.
(1) and (2) only
(2) and (3) only
B.
D.
(1) and (3) only
(1), (2) and (3)
Section 5 / Sect5pp.doc / S. W. Tse / P.14
01 Q.14
Which of the following pairs is correctly matched?
A.
B.
C.
D.
Pollutant
carbon monoxide
sulphur dioxide
lead compounds
unburnt hydrocarbons
Effect
global warming
darkening of building walls
liver disease
lung cancer
01 Q.32
The formulae of three straight-chain hydrocarbons are listed below:
(1) C2H6
(2) C3H6
(3) C4H8
Which of these hydrocarbons is/are unsaturated?
A.
C.
(1) and (2) only
(2) and (3) only
B.
D.
(1) and (3) only
(1), (2) and (3)
02 Q.9
Which of the following equations represents a cracking reaction?
A.
B.
C.
D.
C4H8 +H2 → C4H10
C4H10 → C3H6 + CH4
C6H12O6 → 2C2H5OH + 2CO2
C4H9OH → C4H8 + H2O
02 Q.11
Which of the following petroleum fractions has supply that outweighs the demand in modern
society?
A.
C.
fuel gases
Petrol
B.
D.
kerosene
heavy oil
02 Q.34
Upon complete combustion, gaseous hydrocarbon X gives an equal number of moles of carbon
dioxide and water. Which of the following hydrocarbons may X be?
(1) ethane
(2) ethene
(3) propene
A.
C.
(1) only
(1) and (3) only
B.
D.
(2) only
(2) and (3) only
Section 5 / Sect5pp.doc / S. W. Tse / P.15
02 Q.40
Which of the following gasses can cause global warming?
(1)
(2)
(3)
A.
C.
methane
carbon dioxide
chlorofluorocarbons
(1) and (2) only
(2) and (3) only
B.
D.
(1) and (3) only
(1), (2) and (3)
02 Q.44
Both ethene and ethyne are gaseous hydrocarbons. Their structures are shown below:
Which of the following statements concerning ethene and ethyne are correct?
(1)
(2)
(3)
A.
C.
Both are unsaturated hydrocarbons.
Both are insoluble in water.
Ethyne burns with a more sooty frame than ethene.
(1) and (2) only
(2) and (3) only
B.
D.
02 Q.50
A foam extinguisher is suitable for putting
out electrical fires.
1st statement
A.
True
B.
True
C.
True/False
D.
False
2nd statement
True
True
False/True
False
The foam from a foam extinguisher is an
electrical insulator.
2nd statement is a correct explanation of the 1st one.
2nd statement is NOT a correct explanation of the 1st one.
Only ONE of the statements is true, the other is false.
-----
03 Q.8
Which of the following combinations is correct?
A.
B.
C.
D.
Homologous series
alkanes
alkenes
alkanols
alkanoic acids
(1) and (3) only
(1), (2) and (3)
General formula
CnH2n
CnH2n+2
CnH2nOH
CnH2n+1CO2H
Section 5 / Sect5pp.doc / S. W. Tse / P.16
03 Q.33
Ethane reacts with bromine under suitable conditions. Which of the following statements
concerning this reaction is/are correct?
(1)
(2)
(3)
A.
C.
The reaction occurs readily in the dark.
The reaction is a substitution.
The reaction gives a mixture of organic products.
(1) only
(1) and (3) only
B.
D.
(2) only
(2) and (3) only
03 Q.37
Which of the following statements concerning the manufacture of town gas in Hong Kong
is/are correct?
(1)
(2)
(3)
A.
C.
Town gas is produced from coal.
Town gas contains hydrogen as the major component.
Oxygen is added to enhance the flammability of town gas prior to its delivery to
consumers.
(1) only
(1) and (3) only
B.
D.
(2) only
(2) and (3) only
Section 5 / Sect5pp.doc / S. W. Tse / P.17
M.C. Answer
85
22
94
22
23
40
03
8
33
37
D
A
D
C
86
45
95
15
23
29
42
43
48
D
C
D
B
C
B
A
87
18
27
36
44
46
47
96
20
48
A
C
C
C
D
D
D
A
88
21
50
97
16
18
19
23
24
33
38
42
C
C
B
A
C
D
A
D
D
B
89
49
98
3
7
17
29
39
47
B
A
C
C
D
D
C
90
6
34
36
99
30
32
44
49
B
C
C
91
24
25
34
36
A
C
D
D
00
6
8
26
27
40
C
B
A
D
D
A
D
B
A
92
24
44
01
14
32
A
B
D
D
93
29
32
33
48
D
B
D
B
02
9
11
34
40
44
50
B
D
D
D
D
D