2002-CE
CHEM
2
HONG KONG EXAMINATIONS AUTHORITY
HONG KONG CERTIFICATE OF EDUCATION EXAMINATION 2002
CHEMISTRY PAPER 2
10.45 am – 11.45 am (1 hour)
Subject Code 160
1.
Read carefully the instructions on the Answer Sheet and insert the information
required (including the Subject Code) in the spaces provided.
2.
When told to open this book, you should check that all the questions are there.
Look for the words ‘END OF PAPER’ after the last question.
3.
All questions carry equal marks.
4.
ANSWER ALL QUESTIONS. You should mark all your answers on the
Answer Sheet.
5.
You should mark only ONE answer for each question. If you mark more than
one answer, you will receive NO MARKS for that question.
6.
No marks will be deducted for wrong answers.
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2002-CE-CHEM 2–1
There are 50 questions in this paper. Choose the best answer for each question.
1.
The electronic diagram of an atom of element X is shown below :
X
(Only electrons in the outermost shell are shown.)
The atomic number of X is probably
A.
B.
C.
D.
2.
Which of the following compounds, when dissolved in water, gives a green
solution ?
A.
B.
C.
D.
3.
7.
15.
17.
19.
copper(II) sulphate
nickel(II) sulphate
cobalt(II) chloride
iron(III) sulphate
An oxide of element X has the formula X2O3. 10.2 g of this oxide contains
5.4 g of X. What is the relative atomic mass of X ?
(Relative atomic mass : O = 16.0)
A.
B.
C.
D.
4.
12.0
18.0
27.0
36.0
Which of the following statements concerning drugs is INCORRECT ?
A.
B.
C.
D.
Acetylsalicylate can cause addiction.
Magnesium hydroxide can reduce stomach disturbance.
Codeine can alleviate coughing.
Morphine can relieve pain.
2002-CE-CHEM 2-2
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5.
Consider the aqueous solutions listed below :
(1)
(2)
(3)
1M ethanoic acid
1M hydrochloric acid
1M ammonia solution
Which of the following represents the increasing order of pH of the
solutions ?
A.
B.
C.
D.
6.
Compound X dissolves in water to give a colourless solution. When
chlorine gas is bubbled into the solution, the solution turns brown. X is
probably
A.
B.
C.
D.
7.
(1), (2), (3)
(2), (1), (3)
(3), (1), (2)
(3), (2), (1)
ammonium iodide.
iron(II) sulphate.
sodium sulphite.
potassium hydroxide.
Sodium chromate, Na2CrO4 , dissolves in water to give a yellow solution.
When dilute hydrochloric acid is added to the solution, the following
reaction occurs :
2CrO42–(aq) + 2H+(aq) → Cr2O72–(aq) + H2O(l)
Which of the following statements concerning this reaction is correct ?
A.
B.
C.
D.
The colour of the solution changes from yellow to green.
Chromate ions act as a reducing agent.
The oxidation number of oxygen remains unchanged
during the reaction.
The reaction is a neutralization.
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8.
Which of the following statements concerning aluminium is correct ?
A.
B.
Aluminium is used to make stainless steel.
The strength of aluminium can be enhanced by
anodization.
Aluminium is the most abundant element in the earth’s
crust.
When aluminium is exposed to air, a layer of aluminium
oxide is formed on its surface.
C.
D.
9.
Which of the following equations represents a cracking reaction ?
C4H8 + H2 → C4H10
C4H10 → C3H6 + CH4
C6H12O6 → 2C2H5OH + 2CO2
C4H9OH → C4H8 + H2O
A.
B.
C.
D.
10.
Consider the set-up shown below :
V
electron flow
salt bridge
X
Y
zinc sulphate
solution
Z
Electrons flow from X to Y in the external circuit. Which of the following
combinations is correct ?
A.
B.
C.
D.
X
Y
carbon
zinc
carbon
zinc
silver
magnesium
carbon
carbon
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Z
silver nitrate solution
magnesium sulphate solution
copper(II) sulphate solution
silver nitrate solution
11.
Which of the following petroleum fractions has a supply that outweighs the
demand in modern society ?
A.
B.
C.
D.
12.
Which of the following reactions does NOT require the use of a catalyst ?
A.
B.
C.
D.
13.
conversion of ammonia to nitrogen monoxide
hydration of ethene to give ethanol
oxidation of ethanol to ethanoic acid
fermentation of glucose to give ethanol
Which of the following equations represents a redox reaction ?
A.
B.
C.
D.
14.
fuel gases
kerosene
petrol
heavy oil
Ca(HCO3)2 + 2HCl → CaCl2 + 2CO2 + 2H2O
PCl3 + Cl2 → PCl5
Fe3+ + 3OH– → Fe(OH)3
Al2O3 + 2NaOH → 2NaAlO2 + H2O
Ammonium dichromate, (NH4)2Cr2O7 , decomposes on heating to give
chromium(III) oxide, water and nitrogen. What mass of water is obtained
when 126 g of ammonium dichromate undergoes complete decomposition ?
(Relative atomic masses : H = 1.0, N = 14.0, O = 16.0, Cr = 52.0)
A.
B.
C.
D.
9g
18 g
36 g
72 g
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15.
Which of the following combinations concerning the functions of food
additives is correct ?
Food additive
A.
B.
C.
D.
16.
sulphur dioxide in wine
sodium chloride in potato chips
sodium benzoate in oyster sauce
monosodium glutamate in instant noodles
Function
flavour enhancer
flavouring
colouring
antioxidant
Gases X and Y react to give a gaseous product Z. The reaction can be
represented by the equation :
X(g) + 3Y(g) → 2Z(g)
In an experiment, 40 cm3 of X and 60 cm3 of Y are mixed and are allowed
to react in a closed vessel. What is the volume of the resultant gaseous
mixture ?
(All volumes are measured at room temperature and pressure.)
A.
B.
C.
D.
17.
Which of the following solutions does NOT react with sodium hydroxide
solution ?
A.
B.
C.
D.
18.
40 cm3
60 cm3
80 cm3
100 cm3
ammonium chloride solution
potassium carbonate solution
copper(II) nitrate solution
zinc sulphate solution
The symbol of vanadium is V. What is the oxidation number of vanadium
in NH4VO3 ?
A.
B.
C.
D.
–1
+3
+5
+6
2002-CE-CHEM 2-6
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19.
Which of the following acids, when heated with copper, would produce a
gas ?
A.
B.
C.
D.
20.
dilute nitric acid
dilute hydrochloric acid
dilute sulphuric acid
concentrated ethanoic acid
The monomer of polymer X is chloroethene.
statements concerning X is correct ?
A.
B.
C.
D.
Which of the following
X is a condensation polymer.
X is a thermosetting plastic.
X is used in making drainage pipes.
The repeating unit of X is as follows :
Cl Cl
21.
C
H
H
In a boiler using hard water, scale is deposited on its interior after a period
of time. The scale consists mainly of metal carbonates. Which of the
following substances can be used to remove the boiler scale ?
A.
B.
C.
D.
22.
C
soapless detergent
chlorine bleach
sodium hydroxide solution
vinegar
Which of the following methods should be used to obtain hydrated
copper(II) sulphate from copper(II) sulphate solution ?
A.
B.
C.
D.
crystallization
distillation
fractional distillation
heating under reflux
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23.
Which of the following gases contains the greatest number of molecules at
room temperature and pressure ?
(Relative atomic masses : H = 1.0,
A.
B.
C.
D.
24.
It is manufactured by treating sodium with water.
Its concentrated solution is corrosive.
It is used in the manufacture of soapless detergents.
It absorbs carbon dioxide when exposed to air.
Which of the following statements concerning the Haber process is
INCORRECT ?
A.
B.
C.
D.
26.
2.0 g of hydrogen
16.0 g of oxygen
18.0 g of ammonia
60.0 g of chlorine
Which of the following statements concerning sodium hydroxide is
INCORRECT ?
A.
B.
C.
D.
25.
N = 14.0, O = 16.0, Cl = 35.5)
Nitrogen and hydrogen undergo complete reaction in the
reaction chamber.
Nitrogen and hydrogen are compressed to about 200 atm
before they are allowed to undergo reaction.
The process is operated at about 500°C.
The reaction between nitrogen and hydrogen is
exothermic.
When a piece of copper is dropped into an aqueous solution of compound X,
the copper gradually dissolves. X is probably
A.
B.
C.
D.
magnesium chloride.
lead(II) nitrate.
silver nitrate.
ammonium chloride.
2002-CE-CHEM 2-8
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27.
Which of the following objects is least likely to contain titanium ?
A.
B.
C.
D.
28.
Which of the following substances does not conduct electricity in its solid
state but does conduct electricity in its liquid state ?
A.
B.
C.
D.
29.
lithium chloride
phosphorus
platinum
perspex
In which of the following substances are the molecules furthest apart from
each other at room temperature and pressure ?
A.
B.
C.
D.
30.
missile
water tap
bicycle frame
artificial hip joint
butane
water
propan-1-ol
iodine
Starch, a natural polymer, is a carbohydrate. When concentrated sulphuric
acid is added dropwise to some starch, a black substance is formed. The
reaction involved is
A.
B.
C.
D.
dehydration.
depolymerization.
redox reaction.
neutralization.
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31.
A part of the flow diagram for the Contact process is shown below :
Y
SO2
reaction
chamber
absorption
tower
Z
X
Which of the following combinations is correct ?
A.
B.
C.
D.
32.
X
Y
Z
air
air
oxygen
oxygen
water
concentrated sulphuric acid
sulphur trioxide
water
concentrated sulphuric acid
oleum
concentrated sulphuric acid
oleum
A black powder is suspected to be carbon or a mixture of carbon and
copper(II) oxide. Which of the following methods can be used to identify
the black powder ?
(1)
(2)
(3)
adding dilute sulphuric acid to the powder
adding sodium hydroxide solution to the powder
heating the powder strongly
A.
B.
C.
D.
33.
(1) only
(2) only
(1) and (3) only
(2) and (3) only
Which of the following reactions is/are endothermic ?
(1)
(2)
(3)
the fermentation of glucose
the cracking of naphtha
the reaction of lime with dilute hydrochloric acid
A.
B.
C.
D.
(1) only
(2) only
(1) and (3) only
(2) and (3) only
2002-CE-CHEM2-10
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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)
(2)
(3)
ethane
ethene
propene
A.
B.
C.
D.
35.
A student heated a mixture of fat and sodium hydroxide solution for some
time. He then added the mixture to a beaker of saturated sodium chloride
solution. A white solid was formed. Which of the following statements
concerning this experiment is/are correct ?
(1)
(2)
(3)
The reaction between fat and sodium hydroxide is esterification.
The white solid is a soap.
The white solid contains salts of alkanoic acids.
A.
B.
C.
D.
36.
(1) only
(2) only
(1) and (3) only
(2) and (3) only
(1) only
(2) only
(1) and (3) only
(2) and (3) only
Which of the following statements concerning fluorine is/are correct ?
(1)
(2)
(3)
It exists as monatomic molecules.
It reacts with hydrogen to form a covalent compound.
It reacts with calcium to form a compound with the formula CaF2.
A.
B.
C.
D.
(1) only
(2) only
(1) and (3) only
(2) and (3) only
2002-CE-CHEM 2-11
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37.
Which of the following methods can be used to distinguish between iron(II)
sulphate solution and iron(III) sulphate solution ?
(1)
(2)
(3)
observing their colours
adding acidified potassium permanganate solution
adding aqueous ammonia
A.
B.
C.
D.
38.
(1) and (2) only
(1) and (3) only
(2) and (3) only
(1) , (2) and (3)
Which of the following set-ups can be used to dry moist sulphur dioxide
gas ?
(1)
(2)
gas
anhydrous calcium
chloride
gas
calcium
oxide
(3)
gas
concentrated
sulphuric acid
A.
B.
C.
D.
(1) and (2) only
(1) and (3) only
(2) and (3) only
(1), (2) and (3)
2002-CE-CHEM 2-12
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39.
Which of the following statements concerning Group VII elements and their
ions are correct ?
(1)
(2)
(3)
Chlorine has the highest oxidizing power among chlorine, bromine
and iodine.
Iodide ions have the highest reducing power among chloride,
bromide and iodide ions.
Bromine is a volatile liquid at room temperature and pressure.
A.
B.
C.
D.
40.
Which of the following gases can cause global warming ?
(1)
(2)
(3)
methane
carbon dioxide
chlorofluorocarbons
A.
B.
C.
D.
41.
(1) and (2) only
(1) and (3) only
(2) and (3) only
(1), (2) and (3)
(1) and (2) only
(1) and (3) only
(2) and (3) only
(1), (2) and (3)
When sulphur dioxide is bubbled into water, a colourless solution is formed.
Which of the following statements concerning the solution are correct ?
(1)
(2)
(3)
The solution conducts electricity better than water.
The solution can change iron(III) sulphate solution from yellow to
green.
The solution can change potassium bromide solution from
colourless to brown.
A.
B.
C.
D.
(1) and (2) only
(1) and (3) only
(2) and (3) only
(1), (2) and (3)
2002-CE-CHEM 2-13
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42.
In which of the following is ammonia used ?
(1)
(2)
(3)
the manufacture of nitric acid
the making of fertilizers
the making of antiacids
A.
B.
C.
D.
43.
(1) and (2) only
(1) and (3) only
(2) and (3) only
(1), (2) and (3)
In which of the following processes will carbon dioxide be produced ?
(1)
(2)
(3)
the fermentation of glucose solution
the biodegradation of animal faeces
the treatment of car exhaust in a catalytic converter
A.
B.
C.
D.
44.
(1) and (2) only
(1) and (3) only
(2) and (3) only
(1), (2) and (3)
Both ethene and ethyne are gaseous hydrocarbons. Their structures are
shown below :
H
H
C
C
H
H
C
C
H
H
ethene
ethyne
Which of the following statements concerning ethene and ethyne are
correct ?
(1)
(2)
(3)
Both are unsaturated hydrocarbons.
Both are insoluble in water.
Ethyne burns with a more sooty flame than ethene.
A.
B.
C.
D.
(1) and (2) only
(1) and (3) only
(2) and (3) only
(1), (2) and (3)
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Directions : Each question below (Question Nos. 45 to 50) consists of two
separate statements. Decide whether each of the two statements is
true or false; if both are true, then decide whether or not the second
statement is a correct explanation of the first statement. Then select
one option from A to D according to the following table :
A. Both statements are true and the 2nd statement is a correct explanation of the
1st statement.
B. Both statements are true but the 2nd statement is NOT a correct explanation of
the 1st statement.
C. The 1st statement is false but the 2nd statement is true.
D. Both statements are false.
1st statement
2nd statement
45. Nitrogen monoxide is a gas at room
temperature and pressure.
Nitrogen monoxide is a covalent
compound.
46. Combustion of diamond gives
carbon dioxide.
Diamond is a crystalline form of
carbon.
47. During electrolysis, oxidation takes
place at the cathode.
Cations accept electrons and are
discharged at the cathode.
48. The basicity of methanoic acid is
different from that of ethanoic acid.
The number of hydrogen atoms in a
molecule of methanoic acid is
different from that in a molecule of
ethanoic acid.
49. When iodine sublimes, it absorbs
energy.
Energy is required to overcome the
attractive force between iodine
molecules.
50. A foam extinguisher is suitable for
putting out electrical fires.
The foam from a foam extinguisher
is an electrical insulator.
END OF PAPER
2002-CE-CHEM 2-15
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2002 Chemistry Paper 2
Question No.
Key
Question No.
Key
1.
2.
3.
4.
5.
C (86)
B (46)
C (68)
A (63)
B (72)
26.
27.
28.
29.
30.
C (66)
B (55)
A (77)
A (41)
A (81)
6.
7.
8.
9.
10.
A (74)
C (47)
D (74)
B (86)
D (44)
31.
32.
33.
34.
35.
B (47)
C (42)
B (64)
D (59)
D (32)
11.
12.
13.
14.
15.
D (60)
C (29)
B (50)
C (64)
B (72)
36.
37.
38.
39.
40.
D (65)
D (29)
B (31)
D (36)
D (28)
16.
17.
18.
19.
20.
B (25)
B (52)
C (66)
A (52)
C (59)
41.
42.
43.
44.
45.
A (34)
A (61)
D (57)
D (35)
B (69)
21.
22.
23.
24.
25.
D (38)
A (69)
C (56)
A (28)
A (64)
46.
47.
48.
49.
50.
A (42)
C (60)
C (46)
A (63)
D (66)
Note: Figures in brackets indicate the percentages of candidates choosing the
correct answers.
2002-CE-CHEM 2-16
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