- 1. 2000-CE CHEMHONG KONG EXAMINATIONS AUTHORITY2 HONG KONG
CERTIFICATE OF EDUCATION EXAMINATION 2000 CHEMISTRY PAPER 210.45 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, check that all the questions are there. Look for the words
END OF PAPER after the last question.ANSWER ALL QUESTIONS. 3. All
the answers should be marked on the Answer Sheet.Note that you may
only mark ONE answer to each question. 4. Two or more answers will
score NO MARKS.5.All questions carry equal marks. No marks will be
deducted for wrong answers. Hong Kong Examinations Authority All
Rights Reserved 2000 2000-CE-CHEM 21
2. There are 50 questions in this paper. 1.A compound formed
from element X and sulphur has the following electronic structure
:S S X(Only electrons in the outermost shells are shown.)How many
electrons are there in the outermost shell of an atom of X ? A. 2B.
4C. 6D. 8 2.Caesium (Cs) is a Group I element in the Periodic Table
and its relative atomic mass is greater than that of potassium.
Which of the following statements concerning caesium is INCORRECT ?
A. Caesium is a weaker reducing agent than potassium.B. Caesium
reacts violently with water.C. Caesium is a soft metal.D. Caesium
reacts with oxygen to form an oxide with formula Cs2O. 3.Iron cans
used for canning food are usually coated with tin instead of zinc.
This is because A. tin is more reactive than zinc.B. tin ions are
non-toxic but zinc ions are toxic.C. tin forms an alloy with iron
and this alloy is corrosion resistant.D. tin prevents iron cans
from rusting by sacrificial protection. 2000-CE-CHEM 221 All Rights
Reserved 2000 3. 4. Metal X forms an oxide. 27.53 g of this oxide
contains 24.96 g of X. Whatis the mole ratio of X to oxygen in the
oxide ? (Relative atomic masses : O = 16.0, X = 207.0)A. 1:1 B. 1:2
C. 2:3 D. 3:4 5. Which of the following gases are the major
products liberated in theelectrolysis of concentrated sodium
chloride solution using carbonelectrodes ? CathodeAnodeA. hydrogen
chlorine B. chlorine hydrogen C. hydrogen oxygen D. oxygen hydrogen
6. Which of the following pairs of compounds can be distinguished
by treatingwith an acidified potassium dichromate solution ?A.
ethane and ethene B. ethanol and propan-1-ol C. sodium carbonate
and sodium hydrogencarbonate D. sodium sulphite and sodium
sulphateElement X occurs in nature as two isotopes, 63X and 65X. If
the relative 7.atomic mass of X is 63.5, what is the relative
abundance of the 63X isotope ?A. 25% B. 60% C. 75% D. 90%Go on to
the next page 2000-CE-CHEM 232 All Rights Reserved 2000 4. 8. Which
of the following statements concerning members of a
homologousseries 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 molecularmasses. 9. The atomic number of
element X is 12. X reacts with element Y to forman ionic compound
with formula XY2. To which group of the PeriodicTable does Y belong
? A.Group IB.Group IVC.Group VID.Group VII 10.Manufacturing ammonia
by the Haber process involves the reversiblereaction : N2(g) +
3H2(g)2NH3(g) Which of thefollowing statements concerningthe
process isINCORRECT ? A.The forward reaction can go to completion
if iron powderis used as a catalyst.B.The optimum conditions for
the process are 500C and200 atm.C.The raw materials are derived
from air and water.D.The forward reaction and backward reaction
occursimultaneously. 2000-CE-CHEM 24 3 All Rights Reserved 2000 5.
11.Different volumes of 2.0 M potassium hydroxide solution and 2.0
Msulphuric acid are mixed in a polystyrene cup. In which of the
followingcombinations would the temperature rise be the greatest
?Volume of 2.0 M KOH(aq)/cm 3 Volume of 2.0 M H 2 SO 4 (aq)/cm 3
A.20.0 40.0B.30.0 30.0C.40.0 20.0D.45.0 15.0 12.Which of the
following natural substances is essentially a singlecompound ?A.
air B. coal C. petroleum D. quartz 13.Consider the compounds
represented by the two structures below :OHH HHOand H CO C C H HC
CC OHHH HH Which of the following statements concerning these
compounds is correct ?A. Both compounds can turn wet blue litmus
paper red. B. Both compounds have the same odour. C. Both compounds
have the same molecular formula. D. Both compounds have the same
boiling point.Go on to the next page 2000-CE-CHEM 25 4 All Rights
Reserved 2000 6. 14.Which of the following solutions can react with
bromine water to give acolourless solution ? A. sodium chloride
solutionB. sodium sulphite solutionC. sodium iodide solutionD.
sodium hypochlorite solution15.A polymer has the following
structure : CH3 CH3C Cn H H What is the monomer of this polymer ?
A. butaneB. but-1-eneC. but-2-eneD. 2-methylpropene16.Consider the
following equation :3Zn(s) + 2NO3(aq) + 8H+(aq) 3Zn2+(x) + 2NO(y) +
4H2O(z) Which of the following combinations is correct ?y xzA.
aqgaqB. aqgC. aqaqD. gaq The melting point and boiling point of
substance X are 321C and 765C 17. In its molten state, X conducts
electricity withoutrespectively.decomposition. X probably has A. an
ionic structure.B. a metallic structure.C. a simple molecular
structure.D. a covalent network structure. 2000-CE-CHEM 26 5 All
Rights Reserved 2000 7. 18.Some potassium carbonate solution is
added to a sample of tap water. Themixture then appears cloudy.
Which of the following ions is probablypresent in the sample ? NH4+
A.Mg2+ B.Br C.SO42 D. 19.Gold ornaments are usually made from an
alloy of gold and copper insteadof pure gold. This is because the
alloyA.can be found free in nature. B.is more corrosion resistant
than pure gold. C.is denser than pure gold. D.is stronger than pure
gold.A sample of concentrated sulphuric acid has a density of 1.83
g cm3 and 20.contains 94.0% of sulphuric acid by mass. What is the
concentration(correct to one decimal place) of sulphuric acid in
the sample ? (Relative atomic masses : H = 1.0, O = 16.0, S =
32.1)A. 17.5 M B. 18.3 M C. 18.7 M D. 19.8 M 21.Which of the
following processes requires a catalyst ?A. preparation of ethyl
ethanoate from ethanoic acid andethanol B. conversion of sulphur
trioxide to concentrated sulphuricacid C. manufacture of chlorine
bleach from brine D. reduction of iron(III) oxide to iron Go on to
the next page 2000-CE-CHEM 276 All Rights Reserved 2000 8. 22.A
white solid dissolves in water to give an alkaline solution. The
solutionreacts with dilute hydrochloric acid to give a gas. The
solid is probablyA. calcium oxide. B. calcium carbonate. C.
potassium hydroxide. D. potassium carbonate.In an experiment, 21.8
g of zinc was treated with 250.0 cm3 o f 2 M 23. .0hydrochloric
acid. What volume of hydrogen was liberated at roomtemperature and
pressure ? (Relative atomic mass : Zn = 65.4; 3 molar volume of gas
at room temperature and pressure = 24.0 dm ) 4.0 dm3 A.6.0 dm3
B.8.0 dm3 C. 12.0 d m3 D. 24.Which of the following compounds is
insoluble in water ?A. methanol B. methanoic acid C. methyl
methanoate D. sodium methanoate (This item was deleted.)25.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 thecontact process 2000-CE-CHEM 28 7 All Rights
Reserved 2000 9. 26.Which of the following combinations is correct
? Type of fireType of fire extinguisher to useA. electrical fire
water B. electrical fire foam C. kerosene fire water D. kerosene
fire foam 27.Which of the following changes occurs in a catalytic
converter installed in amotor car ?A. Nitrogen monoxide changes to
nitrogen dioxide. B. Carbon monoxide changes to carbon dioxide. C.
Unburnt hydrocarbons change to carbon particles. D. Sulphur changes
to sulphur dioxide. 28.Which of the following changes is NOT a
redox reaction ? Fe2(SO4)3 + H2S 2FeSO4 + S + H2SO4 A.2Al + 6HCl
2AlCl3 + 3H2 B.CaCO3 + CO2 + H2O Ca(HCO3)2 C.2KClO3 2KCl + 3O2 D.
29.Which of the following compounds would react with ammonium
chlorideon heating ?A. concentrated nitric acid B. concentrated
hydrochloric acid C. sodium hydroxide solution D. magnesium
sulphate solutionGo on to the next page 2000-CE-CHEM 298 All Rights
Reserved 2000 10. 30.In which of the following substances does
nitrogen has the smallestoxidation number ?A. NH3 B. NO C. N2O D.
N231.Which of the following uses of sulphuric acid is/are correct ?
(1)manufacture of soaps(2)manufacture of paint
additives(3)manufacture of fertilizersA. (1) only B. (2) only C.
(1) and (3) only D. (2) and (3) only32.Which of the following
articles should be made from thermosettingplastics ? (1)wall
paper(2)television casing(3)water bucketA. (1) only B. (2) only C.
(1) and (3) only D. (2) and (3) only33.In an experiment, a piece of
calcium metal was added to a beaker of water.Which of the following
statements concerning the experiment is/arecorrect ? (1)The calcium
metal sank to the bottom of the beaker.(2)The calcium metal burnt
with a brick red flame.(3)At the end of the experiment, an alkaline
solution was formed in the beaker.A. (1) only B. (2) only C. (1)
and (3) only D. (2) and (3) only2000-CE-CHEM 210 9 All Rights
Reserved 2000 11. 34.Which of the following statements concerning
helium is/are correct ? (1)The outermost electron shell of a helium
atom has an octet structure.(2)Helium is used to fill weather
balloons.(3)Helium exists as monatomic molecules.A. (1) only B. (2)
only C. (1) and (3) only D. (2) and (3) only 35.Consider the
chemical cell shown below : salt bridgemagnesiumcopper 1M
magnesium1M copper(II) sulphate solutionsulphate solution Beaker
XBeaker YWhich of the following statements concerning the cell
is/are correct ? (1)Oxidation takes place at the copper electrode.
The concentration of magnesium ions in beaker X increases.(2)(3)The
salt bridge allows electrons to flow from one electrode to the
other electrode.A. (1) only B. (2) only C. (1) and (3) only D. (2)
and (3) onlyGo on to the next page 2000-CE-CHEM 211 10 All Rights
Reserved 2000 12. 36.Which of the following polymers is/are made by
condensationpolymerization ?O OH H(1)C (CH2)4CN(CH2)6 Nn OC OCH3
(2)CH2 Cn CH3F F(3)C C n F FA. (1) onlyB. (2) onlyC. (1) and (3)
onlyD. (2) and (3) only37.Which of the following statements
concerning drugs is/are correct ? (1) Morphine is an effective
painkiller.(2) Acetaminophen (paracetamol) can damage the stomach
lining.(3) A suspension of milk of magnesia in water has a pH
greater than 7. A. (1) onlyB. (2) onlyC. (1) and (3) onlyD. (2) and
(3) only 2000-CE-CHEM 212 11 All Rights Reserved 2000 13. 38. sink
catchpotSome concentrated sulphuric acid was poured into a sink
connected to acatchpot made of polyvinyl chloride (PVC). After some
time, the catchpotbecame deformed.Which of the following
explanations for thedeformation of the catchpot is/are correct ?
(1) The heat liberated when the concentrated sulphuric acid mixed
withthe water in the catchpot caused PVC to soften.(2) PVC was
decomposed into its monomers by the concentratedsulphuric acid.(3)
PVC was oxidized by the concentrated sulphuric acid. A.(1)
onlyB.(2) onlyC.(1) and (3) onlyD.(2) and (3) only Go on to the
next page 2000-CE-CHEM 213 12 All Rights Reserved 2000 14. X can
form X2 ions. 39.X is an element in Group VI of the Periodic
Table.Which of the following statements are correct ? The oxidation
number of X decreases when X2 ion is formed.(1)Both X atom and X2
ion have the same number of electron shells.(2)Both X atom and X2
ion have the same nuclear charge.(3) A. (1) and (2) onlyB. (1) and
(3) onlyC. (2) and (3) onlyD. (1), (2) and (3) 40.Which of the
following measures can reduce the emission of pollutants froma
coal-fired power station ? (1) installation of scrubbers(2)
installation of electrostatic precipitators(3) increasing the
height of the chimney A. (1) and (2) onlyB. (1) and (3) onlyC. (2)
and (3) onlyD. (1), (2) and (3)41.Which of the following statements
concerning soaps are correct ? (1) They are esters.(2) They can
reduce the surface tension of water.(3) Their aqueous solutions are
alkaline. A. (1) and (2) onlyB. (1) and (3) onlyC. (2) and (3)
onlyD. (1), (2) and (3) 2000-CE-CHEM 214 13 All Rights Reserved
2000 15. 42.Which of the following statements concerning carbon,
silicon andphosphorus 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. A. (1) and (2) onlyB. (1) and (3) onlyC. (2) and (3) onlyD.
(1), (2) and (3)43.Which of the following statements concerning a
zinc-carbon cell are correct ? (1) The ammonium chloride in the
cell acts as an electrolyte.(2) The manganese(IV) oxide in the cell
acts as an oxidizing agent.(3) The zinc case of the cell acts as
the positive terminal. A. (1) and (2) onlyB. (1) and (3) onlyC. (2)
and (3) onlyD. (1), (2) and (3) 44.Which of the following
statements concerning sulphur dioxide are correct ? (1) It can be
prepared by heating copper turnings with concentratedsulphuric
acid.(2) It is denser than air.(3) It can be absorbed by sodium
hydroxide solution. A. (1) and (2) onlyB. (1) and (3) onlyC. (2)
and (3) onlyD. (1), (2) and (3) Go on to the next page 2000-CE-CHEM
215 14 All Rights Reserved 2000 16. Directions : Each question
below (Question Nos. 45 to 50) consists of twoseparate statements.
Decide whether each of the two statements istrue or false; if both
are true, then decide whether or not the secondstatement is a
correct explanation of the first statement. Then selectone option
from A to D according to the following table :A. Both statements
are true and the 2nd statement is a correct explanation of the1st
statement. B. Both statements are true but the 2nd statement is NOT
a correct explanation ofthe 1st statement. C. The 1st statement is
false but the 2nd statement is true. D. Both statements are
false.1st statement 2nd statement45. Concentrated sulphuric acid
canConcentrated sulphuric acid is a turn a piece of filter paper
black.strong oxidizing agent.46. Carbon dioxide and silicon dioxide
The atoms of carbon and silicon have similar physical
properties.have the same number of electronsin their outermost
shells.47. Chlorine is a better bleaching agent Chlorine bleaches
by reduction. for silk than sulphur dioxide.48. The volume of 10.0
g of gaseous10.0 g of gaseous carbon dioxide carbon dioxide is the
same as thecontains the same number of volume of 10.0 g of solid
carbon molecules as 10.0 g of solid carbon dioxide. dioxide.49.
Adding lime to acidic soil can Lime can neutralize the acid in the
increase crop yield. soil.50. Aluminium was used earlier
thanAluminium is more abundant than iron in the history of
mankind.iron in the earth crust.END OF PAPER 2000-CE-CHEM 216 15
All Rights Reserved 2000 17. 2000 Chemistry Paper 2Question No.Key
Question No. Key 1.B 26.D2.A 27.B3.B 28.C4.D 29.C5.A 30.A 6.D
31.D7.C 32.B8.A 33.C9.D 34.D10. A 35.B 11. C 36.A12. D 37.C13. C
38.A14. B 39.D15. C 40.A 16. B 41.C17. B 42.D18. B 43.A19. D
44.D20. A 45.B 21. A 46.C22. D 47.D23. B 48.C 18. 24. 49.A25. A
50.C All Rights Reserved 2000