ST.

CATHARINE'S SCHOOL FOR GIRLS, KWUN TONG

F.6 MOCK EXAMINATION (2012-2013)

CHEMISTRY
PAPER I

This paper must be answered in English.

Date: -1-2013 Name :

Time allowed: 2 hours 30 minutes. Class : ( )

GENERAL INSTRUCTIONS

1. There are TWO sections, A and B, in this Paper. Section A carries 36 marks and Section B
carries 84 marks. You are advised to finish Section A in about 45 minutes and Section B in about
105 minutes.

2. Section A consists of multiple-choice questions in this question book, while Section B contains
conventional questions printed separately in Question-Answer Book B.

3. Answers to Section A should be marked on the Multiple-choice Answer Sheet while answers to
Section B should be written in the spaces provided in Question-Answer Book B. The Answer
Sheet for Section A and the Question-Answer Book for Section B must be handed in
separately at the end of the examination.

SECTION A (MULTIPLE-CHOICE QUESTIONS)

INSTRUCTIONS FOR SECTION A

1. Read the instructions on the Answer Sheet carefully. After the announcement of the start of the
examination, you should stick a barcode label and insert the information required in the spaces
provided. No extra time will be given for sticking the barcode label after the ‘Time is up’
announcement.
2. When told to open this book, you should check that all the questions are there. Look for the words
‘END OF SECTION A’ after the last question.
3. All questions carry equal marks.
4. ANSWER ALL QUESTIONS. You should use an HB pencil to mark all your answers on the
Answer Sheet, so that wrong marks can be completely erased with a clean rubber.
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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This section consists of two parts. There are 24 questions in PART I and 12 questions in PART II.

Choose the best answer for each question.

Candidates may refer to the Periodic Table printed on the back of this Question Paper.

PART I

1. Which of the following hazard warning labels should be displayed on a bottle of aqueous chlorine?

2. The following diagram shows an experimental set-up for collecting a gas produced in a certain
reaction.

Which of the following actions can prevent‘sucking back’ of water?

(1) Take the delivery tube away from water before removing the flame.
(2) Remove the flame before taking the delivery tube away from water.
(3) Decrease the amount of water in the trough.
A (1) only
B (2) only
C (1) and (3) only
D (2) and (3) only

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3. Which of the following set-ups can be used to dry a moist gas?

A (1) and (2) only

B (1) and (3) only
C (2) and (3) only
D (1), (2) and (3)

4. Consider the following atoms:

Atom Atomic number Mass number Number of electrons
W 20 46
X 22 46
Y 48 22
Z 94 42
Which of the following pairs are isotopes?
A W and X
B W and Z
C X and Y
D Y and Z

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5. The relative atomic mass of a sample of copper is 63.6. Which of the following graphs shows the
relative abundance of the isotopes?

6. In cinnabar, mercury exists mainly as a

A carbonate.
B chloride.
C sulphate.
D sulphide.
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7. In which of the following cases will a reaction take place?
(1) Mixing aluminium with cold water
(2) Mixing iron with dilute hydrochloric acid
(3) Mixing copper(II) oxide with carbon
A (1) only
B (2) only
C (1) and (3) only
D (2) and (3) only

8. Consider the results of displacement reactions involving four different metals, W, X, Y and Z.
Metal

Solution W X Y Z
containing

W2+(aq) — P P ×
+
X (aq) × — P ×
2+
Y (aq) × × — ×
+
Z (aq) P P P —
key: P = reaction
× = no reaction
Which of the following metals loses electrons most easily?
A W
B X
C Y
D Z

9. Element X forms two oxides X2O and XO. If 1 mole of X2O contains n atoms, 3 moles of XO would
contain

10. Which of the following combinations is INCORRECT?

Iron article Method for protecting iron from
rusting
A Car body impressed current cathodic protection
B Coat hanger plastic coating
C Food can galvanized iron
D Surgical instrument stainless steel
11. When solution X is diluted, its electrical conductivity decreases but its pH remains constant.
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 X could be
(1) ethanoic acid.
(2) sodium chloride solution.
(3) sodium hydroxide solution.
A (1) only
B (2) only
C (1) and (3) only
D (2) and (3) only

12. Which of the following reaction sequences is the most suitable for preparing lead(II) sulphate from
lead(II) carbonate?

13. In an experiment, an acid is added to an alkali in a beaker. The graph below shows the variation of
pH when the acid is added.

The pH range for colour change of three acid-alkali indicators are listed below:
Indicator pH range
(1) Methyl red 4.8 to 6.0
(2) Thymol blue 8.0 to 9.6
(3) Phenolphthalein 8.2 to 10.0
Which of the following indicators is / are suitable for the acid-alkali titration?
A (1) only
B (2) only
C (1) and (3) only
D (2) and (3) only
14. The progress of the reaction between permanganate ions and oxalate ions was followed by using a
colorimeter.
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 Consider the following information of two reaction mixtures:
Reaction mixture 1 2
0.10 mol dm–3 sodium 1.0 1.0
oxalate solution (cm3)
2.0 mol dm–3 sulphuric 1.0 1.0
acid (cm3)
Distilled water (cm3) 1.0 1.5
0.0010 mol dm–3 1.0 0.5
potassium permanganate
solution (cm3)

Which of the following graphs shows the results obtained?

15. Which of the following substances can be used to distinguish between concentrated nitric acid and
concentrated sulphuric acid?
(1) Sodium carbonate powder
(2) Copper turnings
(3) Sulphur powder
A (1) and (2) only
B (1) and (3) only
C (2) and (3) only
D (1), (2) and (3)

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16. The following diagram shows the set-up of a chemical cell.

Given that Br2(aq) is a stronger oxidizing agent than Cu2+(aq) ion, which of the changes represented
by the following half-equations would occur if the cell is producing a current?
(1) Cu+(aq) à Cu2+(aq) + e–
(2) Cu2+(aq) + e– à Cu+(aq)
(3) 2Br–(aq) à Br2(aq) + 2e–
A (1) only
B (2) only
C (1) and (3) only
D (2) and (3) only
17. In which of the following processes will the solution in the electrolytic cell become more acidic?
(1) Electrolysis of dilute sulphuric acid using platinum electrodes
(2) Electrolysis of concentrated hydrochloric acid using carbon electrodes
(3) Electrolysis of dilute copper(II) sulphate solution using carbon electrodes
A (1) only
B (2) only
C (1) and (3) only
D (2) and (3) only
18. Which of the following statements concerning the reaction between acidified dilute potassium
permanganate solution and ethene is / are correct?
(1) The oxidation number of manganese changes from +7 to +2.
(2) The structure of the carbon compound formed is

.
(3) A similar reaction will occur if acidified dilute potassium dichromate solution is used
instead of acidified dilute potassium permanganate solution.
A (1) only
B (2) only
C (1) and (3) only
D (2) and (3) only
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19. Which of the following substances is the most volatile?
A Butan-1-ol
B Propan-1-ol
C Butane
D Pentane

20. The structure of a polymer is shown below:

Which of the following statements about the polymer is INCORRECT?

A Its monomer is CH2=CHCH2CH3.
B Its monomer can turn acidified dilute potassium dichromate solution from orange to green.
C It is an addition polymer.
D It softens upon heating.

21. Given that

C2H5OH(g) + 3O2(g) à 2CO2(g) + 3H2O(l) ΔHO = –1 368 kJ mol–1
then the ΔH value for
4CO2(g) + 6H2O(l) à 2C2H5OH(g) + 6O2(g)
would be
A +2 736 kJ.
B +1 368 kJ.
C +684 kJ.
D –1 368 kJ.

22. The table below lists the standard enthalpy changes of combustion of three substances.
Substance (kJ mol–1)
C(graphite) –394
H2(g) –286
C3H6(g)
–2 090
cyclopropane
What is the standard enthalpy change of formation of cyclopropane?
A –1 410 kJ mol–1
B –50 kJ mol–1
C +50 kJ mol–1
D +1 410 kJ mol–1

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Assertion-reason questions

Directions: 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 while the 2nd statement is true.
D Both statements are false.

1st statement 2nd statement

23. Sublimation of iodine has a negative Sublimation of iodine is an

ΔH value. exothermic process.

24. The standard enthalpy changes of O2(g) and O3(g) are allotropes of
formation of O2(g) and O3(g) are both oxygen.
zero.

END OF PART I

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PART II
25. Which arrangement of electron pairs will be found in an ICl4– ion?

26. Compounds X and Y have the following structures:

Which of the following statements is / are correct?

(1) Both are polar compounds.
(2) The boiling point of X is higher than that of Y.
(3) Permanent dipole-permanent dipole attractions exist in both compounds.
A (1) only
B (2) only
C (1) and (3) only
D (2) and (3) only
27. Menthol shown below is used in skin lotions as it counteracts itching.

Which of the following statements concerning menthol is correct?

A It contains two chiral carbons and a carboxyl group.
B It contains two chiral carbons and a hydroxyl group.
C It contains three chiral carbons and a carboxyl group.
D It contains three chiral carbons and a hydroxyl group.
28. Consider the following reaction sequence.
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 Which of the following combinations is correct?
X Y Z
A (CH3)3CCH2CH3 (CH3)3CCHBrCH3 (CH3)3CCH(OH)CH3
B (CH3)3CCH2CH3 (CH3)3CCH2CH2Br (CH3)3CCH2CH2OH
C (CH3)3CCH=CH2 (CH3)3CCHBrCH3 (CH3)3CCH(OH)CH3
D (CH3)3CCH=CH2 (CH3)3CCH2CH2Br (CH3)3CCH2CH2OH
29. Iodide ions are oxidized to iodine by peroxodisulphate ions (S2O82–(aq)). The reaction can be
catalyzed by Fe2+(aq) ions.
In an experiment to investigate the uncatalyzed reaction, the concentration of iodine was determined
at different times. Curve X was obtained.
The experiment was repeated in the presence of Fe2+(aq) ions, while keeping other conditions the
same. Curve Y was obtained.
Which of the following shows the curves obtained?

30. Methanol can be produced by a reaction between carbon monoxide gas and hydrogen gas.
What is the volume of hydrogen, measured at room temperature and pressure, required to produce
20.8 g of methanol?
(Relative atomic masses: H = 1.0, C = 12.0, O = 16.0; molar volume of gas at room temperature and
pressure = 24.0 dm3 mol–1)
A 15.6 dm3
B 31.2 dm3
C 36.9 dm3
D 73.8 dm3
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31. Consider the equilibrium expression Kc1 for reaction 1:

and the equilibrium expression Kc2 for reaction 2:

How is Kc2 related to Kc1?

32. Consider the following equilibrium system:

Addition of which of the following substances will cause the position of equilibrium to shift to the
right?
A Hydrogen
B Hydrogen chloride
C Potassium chloride
D Sodium hydroxide

33. There is a gradual change in the properties of the three halogens, chlorine, bromine and iodine.
Which of the following properties is / are in the order of chlorine > bromine > iodine?
(1) Atomic radius
(2) Electronegativity
(3) Oxidizing power
A (1) only
B (2) only
C (1) and (3) only
D (2) and (3) only

34. Which of the following combinations is correct?

Maximum oxidation state
Transition metal the metal exhibits
A Ti +2
B V +3
C Cr +6
D Fe +4

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Assertion-reason questions

Directions: 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 while the 2nd statement is true.
D Both statements are false.

1st statement 2nd statement

35. The density of cis-butenedioic acid is Cis-butenedioic acid has a net

higher than that of trans-butenedioic dipole moment while trans-
acid. butenedioic acid has not.

36. Propan-2-ol and propanone can be Propan-2-ol gives steamy fumes

distinguished by mixing with with phosphorus pentachloride
phosphorus pentachloride. while propanone does not.

END OF PART II

END OF SECTION A

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