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    Section A

    Four suggested answers labelledA, B, C andD are given for each question. Choose one correct

    answer.

    1. Which of the following pairs are isotopic species?

    A. 26028

    6027

    KandJ C. 25826

    35726

    QandP

    B. MandL 7935

    7935

    D.

    ZandY8538

    8537

    2. Ethanol, C2H5OH and dimethyl ether, CH3OCH3 , are analysed separately in a mass

    spectrometer. Which of the following will be identical in both the mass spectrum?

    A. The number of peaks C. The position of the molecular peak

    B. The relative height of the peaks D. The number of fragment ions

    3. The diagram below represents the Boltzmann distribution of a sample of gas at

    25 C. If the temperature of the gas is increased to 50 C, in which direction wouldpoint X move?

    Fraction of molecules

    B C

    A X D

    Energy

    4. Sodium azide, NaN3, is made for use in car air bags. When this compound is

    heated to 300 C, it rapidly decomposes into its elements. Which volume of gas, at

    room temperature and pressure, would be produced by the decomposition of onemole of sodium azide? [1 mole of gas occupied 24.4 dm

    3at room temperature]

    A. 24.4 dm3

    B. 36.6 dm3

    C. 48.8 dm3

    D. 73.2 dm3

    5. Which of the following correctly represents a C+ ion at the ground state?

    A. C.

    B. D.

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    6. The triple point of a substance W is 4.2 atm and 278 K. If the temperature of solid W

    increases from 200 K to room temperature at a constant pressure of 3.0 atm, which

    of the following is not true?

    A. The solid gradually melts to form a liquid.B. The molecules occupy a bigger volume.

    C. The average kinetic energy of the molecules increases.

    D. The attractive forces between the molecules decrease.

    7. The ionic radii of sodium, magnesium and aluminium are 0.098 nm, 0.065 nm and

    0.045 nm, respectively. Which of the following statements best describes the

    descending trend?

    A. The total number of electrons and protons in the nucleus increases.

    B. The total number of electrons and protons in the nucleus decreases.C. The total number of electrons increases whereas the total number of protons in

    the nucleus is the same.

    D. The total number of electrons is the same whereas the total number of protons

    in the nucleus increases.

    8. Which of the following central atoms undergoes a different hybridisation from the

    rest?

    A. NH3 B. H2O C. AlCl3 D. C2H6

    9. The first, second, third and fourth ionisation energy of three elements P, Q and R are

    shown below.

    ElementIonisation energy / kJ mol

    1

    First Second Third Fourth

    P 494 4563 6913 9544

    Q 717 1500 3200 4712

    R 578 1817 2745 11578

    Which of the following is not true?

    A. P can form an ionic chloride.

    B. The oxide of R is amphoteric.

    C. P react vigorously with water .

    D. P and Q can combine to form a covalent compound with the formula PQ3.

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    10. The viscosity of glycerol is higher than that of ethanol.

    CH2OH

    CHOHCH2OH

    glycerol

    This is because

    A. the relative molecular mass of glycerol is higher.

    B. glycerol contains more polar bonds than ethanol.

    C. glycerol can form intermolecular hydrogen bonding but ethanol cannot.

    D. the covalent bonds in the glycerol molecule are stronger.

    11. 1.0 dm3

    of an aqueous solution containing 1.0 mol of trichloromethane and 1.0 mol

    of sodium hydroxide is left to react with one another. The ionic equation for the

    reaction is

    2CHCl3 + 7OH CO + HCOO+ 6Cl+ 4H2O

    The rate equation is

    Rate = k [CHCl3] [OH] = x

    Which of the following statements is correct with regards to the reaction?

    A. The reaction is second order with respect to trichloromethane.B. When trichloromethane is reacting at a rate of 0.2 mol dm

    3s1

    , the rate of

    formation of the chloride ion is 1.2 mol dm3

    s1.

    C. When the concentration of trichloromethane and the hydroxide ion are both

    doubled, the rate of reaction is 2x.

    D. When half of the hydroxide ion has reacted, the rate of reaction is x7

    3.

    12. Pressure

    Percentage of product

    Which of the following reactions will show the graph above?

    A. H2(g) + I2(g) 2HI(g) C. CaCO3(s) CaO(s) + CO2(g)

    B. 3H2(g) + N2(g) 2NH3(g) D. N2O4(g) 2NO2(g)

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    13. The graph below shows the yield of gasXat different temperatures and pressures.

    % of X in

    equilibrium

    mixture

    pressure / atm

    Based on the graph only, what conclusion can be drawn?

    A. There is a decrease in volume when the forward reaction proceeds.

    B. The forward reaction is endothermic.

    C. The reaction rate increases in the presence of a catalyst.

    D. Pressure has no effect on the position of equilibrium.

    14. The table below lists the pH range and the colour change for three different

    indicators.

    Indicator pH range Colour change

    Methyl orange 2.94.0 red yellowBromothymol blue 6.07.6 yellow bluePhenolphthalein 8.210.0 colourless red

    What will be the colours of the indicators if they are added separately to a solution of

    pH 7.0?

    Methyl orange Bromothymol blue Phenolphthalein

    A. Yellow Blue Colourless

    B. Yellow Green Colourless

    C. Red Yellow Colourless

    D. Orange Yellow Colourless

    15. Public swimming pools are often chlorinated to kill bacteria. As an alternative to

    chlorination, silver ions in a concentration between 107

    and 106

    mol dm3

    can be

    used. Which of the following saturated solutions would provide the necessary

    concentration of the needed silver ions?

    Compound KspA. Ag2CO3 5.0 x 10

    12mol

    3dm

    9

    B. AgIO3 2.0 x 108

    mol2

    dm6

    C. AgCl 2.0 x 10

    10

    mol

    2

    dm

    6

    D. AgBr 5.0 x 1013

    mol2

    dm6

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    16. The boiling pointcomposition diagram of two liquids, W and Z, is shown below.

    Boiling

    point

    W X Y Z

    100 % Composition 100 %

    What is the composition of the liquids being collected if a mixture of composition Y

    is fractionally distilled?

    A. W and X C. W and ZB. W and Y D. X and Z

    17. The E

    values for some halfcells are given below.

    Halfcell reaction E

    / V

    Sn4+

    + 2e

    Sn2+ + 0.15[Fe(CN)6]

    3+ e [Fe(CN)6]4 + 0.36

    I2 + 2e 2I + 0.54

    Fe3+

    + e

    Fe2+

    + 0.77

    Which of the following reactions is spontaneous?

    A. Sn4+

    + 2 I Sn2+ + I2B. I2 + 2 Fe

    2+ 2 I + 2 Fe3+

    C. Sn4+

    + 2 [Fe(CN)6]4 Sn2+ + 2 [Fe(CN)6]

    3

    D. I2 + 2 [Fe(CN)6]4 2 I+ 2 [Fe(CN)6]

    3

    18. Which of the following statements is true regarding electrolysis?

    A. Oxidation occurs at the cathode and reduction occurs at the anode.

    B. Electrons flow from the cathode to the anode through the external circuit.

    C. The amount of substances produced during electrolysis is directly proportional

    to the amount of electric current and the charge on the ions.

    D. The ease of discharge of metallic cations is inversely proportional to the

    reactivity of the metals.

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    19. Standard combustion enthalpies for 1,2ethanediol (HOCH2CH2OH), carbon and

    hydrogen are1180.0 kJ mol1,393.7 kJ mol

    1and285.9 kJ mol

    1respectively.

    What is the standard formation enthalpy, for 1,2ethanediol?

    A. 500.4 B. 465.1 C. +465.1 D. +500.4

    20. A student obtained the observations regarding three oxides, K, L and M.

    (i) K is insoluble in water but is soluble in sodium hydroxide aqueous and dilute

    hydrochloric acid.

    (ii) L dissolves partially in water but is soluble in dilute hydrochloric acid.

    (iii) M dissolves in water to form a pH 3 solution.

    The acidity of the three oxides in the decreasing order is

    A. K, L, M B. K, M, L C. M, K, L D. M, L, K

    21. Magnesium carbonate and barium carbonate decompose when heated to form

    magnesium oxide and barium oxide respectively. However, magnesium carbonate

    thermally decomposes at a lower temperature. All of the following can be used to

    explain the phenomenon except

    A. magnesium oxide is more thermally stable than barium oxide.

    B. the carbonate anion is easily polarised by the magnesium cation.

    C. barium carbonate has more ionic character than magnesium carbonate.D. magnesium carbonate has higher lattice energy than barium carbonate.

    22. Which of the following statements explains why tetrachloride silicon, SiCl4 , forms

    white fumes in the moist air whereas tetrachloride carbon, CCl4 , does not undergo

    hydrolysis?

    A. Tetrachloride carbon is inert.

    B. Tetrachloride carbon needs warm water to be hydrolysed.

    C. The bonding of SiCl is weaker than that of CCl.D. SiCl4 molecule has empty valence orbitals to receive the water molecules.

    23. The reaction between chlorine and aqueous sodium hydroxide is given as below.

    3Cl2(g) + 6NaOH(aq) NaClO3(aq) + 5NaCl(aq) + 3H2O(l).

    Which of the following statements is not true regarding the above reaction?

    A. Dilute NaCl solution is used in the reaction.

    B. Reaction occurs at hot condition.

    C. Chlorine molecules undergo disproportionation reaction.

    D. NaClO3 produced is used as explosive substance.

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    24. The following graph shows the standard electrode potential, E, of

    M3+

    (aq) / M2+

    (aq) for the transition elements (titanium to cobalt) in the Periodic

    Table.

    -1

    0

    1

    2

    Ti V Cr Mn Fe Co

    Based on the graph above, which of the following ions are more stable relatively in

    their +2 and +3 oxidation states?

    A. Ti2+

    , V2+

    , Cr2+

    , Mn3+

    , Fe3+

    , Co3+

    C. Ti3+

    , V2+

    , Cr3+

    , Mn2+

    , Fe3+

    , Co2+

    B. Ti

    2+

    , V

    2+

    , Cr

    2+

    , Fe

    2+

    , Mn

    3+

    , Co

    3+

    D. Ti

    3+

    , V

    3+

    , Cr

    3+

    , Mn

    2+

    , Fe

    2+

    , Co

    2+

    25. An organic compound W has the following properties:

    (i) All the carbon atoms are on the same plane.

    (ii) All the carbon atoms have the same type of hybridisation.

    (iii) Does not react with chlorine at room temperature.

    Which of the following compounds is W?

    A. CH2 = CH2 C. CH3CH2CH(CH3)2

    B. D.

    Electrode potential, E

    M3+

    (aq) / M2+

    (aq) / V

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    26. The equations below show the products formed in two separate experiments.

    I:

    CH3

    + HNO3

    42SOH

    CH3

    NO2

    +

    CH3

    NO2

    II:

    NO2

    + CH3Cl3AlCl

    NO2

    CH3

    Why are different isomers of methylnitrobenzene obtained?

    A. The type of catalyst used in both reactions is different.

    B. The methyl group is an orthopara director whereas the nitro group is a meta

    director.

    C. Nitration is an exothermic process whereas alkylation is an endothermic

    process.

    D. Compared to nitro group, methyl group strongly activates the benzene ring,

    thus encouraging multiple products.

    27. A series of reactions of benzene is shown as below.

    I

    CH3II

    Br CH3III

    Br COOH

    IV

    Br COOH

    O2N

    Which of the following steps involve electrophilic substitution?

    A. I and III C. I, II and IV

    B. I, II and III D. II and IV

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    28. Which of the following compounds is the product obtained when ethene is oxidised

    by oxygen at 300 C using silver catalyst?

    A. HOCH2CH2OH C. H2CCH2

    O

    B. HCCH O O

    D. O

    CH2 CH2

    \ /

    O O

    29. What are the reactions required to carry out the following synthesis?

    CH2CH2OH CHBrCH3

    A. Oxidation, addition C. Dehydration, reduction

    B. Reduction, oxidation D. Dehydration, addition

    30. When ethylmagnesium bromide, CH3CH2MgBr, is heated with an organic compound

    X, 2methyl2butanol is formed. What is compound X?

    A. Propanal C. 2methylpropane

    B. Propanone D. 2methyl2butene

    31. P, Q, R are three different compounds. P and Q react readily at room temperature to

    form an ester. In the presence of concentrated sulphuric acid and under reflux, P

    reacts with R to form the same ester. P could be

    A. ethanoic acid C. ethanenitrile

    B. ethanol D. ethanoyl chloride

    32. A compound X has the following chemical properties.

    (i) Forms a silver deposit when tested with Tollens reagent (ii) Liberates hydrogen gas when tested with sodium

    (iii) Does not react with phosphorus pentachloride

    Which of the following compounds is X?

    A. HOCH2CCH3O

    C. CH2CHO

    COOH

    B.

    HO

    CHO D. HCOOH

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    33. Consider the following mechanism between ethanal and the cyanide ion :

    : C N : +

    O

    CH3CH

    O

    CH3CHCN

    H

    OH

    CH3CHCN

    Which of the following statements is true for the reaction?

    A. The carbonyl carbon atom has a low electron density.

    B. The CN

    is an electrophile.

    C. The nitrogen atom in the CN ion donates a lone pair of electrons for bond

    formation.

    D. The reaction temperature must be higher than room temperature.

    34. Excess sodium hydroxide aqueous is

    added to compound X. Which of the

    following is the product formed?

    HOOC

    CH2OH

    HO X

    A.

    OOC

    CH2OH

    O

    C.

    OOC

    CH2O

    HO

    B.

    HOOC

    CH2OH

    O

    D.

    OOC

    CH2O

    O

    35. Each of the following compounds is poured into a test tube and an aqueous solutionof silver nitrate is added. The three test tubes are then placed in a hot water bath.

    CH3CH2COCl Cl ClCH2COOH

    I II III

    Which sequence of the compounds according to the descending order of their

    reactivity is correct?

    A. II, III, I C. I, III, II

    B. III, I, II D. I, II, III

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    36. Chaulmoogric acid shown below is a cyclic fatty acid found in the chaulmoogra oil.

    The oil can be extracted from an East Indian plant and was used to treat leprosy.

    (CH2)12COOH

    Which of the following statements is not true for chaulmoogric acid?

    A. Hydrogenation of chaulmoogric acid is important for the manufacture of butter.

    B. 0.01 mol of the acid reacts completely with 200 cm3

    of 0.05 mol dm3

    NaOH.

    C. It decolourises bromine water.

    D. It forms an ester with ethanol.

    37. Which of the following reagents can be used to distinguish between ethylamine and

    ethanamide?

    A. 2,4dinitrophenylhydrazine C. aqueous sodium hydroxide

    B. phosphorus(V) oxide D. alkaline iodine

    38. Which of the following pairs of compounds and reagents will react to form

    benzenediazonium chloride under suitable conditions?

    A. Phenol and H2SO4 / HCl C. Phenylamine and HNO3 / HCl

    B. Nitrobenzene and Sn / HCl D. Phenylamine and NaNO2 / HCl

    39. Although the relative molecular mass of amino ethanoic acid (Mr = 75) and

    1butanol (Mr = 74) are almost the same, amino ethanoic acid is a solid at room

    temperature and pressure whereas 1butanol is a liquid. This is because

    A. amino ethanoic acid can form zwitterions.

    B. all the atoms in the amino ethanoic acid molecule lie on the same plane.

    C. only amino ethanoic acid can form strong intermolecular hydrogen bonds.

    D. the surface area of the 1butanol molecules is larger than amino ethanoic acid.

    40. Bakelite is an example of

    A. an elastomer C. a homopolymer

    B. a thermoplastic D. a thermosetting polymer

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    A B C D

    1 only

    is correct

    1 and 2 only

    are correct

    2 and 3 only

    are correct

    1, 2 and 3

    are correct

    41. Which of the following statements is/are correct?

    1 Chromium and manganese have the same number of electrons in the 3d

    subshell

    2 Copper and zinc have the same number of electrons in the 3d subshell

    3 Chromium and copper have the most unpaired electrons in their respective

    atoms

    42. Which of the following observations can be explained from the viewpoint of

    intermolecular forces only?1 CO2 is a gas whereas SiO2 is solid.

    2 SiCl4 is more volatile than GeCl4.

    3 Although the size of the sulphur atom is smaller than the size of the phosphorus

    atom, the boiling point of sulphur is higher than the boiling point of

    phosphorus.

    43. The change in ionic product for water, Kw with temperature is as shown below.

    Temperature, K 15.0 40.0 62.0 75.0

    Kw / x 1014 mol2 dm6 0.450 2.92 10.0 16.9

    Which of the following statements is/are correct?

    1 The dissociation of water is an endothermic process.

    2 Water is a stronger electrolyte at a higher temperature.

    3 The concentration of H+

    increases with increase in temperature.

    44. Several experiments were carried out on a solute Q to determine its distribution

    between two immiscible solvents, water and chloroform. The ratio of the

    concentration of Q in water and chloroform after equilibrium is shown below.

    Experiment number 1 2 3

    chloroform

    water

    ]Q[

    ]Q[ 8.20 10.77 9.30

    Which of the following could account for the above results?

    1 The temperature of the solvents was not kept constant.

    2 The solute Q is in different molecular condition in both solvents.

    3 The solution mixture does not obey Raoults Law.

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    A B C D

    1 only

    is correct

    1 and 2 only

    are correct

    2 and 3 only

    are correct

    1, 2 and 3

    are correct

    45. Which of the following reasons for recycling aluminium is not true?

    1 For producing better quality aluminium.

    2 Reduce environmental pollution.

    3 Producing aluminium at a lower cost.

    46. In which of the following reactions does ammonia act as a lone pair electrons donor?

    1 HCl(g) + NH3(g) NH4Cl(s)2 Cu2+(aq) + 4NH3 (aq) Cu(NH3)42+

    (aq)

    3 HSO4

    (aq) + NH3(aq) NH4+(aq) + SO4

    2(aq)

    47. An organic compound containing 59.7 % chlorine (by mass) is formed when a

    hydrocarbon X reacts completely with chlorine without evolving white fumes. What

    could the structural formulae for X be?

    [relative atomic mass : H = 1, C = 12, Cl = 35.5; relative molecular mass of X = 96.]

    1 CH3CH = CHCH = CHCH2CH3

    2

    CH3CH3

    3

    CH3

    48. Which of the following compounds is/are the major product(s) when

    pmethylphenol reacts with aqueous bromine?

    1 OH

    Br Br

    CH3

    2 OH

    BrCH3

    3 OH

    Br BrCH3

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    A B C D

    1 only

    is correct

    1 and 2 only

    are correct

    2 and 3 only

    are correct

    1, 2 and 3

    are correct

    49. Which of the following pairs of compounds can be differentiated by using an

    aqueous solution of iron(III) chloride?

    1 Phenol and benzoic acid.

    2 Ethanoic acid and ethanol.

    3 Phenol and methanol.

    50. Styrene, C6H5CH = CH2 can be polymerised to poly(styrene). It can be concluded

    that

    1 The empirical formula of styrene and poly(styrene) are the same.

    2 The HCH bond angle in styrene and poly(styrene) are the same.3 Both styrene and poly(styrene) will decolourise aqueous bromine.