SECTION 1 — 30 marks

1. All noble gases are characterised by the completion of the outermost orbital.
This orbital is

  • A an s-orbital
  • B a p-orbital
  • C a d-orbital
  • D an s or p-orbital.

Ans D

2. The electronic configuration of an atom of X, in its ground state, is 1s2 2s2 2p6 3s2 3p6 3d1 4s2
X is an atom of

  • A calcium
  • B scandium
  • C titanium
  • D vanadium.

Ans B

3. Which line in the table could represent the four quantum numbers of an outer electron in
an Mg2+ion?

Ans C

4. The coordination number of an ionic lattice can be determined by using the following
equation.

What is the coordination number in zinc(II) sulfide?

  • A 3
  • B 4
  • C 6
  • D 8

Ans B

5. What is the formula for the diaquatetrachlorocobaltate(II) ion?

  • A [CoCl4(H2O)2]2−
  • B [CoCl2(H2O)4]2−
  • C [CoCl4(H2O)2]2+
  • D [CoCl2(H2O)4]2+

Ans A

6. Which of the following indicators is most suitable to use in a titration of dilute hydrochloric
acid solution with dilute ammonia solution?

  • A Bromothymol blue
  • B Phenolphthalein
  • C Methyl orange
  • D Phenol red

Ans C

7. The pH of a solution of benzoic acid with concentration 0·01 mol l−1 is

  • A 1·1
  • B 2·0
  • C 3·1
  • D 5·2.

Ans C

8. A reaction must be exothermic if

  • A both ∆G ° and ∆S ° are negative
  • B both ∆G ° and ∆S ° are positive
  • C ∆G ° is negative
  • D ∆S ° is positive.

Ans A

9. For the reaction
                     A + B ↓ C
the following data were obtained.Experiment Initial concentration


Given that the rate equation is
Rate = k[B]2
the value of X will be

  • A 0·05
  • B 0·10
  • C 0·15
  • D 0·20.

Ans D

10. The rate equation for the reaction between nitrogen monoxide and chlorine is
                      rate = k[NO]2[Cl2]
The units for the rate constant, k, in this reaction are

  • A s−1
  • B mol l−1 s−1
  • C l mol−1 s−1
  • D l2 mol−2 s−1

Ans D

11. Which of the following describes the bonding in ethane?

  • A sp2 hybridisation with sigma bonds only.
  • B sp3 hybridisation with sigma bonds only.
  • C sp2 hybridisation with sigma and pi bonds.
  • D sp3 hybridisation with sigma and pi bonds.

Ans B

12. Pyridine has the following structure.


The number of sigma bonds in a molecule of pyridine is

  • A 3
  • B 6
  • C 11
  • D 12.

Ans C

13. A racemic mixture is defined as

  • A a mixture of two enantiomers
  • B a pair of enantiomers mixed in equal proportions
  • C a mixture of two geometric isomers
  • D a pair of geometric isomers mixed in equal proportions.

Ans B

14. CH3CH2Br + NH3 ↓ CH3CH2NH2 + HBr
            CH3Br + OH− ↓ CH3OH + Br−
The nucleophiles in these two reactions are

  • A CH3Br and NH3
  • B OH−and CH3CH2Br
  • C CH3CH2Br and CH3Br
  • D NH3 and OH−

Ans D

15. A compound X has a GFM of less than 100 g.
Complete combustion of compound X produces carbon dioxide and water only.
Reduction of compound X produces a secondary alcohol.
Compound X is most likely to be

Ans C

16.


Based on the information in the table,

  • A the tertiary amine has the highest boiling point
  • B the secondary amine has the lowest boiling point
  • C the primary amine has a lower boiling point than the tertiary amine
  • D the secondary amine has a lower boiling point than the primary amine.

Ans D

17. Compound Y reacts with the product of its own oxidation to form an ester.
Compound Y could be

  • A propanal
  • B propan-1-ol
  • C propan-2-ol
  • D propanoic acid.

Ans B

18. Which of the following statements about benzene is correct?

  • A The benzene molecule is planar.
  • B Benzene does not react with electrophiles.
  • C Benzene readily undergoes nucleophilic attack.
  • D The benzene molecule contains carbon to carbon bonds of two different lengths.

Ans A

19. Chlorine has two isotopes, 35Cl and 37Cl.
These isotopes are present in a sample of 1,1,1-trichloroethane, C2H3Cl3. The number of
molecular ion peaks expected in the mass spectrum of 1,1,1-trichloroethane is

  • A 6
  • B 4
  • C 3
  • D 2.

Ans B

20. The following substance was analysed using an infrared spectrometer.

The spectrum produced would not have a significant peak in the wave number range

  • A 1700–1680 cm−1
  • B 2962–2853 cm−1
  • C 3100–3000 cm−1
  • D 3500–3300 cm−1

Ans C

21. Antisense drugs are a group of medicines that act by binding to DNA to block the synthesis
of some proteins.
Which line in the table is correct for antisense drugs?

  •                                 Classification                        Receptor
    A                               antagonist                                      DNA
  • B                                   antagonist                                     protein
  • C                                     agonist                                              DNA
  • D                                     agonist                                             protein

Ans A

 22. Which of the following would be most suitable as a reagent in the gravimetric analysis of
silver ions?

  • A Sodium nitrate
  • B Potassium sulfate
  • C Barium carbonate
  • D Ammonium chloride

Ans D

23. Using colorimetry, the most appropriate filter for determining the concentration of green
nickel ions, Ni2+(aq), in a solution, would be

  • A 390 nm
  • B 490 nm
  • C 540 nm
  • D 680 nm.

Ans A

24. The diagram shows a thin layer chromatogram for a mixture of amino acids. Distance moved by solvent and amino acids (cm)

Which amino acid has an Rf value of approximately 0∙75?

  •  A Amino acid S
  • B Amino acid R
  • C Amino acid Q
  • D Amino acid P

Ans C

25. Which line in the table shows the properties of the most suitable solvent to extract caffeine
from an aqueous solution of tea?


Ans A

26. A series of titrations was performed to determine the concentration of vitamin C in a brand
of fruit juice. A standard solution of the fruit juice was prepared and titrated with iodine solution.
Which of the following would be a suitable control experiment for this analysis?

  • A Titrate more samples from the same carton of fruit juice.
  • B Titrate a solution of pure vitamin C of known concentration.
  • C Titrate more samples from the standard solution of fruit juice.
  • D Titrate a sample from a different carton of the same brand of fruit juice.

Ans B

27. Ba(OH)2(aq) + Na2SO4(aq) ↓ BaSO4(s) + 2NaOH(aq)
50 cm3of 0·010 mol l−1 barium hydroxide solution were added to 50 cm3of 0·010 mol l−1 sodium sulfate solution.
The concentration of sodium hydroxide, in mol l−1, in the resulting solution is

  • A 0·0010
  • B 0·010
  • C 0·020
  • D 0·10.

Ans B

28. 1·06 × 10−2moles of phenylamine, C6H5NH2, react with 5·16 g of bromine.
Which equation shows the correct stoichiometry for this reaction?

  • A C6H5NH2 + Br2 ↓ C6H4BrNH2 + HBr
  • B C6H5NH2 + 2Br2 ↓ C6H3Br2NH2 + 2HBr
  • C C6H5NH2 + 3Br2 ↓ C6H2Br3NH2 + 3HBr
  • D C6H5NH2 + 4Br2 ↓ C6HBr4NH2 + 4HBr

Ans C

29. Ibuprofen is used for the relief of pain, fever and inflammation. A structural formula for
ibuprofen is shown below.

If one tablet contains 300 mg of ibuprofen, approximately how many tablets can be
manufactured from 1 mole of ibuprofen?

  • A 6·73 × 102
  • B 6·87 × 102
  • C 6·73 × 10−1
  • D 6·87 × 10−1

Ans B

30. The term accuracy is used to describe how close an experimental result is to the theoretical
value. The term precision is used to describe how close a set of duplicate results are to each
other.
Four students determined the percentage by mass of chlorine in BaCl2.2H2O.
Which of the following sets of results is both accurate and precise?

  • A 29·0%, 29·0%, 29·1%
  • B 29·1%, 28·2%, 29·9%
  • C 34·0%, 34·1%, 34·0%
  • D 34·0%, 34·3%, 33·8%

Ans A

 

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