SECTION 1 — 30 marks

 

1. Which of the following is not a form of electromagnetic radiation?

  • A Beta
  • B Gamma
  • C Infrared
  • D Ultraviolet

Ans A

2. The diagram represents the periodic table.


The shaded area is the

  • A s-block
  • B p-block
  • C d-block
  • D f-block.

Ans D

3. A representation of a d-orbital is shown.

The maximum number of electrons that can occupy this orbital is

  • A 2
  • B 4
  • C 8
  • D 10.

Ans A

4. For the reaction
                    BF3 + F−↓ BF4−
the three-dimensional arrangement of the bonds around the B atom changes from

  • A trigonal pyramidal to square planar
  • B trigonal pyramidal to tetrahedral
  • C trigonal planar to square planar
  • D trigonal planar to tetrahedral.

Ans D

5. Which of the following correctly shows the arrangement of the 3d electrons in the Ni2+
ion in[Ni(H2O)6]2+?

Ans B

6. Manganese has an oxidation number of +5 in

  • A MnO4
  • B MnO42
  • C MnO43 
  • D MnO2

Ans C

7. When sulfur dioxide and oxygen react the following equilibrium is established.
               2SO2(g) + O2(g) Ý 2SO3(g) ∆H = -197 kJ mol-1
Which line in the table is correct if the temperature of the equilibrium mixture is increased?

Ans A

8. H2CO3(aq) + CN(aq) Ý HCN(aq) + HCO3(aq)
Which line in the table correctly describes H2CO3(aq) and HCN(aq) in the above reaction?

Ans D

9. What is the concentration of hydroxide ions, in mol l-1
, in a solution with a pH of 8·5?

  • A 8·5 × 10-6
  • B 3·2 × 10-6
  • C 8·5 × 10-9
  • D 3·2 × 10-9

Ans B

10. Butanoic acid is a weak acid which dissociates as shown.
                 C3H7COOH(aq) + H2O(ℓ) Ý C3H7COO(aq) + H3O+(aq)
      The equilibrium position can be shifted to the right by the addition of

  • A a catalyst
  • B sulfuric acid
  • C sodium hydroxide
  • D sodium butanoate.

Ans C

11. Which of the following salts forms an alkaline solution in water?

  • A Sodium sulfate
  • B Lithium chloride
  • C Ammonium nitrate
  • D Potassium propanoate

Ans D

12. Which of the following combinations would produce a buffer solution?

  • A Sodium chloride and ammonia
  • B Ammonium chloride and ammonia
  • C Sodium chloride and sodium hydroxide
  • D Ammonium chloride and sodium hydroxide

Ans B

13. For which of the following reactions would the value of ∆G° – ∆H° be closest to zero?

  • A CaCO3(s) ↓ CaO(s) + CO2(g)
  • B C(s) + H2O(g) ↓ CO(g) + H2(g)
  • C Zn(s) + 2H+(aq) ↓ Zn2+(aq) + H2(g)
  • D Cu2+(aq) + Mg(s) ↓ Mg2+(aq) + Cu(s)

Ans D

14. The following reaction is first order with respect to P and second order with respect to Q.
                                         P + Q ↓ R + S
Which of the following statements is not correct?

  • A The reaction is third order overall.
  • B The reaction occurs by a simple one step mechanism.
  • C The rate of the reaction decreases as the reaction proceeds.
  • D The rate of the reaction will double if the initial concentration of P is doubled.

Ans B

15.

Which of the following types of hybridisation occur in the above compound?

  • A sp3only
  • B sp3and sp
  • C sp3and sp2
  • D sp3, sp2and sp

Ans B

16. Benzofuran is an important starting material in the manufacture of some medicines.

The gram formula mass of benzofuran is

  • A 124 g
  • B 120 g
  • C 118 g
  • D 114 g.

Ans C

17. The diagram represents one enantiomer of an optically active compound where W, X, Y andZ are four different groups.

Which of the following represents the other enantiomer of this compound?

Ans A

18. The most appropriate reactants for the synthesis of CH3CH2CH2CH2O Na+ are

  • A sodium and butan-1-ol
  • B sodium and butanoic acid
  • C sodium hydroxide and butan-1-ol
  • D sodium hydroxide and butanoic acid.

Ans A

19.

The above reaction is an example of

  • A hydration
  • B oxidation
  • C hydrolysis
  • D hydrogenation.

Ans C

20. 18 g of an oxide of copper contains 16 g of copper.
The empirical formula of this oxide is

  • A Cu4O
  • B Cu2O
  • C CuO2
  • D CuO4.

Ans B

21. A simplified mass spectrum of an organic compound is shown below.

Which of the following compounds could not have produced this spectrum?

  • A CH3OCOCH3
  • B CH3CH2COOH
  • C CH3CH2CH2CH2NH2
  • D CH3CH(OH)CH2CH3

Ans C

The infrared spectrum of eugenol would not be predicted to have an absorption in the
wavenumber range

  • A 3100 – 3000 cm-1
  • B 2962 – 2853 cm-1
  • C 1730 – 1717 cm-1
  • D 1150 – 1070 cm-1

Ans C 

23. Salbutamol is used to treat asthma. It behaves like the body’s natural active compound by
triggering a response in the muscles of the airways.
Salbutamol is

  • A an agonist
  • B an antagonist
  • C an inhibitor
  • D a receptor.

Ans A

24. 200 cm3 of water is added to 50 cm3 of 2 mol l-1 sodium hydroxide solution.
The concentration of the diluted sodium hydroxide solution in mol l-1
, is

  • A 0·5
  • B 0·4
  • C 0·2
  • D 0·1.

Ans B

25. For solvent extraction from an aqueous solution, the solvent used should be immiscible with
water and relatively unreactive.
Which of the following would be the most suitable solvent?

  • A CH3CH2CH2CH2CHO
  • B CH3CH2OCH2CH2CH3
  • C CH3CH2CH2CH2COOH
  • D CH3CH(OH)CH2CH2CH3

Ans B

26. Which of the following is not a step in a recrystallisation technique?

  • A Allow the filtrate to cool slowly.
  • B Filter the hot solution to remove insoluble impurities.
  • C Dissolve the crystals in a minimum of hot solvent.
  • D Test the filtrate to ensure no more precipitate forms.

Ans D

27. The melting point of an impure substance was determined to be 111 °C – 114 °C.
After purification, the melting point should be

  • A higher and over a wider range
  • B higher and over a narrower range
  • C lower and over a wider range
  • D lower and over a narrower range.

Ans B

28. During the technique of heating to constant mass, the purpose of the desiccator is to

  • A prevent reaction with oxygen in the air
  • B remove water from the compound
  • C prevent reabsorption of water
  • D prevent decomposition.

Ans C 

29. Using thin-layer chromatography, the components of a sample can be identified by Rf
values.Which of the following affects the Rf value for an individual component?

  • A The distance moved by the solvent.
  • B The concentration of the sample.
  • C The length of TLC plate.
  • D The solvent used.

Ans D

30. Which of the following diagrams shows the apparatus correctly set up for heating under
reflux?

Ans C

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