SECTION 1 — 20 marks
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2016 SQA Higher Chemistry MCQS With Answers
1. Particles with the same electron arrangement are said to be isoelectronic.
Which of the following compounds contains ions which are isoelectronic?
- A Na2S
- B MgCl2
- C KBr
- D CaCl2
2. Which line in the table is correct for the polar covalent bond in hydrogen chloride?
Relative position of
3. Which of the following compounds has the greatest ionic character?
- A Caesium fluoride
- B Caesium iodide
- C Sodium fluoride
- D Sodium iodide
4. The diagram below shows the energy profiles for a reaction carried out with and without a
What is the enthalpy change, in kJ mol–1, for the catalysed reaction?
- A –100
- B –50
- C +50
- D +100
5. Limonene is a terpene molecule present in lemons.
How many isoprene units are joined together in a limonene molecule?
- A 1
- B 2
- C 3
- D 4
6. The following molecules give flavour to food.
Which of the following flavour molecules would be most likely to be retained in the food
when the food is cooked in water?
7. vegetable oil vegetable fat
Which of the following reactions brings about the above change?
- A Hydrolysis
- B Condensation
- C Hydrogenation
- D Dehydrogenation
8. The rate of hydrolysis of protein, using an enzyme, was studied at different temperatures.
Which of the following graphs would be obtained?
9. Which of the following is the salt of a long-chain fatty acid?
- A Fat
- B Oil
- C Soap
- D Glycerol
10. Emulsifiers for use in food are commonly made by reacting edible oils with
- A esters
- B glycerol
- C fatty acids
- D amino acids.
11. The equation for the reduction reaction taking place when ethanal reacts with Tollens’
- A Cu2+(aq) + e− → Cu+(aq)
- B Ag+(aq) + e− → Ag(s)
- C Cr2O72−(aq) + 14H+(aq) + 6e− → 2Cr3+(aq) + 7H2O(ℓ)
- D MnO4−(aq) + 8H+(aq) + 5e− → Mn2+(aq) + 4H2O(ℓ)
12. The name of the compound with structure:
- A 2,3-dimethylpentan-4-one
- B 2,3-dimethylpentan-2-al
- C 3,4-dimethylpentan-2-one
- D 3,4-dimethylpentan-2-al.
2·00 g of calcium carbonate (CaCO3) was reacted with 200 cm3
of 0·1 mol l−1nitric acid (HNO3).
Take the volume of 1 mole of carbon dioxide to be 24 litres.
In the reaction
- A CaCO3 is the limiting reactant
- B an excess of 0·1 mol of nitric acid remains at the end of the reaction
- C 1·64 g of calcium nitrate is produced by the reaction
- D 480 cm3of carbon dioxide is produced by the reaction.
14. The mean bond enthalpy of a C – F bond is 484 kJ mol−1.
In which of the processes is DH approximately equal to +1936 kJ mol−1?
- A CF4(g) → C(s) + 2F2(g)
- B CF4(g) → C(g) + 4F(g)
- C CF4(g) → C(g) + 2F2(g)
- D CF4(g) → C(s) + 4F(g)
15. In a reversible reaction, equilibrium is reached when
- A molecules of reactants cease to change into molecules of products
- B the concentrations of reactants and products are equal
- C the concentrations of reactants and products are constant
- D the activation energy of the forward reaction is equal to that of the reverse reaction.
16. Which of the following equations represents the enthalpy of combustion of propane?
- A C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(ℓ)
- B C3H8(g) + 72 O2(g) → 3CO(g) + 4H2O(ℓ)
- C C3H8(g) + 3O2(g) → 3CO2(g) + 4H2(g)
- D C3H8(g) + 32 O2(g) → 3CO(g) + 4H2(g)
17. An oxidising agent
- A gains electrons and is oxidised
- B loses electrons and is oxidised
- C gains electrons and is reduced
- D loses electrons and is reduced.
18. During a redox process in acid solution, chlorate ions, ClO3−(aq), are converted intochlorine, Cl2(g).
ClO3−(aq) → Cl2(g)
The numbers of H+(aq) and H2O(ℓ) required to balance the ion-electron equation for the
formation of 1 mol of Cl2(g) are, respectively
- A 3 and 6
- B 6 and 3
- C 6 and 12
- D 12 and 6.
19. Which of the following ions could be used to oxidise iodide ions to iodine? 2I−(aq) → I2(s) + 2e−
- A SO42−(aq)
- B SO32−(aq)
- C Cr3+(aq)
- D Cr2O72−(aq)
A student was carrying out a titration to establish the concentration of vitamin C using
Which of the following would help the student achieve a precise end-point?
- A Placing a white tile underneath the conical flask
- B Using the bottom of the meniscus when reading the burette
- C Repeating titrations
- D Carrying out a rough titration first