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2019 SQA Higher Chemistry MCQS With Answers

1. Hydrogen will form a non-polar covalent bond with an element that has an electronegativity
value of
  • A 0·9
  • B 1·5
  • C 2·2
  • D 2·5.

Ans C

2. Which of the following is a polar molecule?

  • A CCl4
  • B NH3
  • C CO2
  • D CH4

Ans B

3. Which of the following is most likely to act as a reducing agent?

  • A CO
  • B MnO4-
  • C H2O2
  • D Cr2O72-

Ans A

4. The following reactions take place when nitric acid is added to zinc.

How many moles of Zn(s) are oxidised by one mole of NO3-(aq)?

  • A 0·67
  • B 1·0
  • C 1·5
  • D 2·0

Ans C

5. Which of the following compounds is a tertiary alcohol?

  • A 2,2-dimethylpropan-1-ol
  • B 2-methylbutan-2-ol
  • C pentan-3-ol
  • D 3-methylbutan-2-ol

Ans B

6. Molecule X has the structure


Which of the following could be produced by partial hydrolysis of X?

Ans A

7. A compound with molecular formula C6H12O2 could be

  • A pentyl ethanoate
  • B hexan-2-one
  • C 3-methylpentan-2-ol
  • D hexanoic acid.

Ans D

8. Compound X reacted with hot copper(II) oxide and the resulting product did not give a
colour change when heated with Fehling’s solution.
Compound X could be

  • A pentan-1-ol
  • B pentan-2-ol
  • C pentan-3-one
  • D pentanoic acid.

Ans B

9. The structure of pivalic acid is shown.

Which of the following is the correct systematic name of pivalic acid?

  • A pentanoic acid
  • B 2,2,2-trimethylethanoic acid
  • C 2-ethylpropanoic acid
  • D 2,2-dimethylpropanoic acid

Ans D

10. The table shows four compounds that contribute to the aroma of spices.
Which compound is not derived from a terpene?

Ans D

11. Which reaction can be classified as reduction?

  • A methanol ↓ methanoic acid
  • B propanal ↓ propanoic acid
  • C butan-2-one ↓ butan-2-ol
  • D propan-2-ol ↓ propanone

Ans C

12. A secondary amine has two carbon atoms directly bonded to the nitrogen atom.
Which of the following is a secondary amine?

Ans B
13. The number of moles of ions in 1 mol of copper(II) phosphate is

  • A 1
  • B 2
  • C 3
  • D 5.

Ans D

14. Which of the following gas samples has the same volume as 4·0 g of methane, CH4?
(All volumes are measured at the same temperature and pressure.)

  • A 1·0 g of helium
  • B 1·0 g of hydrogen
  • C 3·5 g of nitrogen
  • D 35·5 g of chlorine

Ans A

15. Magnesium carbonate reacts with nitric acid.
  MgCO3(s) + 2HNO3(aq) ↓ Mg(NO3)2(aq) + H2O(ℓ) + CO2(g)
0·05 mol of magnesium carbonate was added to a solution containing 0·06 mol of nitric acid.
Which of the following statements is true?

  • A 0·05 mol of carbon dioxide is produced
  • B 0·06 mol of magnesium nitrate is produced
  • C Magnesium carbonate is in excess by 0·02 mol
  • D Nitric acid is in excess by 0·01 mol

Ans C

16. In which of the following diagrams does the dotted line represent a

permanent dipole-permanent dipole interaction between propanone molecules?

Ans D

17. Iron can be produced from iron(III) oxide.
              2Fe2O3(s) + 3C(s) ↓ 4Fe(s) + 3CO2(g)
             GFM = 159∙6 g GFM = 12·0 g GFM = 55∙8 g GFM = 44·0 g

The atom economy for the production of iron is

  • A 69∙9%
  • B 62∙8%
  • C 58∙2%
  • D 32∙5%.

Ans B

18. 100 cm3of propane is mixed with 600 cm3of oxygen and the mixture is ignited.
C3H8(g) + 5O2(g) ↓ 3CO2(g) + 4H2O(ℓ)
At the end of the reaction, the total volume of gas would be

  • A 300 cm3
  • B 400 cm3
  • C 700 cm3
  • D 800 cm3.

Ans B

19. A two-step reaction is shown below.

The first step gave a yield of 60% and the second step a yield of 90%.
The overall yield would be

  • A  30%
  • B  54%
  • C  67%
  • D 150%.

Ans B

20. The volume of hydrogen gas given off against time when an excess of zinc lumps is added to
100 cm3 of 1 mol l-1 hydrochloric acid is shown.

Which of the following graphs would show the volume of hydrogen gas given off when an
excess of zinc powder was added to 50 cm3 of 1 mol l-1hydrochloric acid?

Ans C

21. Consider the reaction pathway shown below.

According to Hess’s Law

  • A b = a – c – d
  • B b = a + c + d
  • C b = d – c + a
  • D b = d + c – a.

Ans A

22. Which of the following is not a factor that affects the rate of a reaction?

  • A Activation energy
  • B Kinetic energies of reactant molecules
  • C Concentration of reactants
  • D Enthalpy change of reaction

Ans D

23. In which of the following reactions would the yield of product be increased by lowering the
pressure?

  • A H2(g) + I2(g) ∏ 2HI(g)
  • B N2(g) + 3H2(g) ∏ 2NH3(g)
  • C N2O4(g) ∏ 2NO2(g)
  • D CO(g) + 2H2(g) ∏ CH3OH(g)

Ans C

24. The graph shows the distribution of kinetic energies for a reaction involving two gases.

Ans A

25. Alkenes react with ozone, O3, to form ozonides which can be decomposed to give carbonyl
compounds.

Ans D

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