SECTION 1 — 25 marks

                                                  2018 National 5 SQA Chemistry MCQS With Answers

1. Which of the following changes would not speed up a chemical reaction?

  • A Increasing the particle size
  • B Increasing the temperature
  • C Increasing the concentration
  • D Addition of a catalyst

Ans A

2. Which line in the table identifies the correct location of a proton and an electron in an
atom?
                                 Proton                                Electron

  • A                  inside the nucleus               inside the nucleus
  • B                  inside the nucleus         outside the nucleus
  • C                 outside the nucleus                outside the nucleus
  • D                 outside the nucleus                 inside the nucleus

Ans B

3. Which of the following elements does not exist as diatomic molecules?

  • A Oxygen
  • B Helium
  • C Bromine
  • D Hydrogen

Ans B

4. The shapes of some molecules are shown below.

The shape of a molecule of hydrogen bromide is likely to be

  • A tetrahedral
  • B trigonal pyramidal
  • C angular
  • D linear.

Ans D

5. Which of the following elements forms an ion with a single positive charge and an electron
arrangement of 2,8?
You may wish to use the data booklet to help you.

  • A Sodium
  • B Magnesium
  • C Fluorine
  • D Neon

Ans A

6. Which line in the table shows the properties of a covalent network compound?

Ans D

7. 0·1 mol of sodium hydroxide was dissolved in water and the solution made up to 250 cm3
What is the concentration, in mol l-1, of the sodium hydroxide solution?

  • A 0·0004
  • B 0·025
  • C 0·4
  • D 2·5

Ans C

8. An alkaline solution contains

  • A only hydroxide ions
  • B more hydroxide ions than hydrogen ions
  • C more hydrogen ions than hydroxide ions
  • D equal numbers of hydrogen ions and hydroxide ions.

Ans B

9. A student made some statements about the effect of adding water to an acidic solution.
Identify the correct statement.

  • A The pH of the solution will remain the same.
  • B The pH of the solution will decrease.
  • C The hydrogen ion concentration will decrease.
  • D The hydrogen ion concentration will increase.

Ans C

10. The shortened structural formula for a compound is
             CH3CH2CH(CH3)CH(CH3)CH2CH2CH3
Which of the following is another way of representing this structure?

Ans B

11. Identify which of the following is an isomer of

Ans C

12. Which of the following reactions takes place when an alcohol is formed from an alkene?

  • A Hydrogenation
  • B Combustion
  • C Hydration
  • D Reduction

Ans C

13.

The systematic name for the above compound is

  • A pentan-2-ol
  • B pentan-4-ol
  • C 1-methylbutan-3-ol
  • D 4-methylbutan-2-ol.

Ans D

14. Which of the following alcohols is the least soluble in water?

  • A Butan-1-ol
  • B Hexan-1-ol
  • C Pentan-1-ol
  • D Propan-1-ol

Ans C

15. A student set up an experiment to determine the quantity of energy released when a
hydrocarbon burns.
Which of the following diagrams shows the apparatus which would produce the most
accurate result?

Ans B

16. The ether, 1-ethoxypropane, can be made by the Williamson reaction.

The structural formula for another ether is shown below.


Which of the following pairs of compounds would react together to produce
2-ethoxypropane?

Ans C

17. Information about the reactions of four different metals, W, X, Y and Z is given in the table.
Metal Reaction with dilute acid Reaction with water

The order of reactivity of the metals, starting with the most reactive is

  • A X, Z, W, Y
  • B Y, W, Z, X
  • C Z, X, W, Y
  • D Y, W, X, Z.

Ans A

18. The ion-electron equations for the oxidation and reduction steps in the reaction between

hydrogen and oxygen are given below.

H2(g)                         ↓ 2H+   (aq) + 2e

2H2O(ℓ)  + O2(g) + 4e- ↓ 4OH-(aq)

The redox equation for the overall reaction is

Ans B

19. Which of the following metals, when connected to lead in a cell, would produce the highest
reading on the voltmeter?
You may wish to use the data booklet to help you.

  • A Zinc
  • B Tin
  • C Nickel
  • D Lead

Ans A

20. Which of the following salts would not be used as a fertiliser?

  • A Ammonium chloride
  • B Ammonium phosphate
  • C Sodium chloride
  • D Sodium phosphate

Ans C

21. Which metal is used as the catalyst in the industrial manufacture of ammonia?

  • A Nickel
  • B Platinum
  • C Iron
  • D Rhodium

Ans C

  • 22. The diagram shows the path of two different types of radiation as they pass through an
    electric field.

    Which line in the table correctly identifies the types of radiation which follow paths
    X and Y?
                            Path X                  Path Y
    A                        alpha                        beta
  • B                        beta                            alpha
  • C                       beta                           gamma
  • D                       alpha                         gamma

Ans A

23. Metallic bonding is a force of attraction between

  • A a shared pair of electrons and two nuclei
  • B negative ions and delocalised electrons
  • C negative ions and positive ions
  • D positive ions and delocalised electrons.

Ans D

24. 2K+(aq) + 2I–(aq) + Pb2+(aq) + 2NO3−(aq) ↓ PbI2(s) + 2K+(aq) + 2NO3−(aq)
The type of reaction represented by this equation is

  • A neutralisation
  • B precipitation
  • C addition
  • D redox.

Ans B

25. A student prepared a sample of copper sulfate crystals by reacting excess copper carbonate
with acid.

Which line in the table shows the correct order in which this experiment would be carried
out?

  • A Y, X, Z
  • B X, Y, Z
  • C Z, Y, X
  • D Y, Z, X

Ans D

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