National 5ChemistrySQAExam QuestionsChemical Changes & StructureAcids & Bases

Acids & Bases (SQA National 5 Chemistry): Exam Questions

Exam code: X813 75

16 mins16 questions
1
1 mark

Which of the following oxides, when shaken with water, would give an alkaline solution?

You may wish to use the data booklet to help you.

  • Calcium oxide

  • Nitrogen dioxide

  • Sulfur dioxide

  • Nickel oxide

Choose your answer

2
1 mark

A student made some statements about the effect of adding water to a solution of hydrochloric acid.

Identify the correct statement.

  • The rate of reaction with magnesium will increase.

  • The concentration of H+ ions will increase.

  • The acid will be neutralised.

  • The pH will increase.

Choose your answer

3
1 mark

Which of the following compounds, when added to water, will change its pH?

You may wish to use the data booklet to help you.

  • Aluminium oxide

  • Calcium oxide

  • Copper(II) oxide

  • Zinc(II) oxide

Choose your answer

4
1 mark

25 cm3 of water was added to an aqueous solution of sodium hydroxide.

Compared to the initial sodium hydroxide solution, the final sodium hydroxide solution has

  • a lower number of moles of sodium hydroxide and a higher pH

  • the same number of moles of sodium hydroxide and a higher pH

  • the same number of moles of sodium hydroxide and a lower pH

  • a lower number of moles of sodium hydroxide and a lower pH.

Choose your answer

5
1 mark

Which of the following substances, when shaken with water, would cause the pH of water to increase?

You may wish to use the data booklet to help you.

  • Aluminium oxide

  • Barium oxide

  • Nitrogen oxide

  • Hydrogen oxide

Choose your answer

6
1 mark

Nickel carbonate, nickel hydroxide and nickel metal all react with dilute sulfuric acid.

Which of the following statements is true for all three reactions?

  • A gas is produced

  • Water is produced.

  • Nickel sulfate is produced.

  • A neutralisation reaction takes place.

Choose your answer

7
1 mark

Sodium carbonate can be used to neutralise hydrochloric acid.

(Na+ )2CO3 2− (aq) + 2H+ Cl− (aq) rightwards arrow 2Na+ Cl− (aq) + H2O(ℓ)  + CO2(g)

The correct equation omitting the spectator ions is

  • H+ (aq) + OH− (aq) rightwards arrow H2O(ℓ)

  • 2H+ (aq) + CO3 2− (aq) rightwards arrow H2O(ℓ)  + CO2(g)

  • 2H+ (aq) + CO3 2− (g) rightwards arrow H2O(ℓ)  + CO2(g)

  • Na+ (aq) + Cl− (aq) rightwards arrow Na+ Cl− (aq)

Choose your answer

8
1 mark

A titration was carried out to neutralise 0.002 mol of sulfuric acid solution, H2SO4.

2NaOH(aq) + H2SO4(aq) rightwards arrow Na2SO4(aq) + 2H2O(ℓ)

Diagram of a titration setup with NaOH solution in a burette above a flask containing H2SO4 solution, labelled with concentrations.

The number of moles of NaOH(aq) required to neutralise the acid is

  • 0.05

  • 0.004

  • 0.002

  • 0.001

Choose your answer

9
1 mark

Which of the following compounds is a salt?

  • Calcium oxide

  • Hydrogen nitrate

  • Sodium hydroxide

  • Potassium ethanoate

Choose your answer

10
1 mark

The pH of the solution formed when ammonia is bubbled into water is most likely to be:

  • 3

  • 5

  • 7

  • 9

Choose your answer

11
1 mark

Limewater can be made by dissolving calcium hydroxide in water.

Which of the following terms correctly describes calcium hydroxide?

  • Solute

  • Solvent

  • Solution

  • Insoluble

Choose your answer

12
1 mark

As an alkaline solution is diluted with water

  • the pH increases

  • the pH stays the same

  • the concentration of hydroxide ions increases

  • the concentration of hydroxide ions decreases.

Choose your answer

13
1 mark

Which of the following compounds is a base?

  • Sodium oxide

  • Calcium chloride

  • Potassium nitrate

  • Ammonium sulfate

Choose your answer

14
1 mark

Which of the following ions are spectator ions in the reaction?

  • Ag+ and NO3 −

  • Na+ and NO3 −

  • Ag+ and Br−

  • Na+ and Br−

Choose your answer

15
1 mark

An alkaline solution contains

  • only hydroxide ions

  • more hydroxide ions than hydrogen ions

  • more hydrogen ions than hydroxide ions

  • equal numbers of hydrogen ions and hydroxide ions.

Choose your answer

16
1 mark

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

Identify the correct statement.

  • The pH of the solution will remain the same.

  • The pH of the solution will decrease.

  • The hydrogen ion concentration will decrease.

  • The hydrogen ion concentration will increase.

Choose your answer