Acids, bases and salts: past paper questions

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• Question 18May/June 2026, paper 11Multiple choice1 markHas a diagram

  Copper(II) hydroxide is insoluble in water. Rubidium hydroxide is soluble in water. Which row describes copper(II) hydroxide and rubidium hydroxide?

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• Question 17Oct/Nov 2025, paper 11Multiple choice1 mark

  Which statement is correct?

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• Question 20Oct/Nov 2024, paper 11Multiple choice1 mark

  Which statement about oxides is correct?

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• Question 20Oct/Nov 2023, paper 11Multiple choice1 mark

  Limewater is aqueous calcium hydroxide. Which statement about limewater is correct?

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• Question 19May/June 2026, paper 11Multiple choice1 mark

  Which ion is present in dilute aqueous propanoic acid?

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• Question 18Oct/Nov 2025, paper 11Multiple choice1 mark

  Some properties of a solid oxide are listed. ● It reacts with dilute sulfuric acid giving a salt and water. ● It is insoluble in water.

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• Question 21Oct/Nov 2023, paper 11Multiple choice1 mark

  Which two oxides will both react with aqueous sodium hydroxide?

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• Question 17May/June 2026, paper 12Multiple choice1 markHas a diagram

  Citric acid is a soluble carboxylic acid. A student does two tests on separate samples of an aqueous solution of citric acid. Which row is correct?

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• Question 19Oct/Nov 2025, paper 11Multiple choice1 mark

  Two compounds are dissolved separately in water. When the two solutions are mixed, there is no observable change. What are the two compounds?

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• Question 21Oct/Nov 2024, paper 12Multiple choice1 mark

  Which solid reacts with dilute hydrochloric acid to produce a gas?

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• Question 18May/June 2026, paper 12Multiple choice1 mark

  Two solutions are prepared. • Solution P is $0.050\text{ mol}\mathrm{/}{\text{dm}}^3$ hydrochloric acid. • Solution Q is $0.100\text{ mol}\mathrm{/}{\text{dm}}^3$ butanoic acid.

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• Question 19Oct/Nov 2025, paper 12Multiple choice1 mark

  In a neutralisation reaction, which change in particles occurs?

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• Question 22Oct/Nov 2024, paper 12Multiple choice1 mark

  Which $1{\text{ mol / dm}}^3$ aqueous solution has the highest pH?

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• Question 40Oct/Nov 2023, paper 11Multiple choice1 markHas a diagram

  A student does two experiments. In experiment 1, ammonium carbonate is reacted with dilute hydrochloric acid. In experiment 2, ammonium carbonate is heated with aqueous sodium hydroxide.

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• Question 19May/June 2026, paper 12Multiple choice1 mark

  The formulae of three oxides are listed. 1 $\text{CuO}$ 2 ${\text{SO}}_2$ 3 $\text{ZnO}$ Which oxides react with $\text{NaOH}(\text{aq})$ to form a salt?

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• Question 20Oct/Nov 2025, paper 12Multiple choice1 mark

  Which pair of substances are both insoluble in water?

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• Question 23Oct/Nov 2024, paper 12Multiple choice1 mark

  Oxide Q reacts with separate samples of dilute hydrochloric acid and aqueous potassium hydroxide. Both reactions produce a salt and water. Which statement is correct?

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• Question 1May/June 2026, paper 21Structured5 marks

  Choose from the following compounds to answer the questions.

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• Question 8Oct/Nov 2025, paper 22Structured9 marksHas a diagram

  Fig. 8.1 shows the displayed formula of an unsaturated carboxylic acid, X. Explain why X is unsaturated.

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• Question 24Oct/Nov 2024, paper 12Multiple choice1 markHas a diagram

  The table shows four methods used to prepare pure salts. Which row shows a method of making a pure sample of each named salt?

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• Question 20Oct/Nov 2023, paper 12Multiple choice1 markHas a diagram

  Information about three oxides, Q, R and T, is given. Q reacts with dilute sulfuric acid to form a salt and water. R reacts with both acids and bases to form a salt and water.

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• Question 5May/June 2026, paper 21Structured14 marks

  Aluminium sulfate is prepared by reacting excess aluminium with hot dilute sulfuric acid.

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• Question 3Oct/Nov 2025, paper 42Structured14 marks

  A student does a series of tests using aqueous solution $\mathbf{P}$ and aqueous solution $\mathbf{Q}$. The tests the student does on $\mathbf{P}$ are shown in Table 3.1. Some of the observations for these tests are also shown.

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• Question 5Oct/Nov 2024, paper 22Structured17 marksHas a diagram

  A student adds large pieces of zinc to dilute hydrochloric acid. The zinc is in excess. Complete the equation by adding state symbols for the products.

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• Question 21Oct/Nov 2023, paper 12Multiple choice1 mark

  Which definition of a hydrated substance is correct?

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• Question 1May/June 2026, paper 22Structured5 marks

  Choose from the following compounds to answer the questions.

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• Question 20May/June 2025, paper 11Multiple choice1 markHas a diagram

  The pH of dilute ethanoic acid is measured. The equation for the partial dissociation of ethanoic acid is shown.

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• Question 1Oct/Nov 2024, paper 42Structured6 marksHas a diagram

  A student does an experiment to make pure hydrated copper(II) sulfate crystals, ${\mathrm{C}\mathrm{u}\mathrm{S}\mathrm{O}}_4\cdot 5{\mathrm{H}}_2\mathrm{O}$. The student makes aqueous copper(II) sulfate by reacting a dilute acid with excess copper(II) oxide. Name the acid.

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• Question 5May/June 2026, paper 22Structured14 marks

  Zinc chloride is prepared by reacting excess zinc with warm dilute hydrochloric acid.

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• Question 21May/June 2025, paper 11Multiple choice1 mark

  Which element reacts with oxygen to produce an amphoteric oxide?

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