The characteristic properties of acids and bases: 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 21Oct/Nov 2024, paper 12Multiple choice1 mark

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

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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 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 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 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 23May/June 2024, paper 11Multiple choice1 markHas a diagram

  Which row describes both the pH and the ion with the greatest concentration in an aqueous alkali?

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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 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 24May/June 2024, paper 11Multiple choice1 mark

  The water in a lake is acidic and the fish are dying. The water in the lake needs to be neutralised so that its pH is close to 7. Which compound is added in excess to neutralise the water in the lake?

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• Question 7Oct/Nov 2023, paper 21Structured11 marks

  Dilute ethanoic acid reacts with aqueous calcium hydroxide.

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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 21May/June 2024, paper 12Multiple choice1 mark

  One mole of compound X gives two moles of ions in aqueous solution. X reacts with ammonium carbonate to give an acidic gas.

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• Question 7Oct/Nov 2023, paper 22Structured11 marks

  Dilute hydrochloric acid reacts with aqueous sodium carbonate.

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• Question 20May/June 2025, paper 12Multiple choice1 markHas a diagram

  The diagram shows the change in pH as a strong alkali is added to a weak acid. $40{\text{ cm}}^3$ of a strong alkali is added to a weak acid and a sample of the solution is tested separately with methyl orange and thymolphthalein. Which row is correct?

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• Question 22May/June 2024, paper 12Multiple choice1 mark

  Which statement about weak acids is correct?

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• Question 16May/June 2023, paper 11Multiple choice1 markHas a diagram

  Universal indicator contains several dyes. The reversible reaction of one dye, $\text{IndOH}$, is shown.

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• Question 21May/June 2025, paper 12Multiple choice1 markHas a diagram

  Which row shows the equations for the dissociation of methanoic acid and of nitric acid?

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• Question 39May/June 2024, paper 12Multiple choice1 markHas a diagram

  Two titrations of dilute hydrochloric acid with aqueous sodium hydroxide are done using two different indicators, methyl orange and thymolphthalein. The equation for the reaction is shown.

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• Question 19May/June 2023, paper 11Multiple choice1 mark

  Samples of $\text{HCl}(\text{aq})$ and ${\text{HNO}}_3(\text{aq})$ are tested using universal indicator paper. The sample of $\text{HCl}(\text{aq})$ has a pH of 4 and the sample of ${\text{HNO}}_3(\text{aq})$ has a pH of 2. Which statement is correct?

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• Question 3May/June 2024, paper 21Structured9 marks

  Aqueous ammonium nitrite decomposes when heated to form nitrogen. $$\mathrm{N}{\mathrm{H}}_4\mathrm{N}{\mathrm{O}}_2(\mathrm{a}\mathrm{q})\to {\mathrm{N}}_2(\mathrm{g})+2{\mathrm{H}}_2\mathrm{O}(\mathrm{l})$$ A $25.0\mathrm{c}{\mathrm{m}}^3$ sample of $0.133\mathrm{m}\mathrm{o}\mathrm{l}\mathrm{/}\mathrm{d}{\mathrm{m}}^3\mathrm{N}{\mathrm{H}}_4\mathrm{N}{\mathrm{O}}_2$ is completely decomposed.

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• Question 20May/June 2023, paper 11Multiple choice1 mark

  Which two substances react to form a salt and water only?

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• Question 3May/June 2024, paper 22Structured10 marks

  Aqueous hydrogen peroxide decomposes when heated to form oxygen.

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• Question 38May/June 2023, paper 11Multiple choice1 mark

  An organic compound, P, is dissolved in water. The concentration of the solution is $0.1\text{ mol}\mathrm{/}{\text{dm}}^3$ and the pH is 3.

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• Question 7May/June 2023, paper 12Multiple choice1 mark

  What is the equation for the reaction between sodium carbonate and dilute nitric acid?

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• Question 21May/June 2023, paper 12Multiple choice1 mark

  Compound X is a gas at room temperature. X dissolves in water to give a solution with a pH of 4.

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