Acids, bases and salts: past paper questions

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• Question 20May/June 2026, paper 11Multiple choice1 markHas a diagram

  Thymolphthalein and methyl orange are separately added to test-tubes containing aqueous potassium hydroxide. What is the final colour of the solution in each test-tube?

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

  Which pair of reactants are both soluble in water and mix to form a precipitate?

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• Question 7Oct/Nov 2024, paper 11Multiple choice1 mark

  Metal X is in Group II of the Periodic Table. X is reacted separately with dilute sulfuric acid and with oxygen. Which row identifies the products of each reaction?

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• Question 16Oct/Nov 2023, paper 11Multiple choice1 mark

  Which solids react with dilute sulfuric acid to form aqueous magnesium sulfate?

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• Question 21May/June 2026, paper 11Multiple choice1 mark

  Copper(II) chloride is made when copper(II) carbonate reacts with dilute hydrochloric acid. What are the other products in this reaction?

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

  Four oxides are listed. 1 lithium oxide 2 phosphorus oxide 3 sodium oxide 4 sulfur dioxide Which oxides are basic?

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• Question 17Oct/Nov 2024, paper 11Multiple choice1 mark

  Which statements about dilute ethanoic acid are correct?

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• Question 17Oct/Nov 2023, paper 11Multiple choice1 mark

  Which statements about an aqueous acid are correct?

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• Question 22May/June 2026, paper 11Multiple choice1 mark

  Dilute acid HA has a pH of 2 and dilute acid HX has a pH of 4. Both acids have the same concentration. Which statement is correct?

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

  Which substances react with dilute hydrochloric acid to form aqueous copper(II) chloride?

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• Question 18Oct/Nov 2024, paper 11Multiple choice1 markHas a diagram

  An aqueous solution of Z turns universal indicator paper purple.

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• Question 18Oct/Nov 2023, paper 11Multiple choice1 mark

  Copper(II) sulfate is formed by reacting excess solid copper(II) carbonate with dilute sulfuric acid. Which processes are part of the preparation of solid copper(II) sulfate?

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• Question 23May/June 2026, paper 11Multiple choice1 mark

  Which oxide forms a basic solution in water?

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• Question 19Oct/Nov 2024, paper 11Multiple choice1 markHas a diagram

  Which row describes the solubility of lead(II) chloride and lead(II) sulfate in water?

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• Question 15Oct/Nov 2023, paper 12Multiple choice1 markHas a diagram

  Zinc reacts slowly with dilute sulfuric acid at room temperature. Bubbles of a gas, L, form on the surface of the zinc. When a small amount of copper is added, the reaction is faster.

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• Question 24May/June 2026, paper 11Multiple choice1 mark

  Copper(II) sulfate is prepared by adding copper(II) oxide to dilute sulfuric acid. The steps used to obtain copper(II) sulfate crystals are listed. 1 Warm the filtrate until concentrated.

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• Question 18Oct/Nov 2025, paper 13Multiple choice1 markHas a diagram

  Base Q dissolves in water to make aqueous Q. Aqueous Q is tested with thymolphthalein. Which row gives the colour of thymolphthalein in aqueous Q and the ion responsible for this colour?

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

  Four different groups of oxides are shown.

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• Question 18Oct/Nov 2023, paper 12Multiple choice1 mark

  Which products are formed when magnesium carbonate reacts with dilute hydrochloric acid?

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• Question 16May/June 2026, paper 12Multiple choice1 mark

  Farmers add calcium oxide (lime) and ammonium salts to their fields. The compounds are not added at the same time because they react with each other. Which gas is produced in this reaction?

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• Question 19Oct/Nov 2025, paper 13Multiple choice1 mark

  Solid calcium hydroxide is added to aqueous ammonium chloride and the mixture is warmed.

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• Question 21Oct/Nov 2024, paper 11Multiple choice1 mark

  Four steps in the preparation of a soluble salt from a dilute acid and a solid metal oxide are listed. 1 Warm the dilute acid. 2 Evaporate the solution to half of its volume and allow to cool.

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• Question 19Oct/Nov 2023, paper 12Multiple choice1 mark

  Which element forms an oxide that reacts with an aqueous solution of a base?

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

  Which row identifies the universal indicator colour, pH and hydrogen ion concentration for the stated solution?

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• Question 22Oct/Nov 2025, paper 13Multiple choice1 mark

  Which three compounds are all insoluble in water?

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• Question 9Oct/Nov 2024, paper 12Multiple choice1 mark

  Which symbol equation represents the reaction between aqueous sodium hydroxide and dilute sulfuric acid?

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• Question 20Oct/Nov 2023, paper 12Multiple choice1 mark

  Which salt is insoluble?

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

  Magnesium sulfate is a soluble solid which is formed when insoluble magnesium oxide reacts with dilute sulfuric acid. Which method is used to prepare solid magnesium sulfate?

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• Question 34Oct/Nov 2025, paper 13Multiple choice1 markHas a diagram

  The equation shows the reaction between ethanoic acid and solid P to produce Q and hydrogen.

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• Question 20Oct/Nov 2024, paper 12Multiple choice1 mark

  Compound M contains calcium. Two reactions of M are listed. ● M reacts with dilute hydrochloric acid to form a salt and water only.

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