Preparation of salts — Paper 1 · IGCSE Chemistry (9-1) 0971

17 Which methods are suitable for preparing both zinc sulfate and copper(II) sulfate? 1 reacting the metal oxide with warm dilute aqueous sulfuric acid 2 reacting the metal with dilute aqueous sulfuric acid 3 reacting the metal carbonate with dilute aqueous sulfuric acid A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: C

This question in 0971/11 May/June 2018

18 How could crystals of a pure salt be prepared from dilute sulfuric acid? A add an excess of aqueous sodium hydroxide, filter, evaporate the filtrate to crystallisation point B add an excess of copper(II) carbonate, filter, evaporate the filtrate to dryness C add an excess of copper metal, filter, evaporate the filtrate to crystallisation point D add an excess of zinc oxide, filter, evaporate the filtrate to crystallisation point

1 marks

Answer: D

This question in 0971/11 May/June 2019

19 A method used to make copper(II) sulfate crystals is shown. 1 Place dilute sulfuric acid in a beaker. 2 Warm the acid. 3 Add copper(II) oxide until it is in excess. 4 Filter the mixture. 5 Evaporate the filtrate until crystals start to form. 6 Leave the filtrate to cool. What are the purposes of step 3 and step 4? step 3 step 4 A to ensure all of the acid has reacted to obtain solid copper(II) sulfate B to ensure all of the acid has reacted to remove the excess of copper(II) oxide C to speed up the reaction to obtain solid copper(II) sulfate D to speed up the reaction to remove the excess of copper(II) oxide

1 marks

Answer: B

This question in 0971/12 Oct/Nov 2019

18 The apparatus shown is used to prepare aqueous copper(II) sulfate. filter paper stirrer excess of solid X solid X Y aqueous copper(II) sulfate heat What are X and Y? X Y A copper aqueous iron(II) sulfate B copper(II) chloride dilute sulfuric acid C copper(II) oxide dilute sulfuric acid D sulfur aqueous copper(II) chloride

1 marks

Answer: C

This question in 0971/11 May/June 2020

18 The apparatus shown is used to prepare aqueous copper(II) sulfate. filter paper stirrer excess of solid X solid X Y aqueous copper(II) sulfate heat What are X and Y? X Y A copper aqueous iron(II) sulfate B copper(II) chloride dilute sulfuric acid C copper(II) oxide dilute sulfuric acid D sulfur aqueous copper(II) chloride

1 marks

Answer: C

This question in 0971/12 May/June 2020

24 A student carries out an experiment to prepare pure magnesium sulfate crystals. The diagram shows the first stage of the preparation. stirrer magnesium carbonate dilute sulfuric acid He adds magnesium carbonate until no more reacts. Which process should he use for the next stage? A crystallisation B evaporation C filtration D neutralisation

1 marks

Answer: C

This question in 0971/12 Oct/Nov 2020

32 A white solid Z reacts with dilute hydrochloric acid to produce a gas. The same gas is produced when compound Z is heated strongly. What is Z? A calcium B calcium carbonate C calcium hydroxide D calcium oxide

1 marks

Answer: B

This question in 0971/11 May/June 2021

19 In the preparation of zinc sulfate crystals, excess zinc oxide is added to dilute sulfuric acid. Why is an excess of zinc oxide added? A to make sure crystals are formed and not powder B to avoid filtering the mixture C to use up all of the sulfuric acid D to use up all of the zinc oxide

1 marks

Answer: C

This question in 0971/12 Oct/Nov 2021

17 Which products are formed when magnesium hydroxide reacts with hydrochloric acid? A magnesium chloride, carbon dioxide and water B magnesium chloride, hydrogen and water C magnesium chloride and hydrogen only D magnesium chloride and water only

1 marks

Answer: D

This question in 0971/11 May/June 2022

19 An acid is neutralised by adding an excess of an insoluble solid base. A soluble salt is formed. How is the pure salt obtained from the reaction mixture? A crystallisation  evaporation  filtration B evaporation  crystallisation  filtration C filtration  crystallisation  evaporation D filtration  evaporation  crystallisation

1 marks

Answer: D

This question in 0971/11 May/June 2022

19 An acid is neutralised by adding an excess of an insoluble solid base. A soluble salt is formed. How is the pure salt obtained from the reaction mixture? A crystallisation  evaporation  filtration B evaporation  crystallisation  filtration C filtration  crystallisation  evaporation D filtration  evaporation  crystallisation

1 marks

Answer: D

This question in 0971/12 May/June 2022

18 Copper(II) sulfate is made by reacting excess insoluble solid M and solution N. Which row identifies M and N and the method used to extract crystals of copper(II) sulfate from the mixture? M N method A copper sodium sulfate crystals are filtered out from the mixture B copper sulfuric acid mixture is filtered and the filtrate evaporated until crystals form C copper(II) carbonate sulfuric acid mixture is filtered and the filtrate evaporated until crystals form D copper(II) oxide sulfuric acid mixture is filtered and the residue dried

1 marks

Answer: C

This question in 0971/12 Oct/Nov 2022

31 Four reactions are shown. 1 2 copper(II) carbonate dilute hydrochloric acid calcium carbonate 3 4 dilute hydrochloric acid ethanol magnesium Which reactions produce water? A 1 and 2 B 1 and 3 C 2, 3 and 4 D 3 and 4 only

1 marks

Answer: B

This question in 0971/12 Oct/Nov 2022

17 A student makes aqueous copper(II) chloride by adding excess copper(II) carbonate to dilute hydrochloric acid. What is the next step in the method in the formation of solid copper(II) chloride? A crystallisation B evaporation C filtration D titration

1 marks

Answer: C

This question in 0971/11 May/June 2023

15 Copper(II) chloride is made when copper(II) carbonate reacts with dilute hydrochloric acid. What are the other products in this reaction? A water and carbon dioxide B carbon dioxide only C water and hydrogen D hydrogen only

1 marks

Answer: A

This question in 0971/12 May/June 2023

17 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? A Excess sulfuric acid is reacted with magnesium oxide. The mixture is evaporated to dryness. B Excess sulfuric acid is reacted with magnesium oxide. The precipitate is filtered, washed and dried. C Sulfuric acid is reacted with excess magnesium oxide. The mixture is filtered and the filtrate is evaporated to dryness. D Sulfuric acid is reacted with excess magnesium oxide. The precipitate is filtered, washed and dried.

1 marks

Answer: C

This question in 0971/12 May/June 2023

36 What is the formula of the salt formed when aqueous ethanoic acid reacts with calcium carbonate? A Ca(CH3COOH)2 B Ca(CH3COO)2 C Ca2CH3COOH D Ca2CH3COO

1 marks

Answer: B

This question in 0971/12 May/June 2023

18 Which products are formed when magnesium carbonate reacts with dilute hydrochloric acid? A carbon dioxide, hydrogen and magnesium chloride B carbon dioxide and magnesium chloride only C carbon dioxide, water and magnesium chloride D water and magnesium chloride only

1 marks

Answer: C

This question in 0971/12 Oct/Nov 2023

20 Which salt is insoluble? A barium sulfate B lead(II) nitrate C magnesium chloride D sodium carbonate

1 marks

Answer: A

This question in 0971/12 Oct/Nov 2023

20 A titration method is used to prepare a pure soluble sulfate salt from dilute sulfuric acid. What is the other reagent? A copper(II) oxide B magnesium C sodium hydroxide D zinc carbonate

1 marks

Answer: C

This question in 0971/11 May/June 2024

28 Which reaction produces carbon dioxide? A cracking of large hydrocarbon molecules B photosynthesis C reaction of a base with a carbonate D thermal decomposition of calcium carbonate

1 marks

Answer: D

This question in 0971/11 May/June 2024

22 Which substances can be used to make pure crystals of sodium sulfate? A potassium sulfate and sodium hydroxide B sodium carbonate and sulfuric acid C sodium nitrate and magnesium sulfate D sulfuric acid and sodium chloride

1 marks

Answer: B

This question in 0971/12 May/June 2024

9 Which symbol equation represents the reaction between aqueous sodium hydroxide and dilute sulfuric acid? A Na2OH + H2SO4  2NaSO4 + H2O B Na(OH)2 + H2SO4  Na2SO4 + 2H2O C 2NaOH + H2SO4  2NaSO4 + 2H2O D 2NaOH + H2SO4  Na2SO4 + 2H2O

1 marks

Answer: D

This question in 0971/12 Oct/Nov 2024

23 The following steps are done to prepare solid magnesium sulfate. 1 filtration 2 measurement of 20 cm3 of dilute sulfuric acid using a measuring cylinder 3 evaporation 4 addition of an excess of solid magnesium carbonate to dilute sulfuric acid What is the correct order for these steps? A 2  4  3  1 B 2  4  1  3 C 4  2  1  3 D 4  2  3  1

1 marks

Answer: B

This question in 0971/12 Oct/Nov 2024

19 Which reactants are used to make the salt copper(II) sulfate? A dilute acid + alkali B dilute acid + metal carbonate C dilute acid + metal D dilute acid + non-metal oxide

1 marks

Answer: B

This question in 0971/11 May/June 2025

19 Which substances react with dilute hydrochloric acid to form aqueous copper(II) chloride? 1 copper 2 copper(II) oxide 3 copper(II) carbonate 4 copper(II) hydroxide A 1, 2, 3 and 4 B 1, 2 and 3 only C 2, 3 and 4 only D 2 and 3 only

1 marks

Answer: C

This question in 0971/12 Oct/Nov 2025