Preparation of salts — Paper 1 · IGCSE Science - Combined 0653

23 Which of the reactions shown is a thermal decomposition? A calcium carbonate → calcium oxide + carbon dioxide B methane + air → carbon dioxide + water C sodium carbonate + hydrochloric acid → sodium chloride + water + carbon dioxide D sodium hydroxide + hydrochloric acid → sodium chloride + water

1 marks

Answer: A

This question in 0653/11 Oct/Nov 2005

22 Aqueous sodium hydrogensulphate reacts with aqueous sodium hydroxide as shown. In this reaction, the sodium hydrogensulphate loses hydrogen. sodium hydrogensulphate + sodium hydroxide — sodium sulphate + water NaHSQ, + NaOH > NazSO, +H20 Which terms apply to sodium hydrogensulphate in this reaction? acid alkali salt A v x x B v x v Cc x v x D x v v

1 marks

Answer: B

This question in 0653/11 May/June 2006

22 The contents of the labelled beakers shown are mixed. dilute HNO3 MgCO3 Which salt is formed? A magnesium nitrate B magnesium sulfate C manganese nitrate D manganese sulfate

1 marks

Answer: A

This question in 0653/11 May/June 2009

19 Copper(II) sulfate is prepared by reacting copper(II) oxide with dilute sulfuric acid. CuO(s) + H2SO4(aq) → CuSO4(aq) + H2O(I) Which statement is correct? A Excess copper(II) oxide is used because it can be easily removed by filtration. B Excess copper(II) oxide is used because it can be easily removed by reacting with more sulfuric acid. C Excess sulfuric acid is used because it can be easily removed by evaporation. D Excess sulfuric acid is used because unreacted copper(II) oxide would contaminate the product.

1 marks

Answer: A

This question in 0653/12 May/June 2013

16 The contents of the two beakers shown are mixed. dilute HNO3 MgCO3 Which salt is formed? A magnesium nitrate B magnesium sulfate C manganese nitrate D manganese sulfate

1 marks

Answer: A

This question in 0653/11 Oct/Nov 2014

17 The contents of the two beakers shown are mixed. dilute HNO3 MgCO3 Which salt is formed? A magnesium nitrate B magnesium sulfate C manganese nitrate D manganese sulfate

1 marks

Answer: A

This question in 0653/12 Oct/Nov 2014

21 Copper sulfate crystals are prepared by reacting copper oxide with sulfuric acid. Which process is not used in the preparation of copper sulfate crystals? A chromatography B crystallisation C evaporation D filtration

1 marks

Answer: A

This question in 0653/13 Oct/Nov 2015

21 Magnesium hydroxide is an insoluble solid. Magnesium sulfate is a soluble solid which is formed when magnesium hydroxide reacts with sulfuric acid. Which method is used to make pure magnesium sulfate? A React excess dilute sulfuric acid with magnesium hydroxide, filter and crystallise. B React excess dilute sulfuric acid with magnesium hydroxide then evaporate until dry. C React excess magnesium hydroxide with dilute sulfuric acid, filter and crystallise. D React excess magnesium hydroxide with dilute sulfuric acid then evaporate until dry.

1 marks

Answer: C

This question in 0653/11 May/June 2017

21 Magnesium sulfate is a soluble solid produced by reacting excess solid magnesium oxide with dilute sulfuric acid. Which processes produce pure magnesium sulfate crystals? A distilling the reaction mixture and leaving the distillate to crystallise B evaporating the water from the reaction mixture C filtering and drying the solid from the reaction mixture D filtering the reaction mixture and leaving the filtrate to crystallise

1 marks

Answer: D

This question in 0653/12 May/June 2017

21 Magnesium sulfate is a soluble solid produced by reacting excess solid magnesium oxide with dilute sulfuric acid. Which processes produce pure magnesium sulfate crystals? A distilling the reaction mixture and leaving the distillate to crystallise B evaporating the water from the reaction mixture C filtering and drying the solid from the reaction mixture D filtering the reaction mixture and leaving the filtrate to crystallise

1 marks

Answer: D

This question in 0653/13 May/June 2017

22 What reacts with dilute hydrochloric acid to make magnesium chloride? 1 magnesium 2 magnesium carbonate 3 magnesium oxide A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: A

This question in 0653/12 Feb/March 2018

22 Compound X reacts with compound Y to form sodium sulfate, water and carbon dioxide. What are X and Y? X Y A sodium carbonate hydrochloric acid B sodium carbonate sulfuric acid C sodium hydroxide hydrochloric acid D sodium hydroxide sulfuric acid

1 marks

Answer: B

This question in 0653/12 Oct/Nov 2018

20 Copper nitrate is prepared by reacting excess copper oxide with dilute nitric acid. How is a solid sample of copper nitrate obtained from the reaction mixture? A Add an excess of dilute nitric acid. B Distil the solution. C Filter the solution and dry the residue in the filter paper. D Filter the solution and crystallise the filtrate.

1 marks

Answer: D

This question in 0653/12 Feb/March 2019

21 Which substances react with dilute sulfuric acid to make copper sulfate? 1 copper 2 copper carbonate 3 copper hydroxide 4 copper nitrate A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

1 marks

Answer: C

This question in 0653/11 Oct/Nov 2020

19 The diagram shows an experiment to prepare a salt from compounds P and Q. aqueous P stirrer aqueous Q + Universal Indicator Aqueous Q has a pH value of 1. Aqueous P is added until the pH value of the mixture reaches 7. What are the formulae of compounds P and Q? compound P compound Q A HCl NaOH B HNO3 H2SO4 C KOH HCl D NaOH NH3

1 marks

Answer: C

This question in 0653/12 May/June 2021

18 Potassium nitrate can be made by the reaction of dilute nitric acid and aqueous potassium hydroxide. Bottles containing four different aqueous solutions are shown. 1 2 3 4 HNO3 KOH NaOH KNO3 Which aqueous solutions are used to make potassium nitrate? A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

1 marks

Answer: A

This question in 0653/13 May/June 2022

21 Dilute sulfuric acid reacts with aqueous potassium hydroxide. What are the products of this reaction? potassium potassium carbon water hydroxide sulfate dioxide A J x Jv Jv B x Jv x JV Cc x J Jv Jv D x Jv x x key /=yes X =no

1 marks

Answer: B

This question in 0653/12 May/June 2023

22 Which two substances both react with dilute sulfuric acid to make the salt magnesium sulfate? A magnesium carbonate and magnesium chloride B magnesium chloride and magnesium nitrate C magnesium oxide and magnesium carbonate D magnesium oxide and magnesium nitrate

1 marks

Answer: C

This question in 0653/13 May/June 2023

24 Which substance does not react with dilute hydrochloric acid to produce copper chloride? A copper B copper carbonate C copper hydroxide D copper oxide

1 marks

Answer: A

This question in 0653/12 Oct/Nov 2023

20 The steps needed to make pure, dry magnesium sulfate crystals from magnesium oxide and dilute sulfuric acid are listed. 1 filter 2 leave to cool 3 add excess magnesium oxide to sulfuric acid and heat 4 dry 5 filter and wash 6 heat to evaporate some of the water In which order are these steps carried out? A 3  1  2  5  6  4 B 3  1  6  2  5  4 C 3  2  1  6  4  5 D 3  5  2  6  1  4

1 marks

Answer: B

This question in 0653/12 Oct/Nov 2024

20 The steps needed to make pure, dry magnesium sulfate crystals from magnesium oxide and dilute sulfuric acid are listed. 1 filter 2 leave to cool 3 add excess magnesium oxide to sulfuric acid and heat 4 dry 5 filter and wash 6 heat to evaporate some of the water In which order are these steps carried out? A 3  1  2  5  6  4 B 3  1  6  2  5  4 C 3  2  1  6  4  5 D 3  5  2  6  1  4

1 marks

Answer: B

This question in 0653/13 Oct/Nov 2024

27 Excess solid zinc carbonate is added to dilute hydrochloric acid in a beaker. When the reaction is complete, the beaker contains a mixture of unreacted solid zinc carbonate in a solution of zinc chloride. zinc chloride solid solution zinc carbonate Which processes are used to obtain crystals of zinc chloride from this mixture? A filtration and distillation B filtration and evaporation C filtration and oxidation D oxidation and evaporation

1 marks

Answer: B

This question in 0653/11 May/June 2025

22 Sodium nitrate, NaNO3, is a soluble salt. Which method is used to make pure solid sodium nitrate? A Add aqueous sodium hydroxide to a conical flask, titrate with dilute nitric acid, then crystallise. B Dissolve solid sodium chloride in dilute nitric acid, leave for 10 minutes and then crystallise. C Heat sodium with nitrogen and oxygen. Let the mixture cool, then collect the solid that is made. D Mix copper nitrate and sodium chloride solutions, then filter the mixture and collect the sodium nitrate from the filter paper.

1 marks

Answer: A

This question in 0653/13 May/June 2025

27 Which method is used to obtain a sample of pure, solid salt from an aqueous solution of the salt? A chromatography B crystallisation C filtration D fractional distillation

1 marks

Answer: B

This question in 0653/11 Oct/Nov 2025