Identification of ions and gases — Paper 2 · IGCSE Science - Combined 0653

21 Which aqueous reagents give a white precipitate when added to aqueous zinc chloride? sodium barium silver hydroxide nitrate nitrate v v v 0 0O WwW > v v x v x v x v v

1 marks

Answer: C

This question in 0653/22 Feb/March 2017

22 Acidified barium nitrate solution is added to solution X. A white precipitate forms. What is X? A hydrochloric acid B limewater C potassium chloride D sulfuric acid

1 marks

Answer: D

This question in 0653/21 May/June 2017

22 Substance X is warmed with aqueous sodium hydroxide and aluminium. A gas is produced which turns damp red litmus paper blue. Which anion is present in X? A carbonate B hydroxide C nitrate D sulfate

1 marks

Answer: C

This question in 0653/22 May/June 2017

22 Solid X is warmed with dilute sodium hydroxide. A gas, which turns moist red litmus paper to blue, is given off. Dilute hydrochloric acid is added to solid X. A gas, which turns limewater cloudy, is given off. What is X? A ammonium carbonate B ammonium chloride C sodium carbonate D sodium chloride

1 marks

Answer: A

This question in 0653/22 Feb/March 2018

27 Which substance rapidly decolourises bromine? A B C D H H H H H H H H H H C H H C C H H C C C H C C C OH H H H H H H H H

1 marks

Answer: C

This question in 0653/23 Oct/Nov 2018

20 A solution is tested for the presence of cations. test result add excess aqueous ammonia green precipitate Which cation is present? A Cu2+ B Fe2+ C Fe3+ D Zn2+

1 marks

Answer: B

This question in 0653/22 Feb/March 2019

20 Which aqueous ion gives a white precipitate with aqueous sodium hydroxide and with aqueous ammonia? A Cu2+ B Fe2+ C Fe3+ D Zn2+

1 marks

Answer: D

This question in 0653/21 May/June 2019

20 Which aqueous ion gives a white precipitate with aqueous sodium hydroxide and with aqueous ammonia? A Cu2+ B Fe2+ C Fe3+ D Zn2+

1 marks

Answer: D

This question in 0653/22 May/June 2019

20 Which aqueous ion gives a white precipitate with aqueous sodium hydroxide and with aqueous ammonia? A Cu2+ B Fe2+ C Fe3+ D Zn2+

1 marks

Answer: D

This question in 0653/23 May/June 2019

19 Aqueous sodium sulfate reacts with aqueous barium chloride to make barium sulfate and sodium chloride. What is the ionic equation for this reaction? A Ba2+(aq) + SO4 2–(aq) → BaSO4(aq) B Ba2+(aq) + SO4 2–(aq) → BaSO4(s) C Na+(aq) + Cl –(aq) → NaCl (s) D Na+(aq) + Cl –(aq) → NaCl (aq)

1 marks

Answer: B

This question in 0653/22 Feb/March 2020

22 A solution of compound X produces a dark green precipitate when aqueous sodium hydroxide is added. What is X? A copper(II) chloride B copper(II) sulfate C iron(II) sulfate D iron(III) chloride

1 marks

Answer: C

This question in 0653/22 Feb/March 2020

23 Solution X is mixed with nitric acid and aqueous barium nitrate. A white precipitate is formed. Which ion is present in solution X? A carbonate B chloride C nitrate D sulfate

1 marks

Answer: D

This question in 0653/21 May/June 2020

21 Solution X is mixed with nitric acid and aqueous barium nitrate. A white precipitate is formed. Which ion is present in solution X? A carbonate B chloride C nitrate D sulfate

1 marks

Answer: D

This question in 0653/22 May/June 2020

22 Acid X reacts with metal Y. A colourless gas is given off and a pale green solution is produced. Two tests are carried out on the solution. test reagent(s) added result 1 aqueous silver nitrate and nitric acid white precipitate 2 aqueous sodium hydroxide green precipitate What are acid X and metal Y? acid metal A hydrochloric iron B hydrochloric zinc C sulfuric iron D sulfuric zinc

1 marks

Answer: A

This question in 0653/21 Oct/Nov 2020

22 Acid X reacts with metal Y. A colourless gas is given off and a pale green solution is produced. Two tests are carried out on the solution. test reagent(s) added result 1 aqueous silver nitrate and nitric acid white precipitate 2 aqueous sodium hydroxide green precipitate What are acid X and metal Y? acid metal A hydrochloric iron B hydrochloric zinc C sulfuric iron D sulfuric zinc

1 marks

Answer: A

This question in 0653/22 Oct/Nov 2020

23 Acid X reacts with metal Y. A colourless gas is given off and a pale green solution is produced. Two tests are carried out on the solution. test reagent(s) added result 1 aqueous silver nitrate and nitric acid white precipitate 2 aqueous sodium hydroxide green precipitate What are acid X and metal Y? acid metal A hydrochloric iron B hydrochloric zinc C sulfuric iron D sulfuric zinc

1 marks

Answer: A

This question in 0653/23 Oct/Nov 2020

22 A mixture of ammonium carbonate and ammonium chloride is heated with aqueous sodium hydroxide. Which gas is produced? A ammonia B carbon dioxide C chlorine D hydrogen chloride

1 marks

Answer: A

This question in 0653/22 Feb/March 2021

23 The diagram shows what happens when damp red litmus paper is placed into two different gases, X and Y. gas gas X Y red litmus paper red litmus paper turns blue turns white What are gases X and Y? X Y A ammonia carbon dioxide B ammonia chlorine C chlorine ammonia D chlorine carbon dioxide

1 marks

Answer: B

This question in 0653/22 Feb/March 2021

25 Which change shows the presence of water? A Anhydrous copper(II) sulfate turns white. B Anhydrous copper(II) sulfate turns pink. C Cobalt(II) chloride paper turns pink. D Cobalt(II) chloride paper turns blue.

1 marks

Answer: C

This question in 0653/22 Feb/March 2021

22 Which two substances form a white precipitate when they are mixed? A barium chloride and hydrochloric acid B barium chloride and nitric acid C silver nitrate and hydrochloric acid D silver nitrate and nitric acid

1 marks

Answer: C

This question in 0653/21 May/June 2021

22 Which two substances form a white precipitate when they are mixed? A barium chloride and hydrochloric acid B barium chloride and nitric acid C silver nitrate and hydrochloric acid D silver nitrate and nitric acid

1 marks

Answer: C

This question in 0653/22 May/June 2021

22 Which two substances form a white precipitate when they are mixed? A barium chloride and hydrochloric acid B barium chloride and nitric acid C silver nitrate and hydrochloric acid D silver nitrate and nitric acid

1 marks

Answer: C

This question in 0653/23 May/June 2021

20 A piece of damp blue litmus paper is placed in a gas. The litmus paper turns red and then turns white. What is the gas? A carbon dioxide B chlorine C hydrogen D oxygen

1 marks

Answer: B

This question in 0653/21 Oct/Nov 2021

20 A piece of damp blue litmus paper is placed in a gas. The litmus paper turns red and then turns white. What is the gas? A carbon dioxide B chlorine C hydrogen D oxygen

1 marks

Answer: B

This question in 0653/22 Oct/Nov 2021

26 Magnesium carbonate reacts with dilute hydrochloric acid. Calcium carbonate decomposes when heated. Which gas is produced in both reactions? A carbon dioxide B carbon monoxide C chlorine D hydrogen

1 marks

Answer: A

This question in 0653/22 Oct/Nov 2021

20 A piece of damp blue litmus paper is placed in a gas. The litmus paper turns red and then turns white. What is the gas? A carbon dioxide B chlorine C hydrogen D oxygen

1 marks

Answer: B

This question in 0653/23 Oct/Nov 2021

21 The results of two tests on substance Q are shown. test result add dilute hydrochloric acid bubbles of colourless gas, R, to solid Q which turns limewater milky add aqueous sodium hydroxide green precipitate to a solution of Q Which cation is present in Q and what is gas R? cation present in Q gas R A iron(II) carbon dioxide B iron(II) chlorine C iron(III) carbon dioxide D iron(III) chlorine

1 marks

Answer: A

This question in 0653/21 May/June 2022

27 Which substance rapidly turns aqueous bromine from orange to colourless? A ethane B ethanol C ethene D methane

1 marks

Answer: C

This question in 0653/21 May/June 2022

20 The results of two tests on substance Q are shown. test result add dilute hydrochloric acid bubbles of colourless gas, R, to solid Q which turns limewater milky add aqueous sodium hydroxide green precipitate to a solution of Q Which cation is present in Q and what is gas R? cation present in Q gas R A iron(II) carbon dioxide B iron(II) chlorine C iron(III) carbon dioxide D iron(III) chlorine

1 marks

Answer: A

This question in 0653/22 May/June 2022

21 The results of two tests on substance Q are shown. test result add dilute hydrochloric acid bubbles of colourless gas, R, to solid Q which turns limewater milky add aqueous sodium hydroxide green precipitate to a solution of Q Which cation is present in Q and what is gas R? cation present in Q gas R A iron(II) carbon dioxide B iron(II) chlorine C iron(III) carbon dioxide D iron(III) chlorine

1 marks

Answer: A

This question in 0653/23 May/June 2022

20 Which pair of gases can be identified using damp litmus paper and limewater? A carbon dioxide and hydrogen B chlorine and carbon dioxide C chlorine and oxygen D hydrogen and chlorine

1 marks

Answer: B

This question in 0653/21 Oct/Nov 2022

20 Which pair of gases can be identified using damp litmus paper and limewater? A carbon dioxide and hydrogen B chlorine and carbon dioxide C chlorine and oxygen D hydrogen and chlorine

1 marks

Answer: B

This question in 0653/22 Oct/Nov 2022

24 A few drops of liquid X are added to a white solid. The white solid turns blue. Which statements are correct? 1 The white solid is copper(II) sulfate. 2 Liquid X is water. 3 Liquid X turns blue cobalt(II) chloride paper pink. A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3

1 marks

Answer: D

This question in 0653/22 Oct/Nov 2022

25 Which colour change is seen when water is added to anhydrous cobalt(II) chloride? A white to blue B pink to blue C blue to white D blue to pink

1 marks

Answer: D

This question in 0653/22 Feb/March 2023

22 The results of two tests on a solution of substance R are shown. test result aqueous sodium red-brown precipitate formed, hydroxide added insoluble in excess dilute nitric acid added followed by aqueous white precipitate formed silver nitrate added What is R? A iron(II) carbonate B iron(III) carbonate C iron(II) chloride D iron(III) chloride

1 marks

Answer: D

This question in 0653/21 May/June 2023

22 The results of two tests on solid P are shown. test result 1 add aqueous gas given off that turns sodium hydroxide to solid moist red litmus paper blue 2 dissolve solid in water, white precipitate formed add dilute aqueous silver nitrate What is P? A aluminium carbonate B aluminium sulfate C ammonium chloride D ammonium nitrate

1 marks

Answer: C

This question in 0653/22 May/June 2023

22 The results of two tests on a white solid are shown. test result 1 add aqueous sodium hydroxide white precipitate formed 2 add dilute hydrochloric acid colourless gas formed What is the white solid? A iron(II) carbonate B iron(II) chloride C zinc carbonate D zinc chloride

1 marks

Answer: C

This question in 0653/23 May/June 2023

8 Which chemical is used to test for carbon dioxide in expired air? A Benedict’s solution B distilled water C iodine solution D limewater

1 marks

Answer: D

This question in 0653/21 Oct/Nov 2023

22 Acid X reacts with metal Y. A colourless gas is given off and a pale green solution is produced. Two tests are carried out on the solution. test reagents added result 1 aqueous silver nitrate and dilute nitric acid white precipitate 2 aqueous sodium hydroxide green precipitate What are acid X and metal Y? acid X metal Y A hydrochloric iron B hydrochloric zinc C sulfuric iron D sulfuric zinc

1 marks

Answer: A

This question in 0653/21 Oct/Nov 2023

8 A student is investigating the differences in composition of samples of inspired and expired air. What can he use to test for carbon dioxide? A biuret solution B limewater C ethanol D iodine solution

1 marks

Answer: B

This question in 0653/22 Oct/Nov 2023

9 A student sets up the experiment shown. oil layer limewater living animal Which statement is correct? A The limewater stays colourless because decomposition is occurring. B The limewater stays colourless because photosynthesis is occurring. C The limewater turns milky because aerobic respiration is occurring. D The limewater turns milky because photosynthesis is occurring.

1 marks

Answer: C

This question in 0653/22 Oct/Nov 2023

21 Which test is used to identify ammonia? A A glowing splint relights. B Damp blue litmus paper is bleached. C Damp red litmus paper turns blue. D Limewater turns milky.

1 marks

Answer: C

This question in 0653/22 Oct/Nov 2023

17 Aqueous lead nitrate and aqueous sodium chloride react to form aqueous sodium nitrate and solid lead chloride. What is the ionic equation for this reaction? A Pb2+(aq) + Cl 2–(aq)  PbCl (s) B Pb2+(aq) + 2Cl –(aq)  PbCl 2(s) C Na+(aq) + NO3 –(aq)  NaNO3(aq) D Na+(aq) + 2NO3 –(aq)  Na(NO3)2(aq)

1 marks

Answer: B

This question in 0653/23 Oct/Nov 2023

21 Substance X is warmed with aqueous sodium hydroxide and aluminium. A gas is produced which turns damp red litmus paper blue. Which anion is present in X? A carbonate B hydroxide C nitrate D sulfate

1 marks

Answer: C

This question in 0653/23 Oct/Nov 2023

21 Which aqueous substances form a white precipitate when they are mixed? A barium chloride and hydrochloric acid B barium chloride and nitric acid C silver nitrate and nitric acid D silver nitrate and hydrochloric acid

1 marks

Answer: D

This question in 0653/21 May/June 2024

23 Magnesium carbonate reacts with dilute sulfuric acid. A gas is produced. What is the test for this gas? A It bleaches damp litmus paper. B It ‘pops’ with a lighted splint. C It relights a glowing splint. D It turns limewater milky.

1 marks

Answer: D

This question in 0653/22 May/June 2024

23 What is the test for nitrate ions? A add aqueous sodium hydroxide, then aluminum foil, and warm, test any gas formed with damp red litmus paper B acidify, then add aqueous barium chloride C acidify, then add aqueous silver nitrate D add dilute hydrochloric acid, test any gas produced with limewater

1 marks

Answer: A

This question in 0653/23 May/June 2024

22 A piece of damp blue litmus paper is placed in a gas. The litmus paper turns red and then turns white. What is the gas? A chlorine B hydrogen C carbon dioxide D oxygen

1 marks

Answer: A

This question in 0653/21 Oct/Nov 2024

25 Two different bottles each contain a colourless liquid. One bottle contains an alkene and the other contains water. Three different tests are listed. 1 addition of pink cobalt(II) chloride 2 addition of brown aqueous bromine 3 addition of white copper(II) sulfate Which tests can be used to positively identify the bottle that contains water? A 1 only B 2 only C 1 and 3 D 2 and 3

1 marks

Answer: C

This question in 0653/23 Oct/Nov 2024

23 Which statement describes a chemical test for water? A Water boils at 100 °C. B Water turns blue cobalt(II) chloride pink. C Water turns blue copper(II) sulfate white. D Water turns red litmus paper blue.

1 marks

Answer: B

This question in 0653/22 Feb/March 2025

25 Which tests are used to identify the ions in aqueous iron(II) sulfate? 1 add acidified aqueous silver nitrate 2 add acidified aqueous barium nitrate 3 add aqueous sodium hydroxide A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: D

This question in 0653/22 Feb/March 2025