Identification of ions and gases — Paper 2 · IGCSE Sciences - Co-ordinated (9-1) 0973

10 An experiment using germinating seeds is set up as shown, and left at room temperature for 12 hours. to pump solution P solution Q germinating damp peas cotton wool The pump is then switched on and air is drawn through the apparatus for 2 minutes. Which row identifies solutions P and Q and the results obtained? solution P solution P results solution Q solution Q results A ethanol remains colourless ethanol turns milky B ethanol turns milky limewater remains colourless C limewater remains colourless limewater turns milky D limewater turns milky ethanol remains colourless

1 marks

Answer: C

This question in 0973/21 May/June 2020

20 Which chemical test does not produce a precipitate? A carbon dioxide and limewater B carbonate ions and dilute hydrochloric acid C chloride ions and aqueous silver nitrate D copper(II) ions and aqueous sodium hydroxide

1 marks

Answer: B

This question in 0973/21 Oct/Nov 2020

19 Which row shows the flame test colours for lithium and sodium? lithium sodium A lilac blue-green B lilac yellow C red blue-green D red yellow

1 marks

Answer: D

This question in 0973/21 May/June 2022

19 When aqueous potassium hydroxide is warmed with ammonium chloride, a gas is given off. Which test result identifies the gas? A It bleaches pH paper. B It turns anhydrous cobalt(II) chloride blue. C It turns universal indicator red. D It turns red litmus blue.

1 marks

Answer: D

This question in 0973/22 May/June 2022

17 Aqueous potassium bromide reacts with aqueous silver nitrate to produce a cream precipitate. What is the ionic equation for this reaction? A Ag+(aq) + Br–(aq) → AgBr(s) B Ag2+(aq) + 2Br–(aq) → AgBr2(s) C K+(aq) + NO3 –(aq) → KNO3(s) D 2K+(aq) + NO3 2–(aq) → K2NO3(s)

1 marks

This question in 0973/22 May/June 2023

21 Substance X is mixed with aqueous sodium hydroxide. A green precipitate is produced. Which metal ion is present in X? A Cu2+ B Fe2+ C Fe3+ D Zn2+

1 marks

Answer: B

This question in 0973/21 Oct/Nov 2023

22 Which metal is used in the test for nitrate ions? A aluminium B copper C magnesium D tin

1 marks

Answer: A

This question in 0973/21 May/June 2024

23 Ammonia is displaced from its salts by reaction with substance Z. Which row identifies substance Z and the test for ammonia? substance Z test for ammonia A hydrochloric acid turns red litmus blue B hydrochloric acid turns blue litmus red C sodium hydroxide turns red litmus blue D sodium hydroxide turns blue litmus red

1 marks

Answer: C

This question in 0973/22 May/June 2024

8 A student breathed gently in and out of the mouthpiece of the apparatus shown. mouthpiece tube limewater P Q What were the results after 10 breaths? P Q A colourless colourless B colourless milky C milky colourless D milky milky

1 marks

Answer: B

This question in 0973/21 Oct/Nov 2024

25 In a test for water, water turns anhydrous copper(II) … 1 … from … 2 … to … 3 … . Which words complete gaps 1, 2 and 3? 1 2 3 A chloride blue white B chloride white blue C sulfate blue white D sulfate white blue

1 marks

Answer: D

This question in 0973/21 Oct/Nov 2024

27 The results of tests on aqueous G are listed. 1 Adding aqueous sodium hydroxide produces a white precipitate that is insoluble in excess. 2 Adding acidified aqueous silver nitrate produces a cream precipitate. What is G? A calcium bromide B calcium chloride C zinc bromide D zinc chloride

1 marks

Answer: A

This question in 0973/21 Oct/Nov 2025