Water — Paper 2 · IGCSE Sciences - Co-ordinated (Double) 0654

24 Other than hydrogen and oxygen, which substance provides only one of the essential elements for plant growth? A K3PO4 B KNO3 C (NH4)3PO4 D NH4NO3

1 marks

Answer: D

This question in 0654/21 May/June 2021

24 Other than hydrogen and oxygen, which substance provides only one of the essential elements for plant growth? A K3PO4 B KNO3 C (NH4)3PO4 D NH4NO3

1 marks

Answer: D

This question in 0654/22 May/June 2021

25 Concentrated sulfuric acid is made by the Contact process. During this process, sulfur trioxide is added to concentrated sulfuric acid rather than to water. Which statement about the reaction of sulfur trioxide with water is correct? A It produces an acid mist. B It is endothermic. C It produces oleum, H2S2O7. D The rate of reaction is low.

1 marks

Answer: A

This question in 0654/22 May/June 2021

24 Other than hydrogen and oxygen, which substance provides only one of the essential elements for plant growth? A K3PO4 B KNO3 C (NH4)3PO4 D NH4NO3

1 marks

Answer: D

This question in 0654/23 May/June 2021

26 What is not a use of limestone? A manufacture of calcium oxide B neutralising industrial waste products C purifying water D treating acidic soil

1 marks

Answer: C

This question in 0654/22 Oct/Nov 2022

26 What is not a use of limestone? A manufacture of calcium oxide B neutralising industrial waste products C purifying water D treating acidic soil

1 marks

Answer: C

This question in 0654/23 Oct/Nov 2022

25 Which row explains the use of chlorination and filtration in the treatment of the water supply? chlorination filtration A to neutralise acids to remove dissolved substances B to neutralise bases to remove insoluble substances C to kill bacteria to remove dissolved substances D to kill bacteria to remove insoluble substances

1 marks

Answer: D

This question in 0654/22 Feb/March 2024

24 Copper(II) sulfate and cobalt(II) chloride are used to test for water. Which rows show the colour changes for these two substances? substance initial colour final colour 1 cobalt(II) chloride blue pink 2 cobalt(II) chloride pink blue 3 copper(II) sulfate blue white 4 copper(II) sulfate white blue A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

1 marks

Answer: B

This question in 0654/23 May/June 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 0654/21 Oct/Nov 2024

25 Which three elements do most fertilisers contain? A Na, C, P B Na, P, K C K, C, N D K, P, N

1 marks

Answer: D

This question in 0654/23 Oct/Nov 2024

23 Which row shows the conditions that each turn a sample of white copper(II) sulfate blue? add water heat \ \ x x SO

1 marks

Answer: D

This question in 0654/23 May/June 2025

24 Which two processes are used to treat the domestic water supply? A chlorination and evaporation B chlorination and filtration C crystallisation and evaporation D crystallisation and filtration

1 marks

Answer: B

This question in 0654/23 May/June 2025

22 Which row describes the colour changes when water is added to anhydrous copper(II) sulfate and to anhydrous cobalt(II) chloride? copper(II) sulfate cobalt(II) chloride A blue  white blue  pink B blue  white pink  blue C white  blue blue  pink D white  blue pink  blue

1 marks

Answer: C

This question in 0654/23 Oct/Nov 2025

23 Which row explains why filtration and chlorination are used in the treatment of the domestic water supply? filtration chlorination A to remove soluble substances to kill microbes B to remove insoluble substances to kill microbes C to kill microbes to remove insoluble substances D to remove insoluble substances to remove soluble substances

1 marks

Answer: B

This question in 0654/23 Oct/Nov 2025