Water — Paper 1 · IGCSE Chemistry (9-1) 0971

29 Which statements about water are correct? 1 Household water contains dissolved salts. 2 Water for household use is filtered to remove soluble impurities. 3 Water is treated with chlorine to kill bacteria. 4 Water is used in industry for cooling. A 1, 2, 3 and 4 B 1, 2 and 3 only C 1, 3 and 4 only D 2, 3 and 4 only

1 marks

Answer: C

This question in 0971/11 May/June 2018

28 Water can be treated by filtration then chlorination. Which uses do not need water of this quality? 1 water for cooling in industry 2 water for washing clothes 3 water for drinking A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: B

This question in 0971/11 May/June 2019

28 River water contains soluble impurities, insoluble impurities and bacteria. River water is made safe to drink by filtration and chlorination. Which statement is correct? A Filtration removes bacteria and insoluble impurities, and chlorination removes soluble impurities. B Filtration removes insoluble impurities, and chlorination kills the bacteria. C Filtration removes soluble and insoluble impurities, and chlorination kills the bacteria. D Filtration removes soluble impurities and bacteria, and chlorination removes insoluble impurities.

1 marks

Answer: B

This question in 0971/12 Oct/Nov 2019

28 Which statement shows that a liquid is pure water? A It boils at 100 °C. B It has a pH value of 7. C It turns blue cobalt(II) chloride pink. D It turns white copper(II) sulfate blue.

1 marks

Answer: A

This question in 0971/11 May/June 2020

3 Which process is used to produce drinking water from sea water? A crystallisation B distillation C filtration D chlorination

1 marks

Answer: B

This question in 0971/12 May/June 2020

28 Which statement about pure water is not correct? A It condenses at 100 °C. B It freezes at 0 °C. C It turns cobalt(II) chloride paper blue. D It turns anhydrous copper(II) sulfate blue.

1 marks

Answer: C

This question in 0971/12 May/June 2020

32 Water is purified using several processes. Four of the processes are listed. 1 Chlorine is added to water to kill any bacteria. 2 Water is passed through coarse gravel to remove large pieces of dirt. 3 Water is passed through wire screens to remove large twigs. 4 Water is passed through fine sand to remove small particles. In which order are the processes carried out? A 1  2  3  4 B 2  1  4  3 C 3  2  4  1 D 4  3  2  1

1 marks

Answer: C

This question in 0971/12 Oct/Nov 2020

28 The diagrams show some uses of water in the home. 1 2 3 For which uses is it important for the water to have been treated? A 1 only B 2 only C 3 only D 1, 2 and 3

1 marks

Answer: A

This question in 0971/12 Oct/Nov 2021

28 The diagram shows a stage in the purification of dirty water. dirty water sand pot with holes fine gravel in bottom coarse gravel Which process does this apparatus show? A chlorination B condensation C distillation D filtration

1 marks

Answer: D

This question in 0971/12 Oct/Nov 2022

29 Several processes are used to treat domestic water. Which row identifies a reason for the given process? process reason A chlorination removes impurities B filtration removes insoluble solids C sedimentation removes soluble solids D use of carbon kills bacteria

1 marks

Answer: B

This question in 0971/11 May/June 2023

39 Which process is used to produce drinking water from sea water? A crystallisation B distillation C filtration D chlorination

1 marks

Answer: B

This question in 0971/11 May/June 2023

31 The flow chart shows stages in the treatment of river water to produce drinking water. river sedimentation stage stage drinking water tank J K water What occurs at stages J and K? J K A distillation chlorination B distillation filtration C filtration chlorination D filtration distillation

1 marks

Answer: C

This question in 0971/12 Oct/Nov 2023

30 Which statement shows that a liquid is pure water? A It boils at 100°C. B It has a pH value of 7. C It turns blue cobalt(II) chloride pink. D It turns white copper(II) sulfate blue.

1 marks

Answer: A

This question in 0971/12 May/June 2024

38 Sea water contains dissolved sodium chloride. Which method is used to obtain pure water from sea water? A chromatography B distillation C evaporation D filtration Which piece of apparatus is used to measure exactly 21.4cm3 of water?

1 marks

Answer: B

This question in 0971/12 May/June 2024

32 Which substances in water from natural sources are beneficial to aquatic animals? 1 metal compounds 2 plastics 3 phosphates 4 dissolved oxygen A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

1 marks

Answer: B

This question in 0971/12 Oct/Nov 2024

31 Which substances can be used to detect the presence of water? 1 anhydrous cobalt(II) chloride 2 anhydrous copper(II) sulfate 3 litmus 4 methyl orange A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

1 marks

Answer: A

This question in 0971/11 May/June 2025

32 Some substances found in water from natural sources are potentially harmful. Which substance contains microbes that cause disease? A metal compounds B nitrates C phosphates D sewage

1 marks

Answer: D

This question in 0971/12 Oct/Nov 2025