Separation and purification — Paper 2 · IGCSE Chemistry (9-1) 0971

31 Which process is used to separate nitrogen and oxygen from air? A chromatography B evaporation C filtration D fractional distillation

1 marks

Answer: D

This question in 0971/22 Oct/Nov 2019

5 Different methods of separation rely on substances having different properties. Which property does distillation make use of? A boiling point B colour C particle size D solubility in different solvents

1 marks

Answer: A

This question in 0971/22 Oct/Nov 2020

2 A mixture is separated using the apparatus shown. mixture funnel filter paper What is the mixture? A aqueous copper(II) sulfate and aqueous sodium chloride B aqueous copper(II) sulfate and copper C copper and sulfur D ethanol and ethanoic acid

1 marks

Answer: B

This question in 0971/21 May/June 2021

19 Copper(II) sulfate is prepared by adding excess copper(II) oxide to warm dilute sulfuric acid. Which purification methods are used to obtain pure solid copper(II) sulfate from the reaction mixture? 1 crystallisation 2 filtration 3 chromatography 4 distillation A 1 and 4 B 1 and 2 C 2 and 3 D 3 and 4

1 marks

Answer: B

This question in 0971/21 May/June 2021

38 The flow chart shows how petroleum may be turned into a plastic. process process process 1 saturated 2 unsaturated 3 petroleum plastic hydrocarbon hydrocarbon What are processes 1, 2 and 3? process 1 process 2 process 3 A cracking fractional distillation polymerisation B cracking polymerisation fractional distillation C fractional distillation cracking polymerisation D fractional distillation polymerisation cracking

1 marks

Answer: C

This question in 0971/22 May/June 2021

3 A student separates sugar from pieces of broken glass by dissolving the sugar in water and filtering off the broken glass. filtrate What is the filtrate? A broken glass only B broken glass and sugar solution C pure water D sugar solution

1 marks

Answer: D

This question in 0971/22 Oct/Nov 2021

4 Which substance should be pure for the intended use? A a drug for curing disease B limestone for iron extraction C petroleum for fractional distillation D water for washing a car

1 marks

Answer: A

This question in 0971/21 May/June 2022

19 An acid is neutralised by adding an excess of an insoluble solid base. A soluble salt is formed. How is the pure salt obtained from the reaction mixture? A crystallisation  evaporation  filtration B evaporation  crystallisation  filtration C filtration  crystallisation  evaporation D filtration  evaporation  crystallisation

1 marks

Answer: D

This question in 0971/21 May/June 2022

29 The diagram shows the uses and treatment processes of muddy river water. process 1 process 2 muddy river water clear river water disinfected water use 1 use 2 Which row identifies uses 1 and 2 and processes 1 and 2? use 1 use 2 process 1 process 2 A drinking watering crops chlorination filtration B drinking watering crops filtration chlorination C watering crops drinking chlorination filtration D watering crops drinking filtration chlorination

1 marks

Answer: D

This question in 0971/21 May/June 2022

19 An acid is neutralised by adding an excess of an insoluble solid base. A soluble salt is formed. How is the pure salt obtained from the reaction mixture? A crystallisation  evaporation  filtration B evaporation  crystallisation  filtration C filtration  crystallisation  evaporation D filtration  evaporation  crystallisation

1 marks

Answer: D

This question in 0971/22 May/June 2022

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 0971/22 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 0971/21 May/June 2023

34 The fractional distillation of petroleum is shown. Which fraction contains hydrocarbons with the longest chain length? fuel gas A B C D petroleum bitumen

1 marks

Answer: D

This question in 0971/21 May/June 2023

18 Copper(II) carbonate is formed when aqueous sodium carbonate is added to aqueous copper(II) nitrate. The ionic equation for the reaction is shown. CO3 2–(aq) + Cu2+(aq) → CuCO3(s) How is pure copper(II) carbonate obtained from the reaction mixture? A evaporate → filter → dry B evaporate → wash → crystallise C filter → evaporate → crystallise D filter → wash → dry

1 marks

Answer: D

This question in 0971/22 May/June 2023

38 Rock salt is a mixture of salt and sand. The method used to separate the sand from the salt is listed. step 1 Crush the rock salt, add to warm water and stir. step 2 Pour the mixture through a filter paper held in a funnel. step 3 Evaporate the water to crystallise the salt. Which statement about the method is correct? A The filtrate in step 2 is pure water. B The residue in step 2 is pure crystals of salt. C The solute is salt. D The solvent is a mixture of salt and water.

1 marks

Answer: C

This question in 0971/22 May/June 2023

30 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 0971/22 Oct/Nov 2023

30 Which statement is correct? A Bitumen is used as a fuel for ships. B Coal, natural gas and oxygen are all fuels. C Hydrogen is the main constituent of natural gas. D Petroleum is separated into useful substances by fractional distillation.

1 marks

Answer: D

This question in 0971/22 Oct/Nov 2024

39 Pure solid copper(II) nitrate can be obtained from a mixture of copper(II) nitrate and copper powder. Three stages in the method are listed. X add water and stir Y crystallise Z filter After the three stages, the copper(II) nitrate is washed and dried. What is the correct order of stages X, Y and Z to obtain pure solid copper(II) nitrate from the mixture? A X  Y  Z B X  Z  Y C Y  X  Z D Z  X  Y

1 marks

Answer: B

This question in 0971/22 Oct/Nov 2024

39 A mixture containing an aqueous salt and an insoluble salt is filtered. X Y Which row describes X and Y? X Y A solute pure water B solute filtrate C residue pure water D residue filtrate

1 marks

Answer: D

This question in 0971/22 May/June 2025