Separation and purification — Paper 1 · IGCSE Sciences - Co-ordinated (9-1) 0973

20 Hydrochloric acid and sodium hydroxide neutralise each other to form water and sodium chloride. Which method is used to make the solution crystallise? A chromatography B evaporation C filtration D fractional distillation

1 marks

Answer: B

This question in 0973/11 May/June 2019

20 Copper sulfate is made by adding an excess of copper carbonate to dilute sulfuric acid and stirring. The excess solid is removed. Most of the water is then removed. The solution is left for solid copper sulfate to form. In which order is apparatus used? A Bunsen burner, tripod and flask → filter funnel → crystallising dish B Bunsen burner, tripod and flask → crystallising dish → filter funnel C filter funnel → crystallising dish → Bunsen burner, tripod and flask D filter funnel → Bunsen burner, tripod and flask → crystallising dish

1 marks

Answer: D

This question in 0973/11 May/June 2020

15 A sample of water is contaminated with insoluble chalk and a soluble salt. Which two processes are used to separate the water from the chalk and salt? A distillation and chromatography B distillation and crystallisation C filtration and chromatography D filtration and crystallisation

1 marks

Answer: D

This question in 0973/11 Oct/Nov 2020

15 Pure substance X has a melting point of 110 C. The melting point ranges of four impure samples of substance X are measured. What is the melting point range of the most impure sample of substance X? melting point / C A 81–85 B 86–92 C 98–99 D 102–110

1 marks

Answer: A

This question in 0973/11 May/June 2021

15 Which method can be used to separate graphite from dilute nitric acid? A chromatography B crystallisation C distillation D filtration

1 marks

Answer: D

This question in 0973/12 May/June 2021

23 In order to make water from reservoirs fit to drink … 1 … is used to kill bacteria. Water in a condenser is used during distillation as a … 2 … . When water is used to make ethanol from ethene it is acting as a … 3 … . Which words correctly complete gaps 1, 2 and 3? 1 2 3 A chlorination coolant reactant B chlorination solvent solvent C filtration coolant reactant D filtration solvent solvent

1 marks

Answer: A

This question in 0973/12 May/June 2021

26 Which property allows petroleum to be separated by fractional distillation? A boiling point B colour C density D melting point

1 marks

Answer: A

This question in 0973/12 May/June 2021

14 A mixture contains solid P dissolved in liquid Q. Which process is used to obtain a pure sample of liquid Q from this mixture? A crystallisation B distillation C evaporation D paper chromatography

1 marks

Answer: B

This question in 0973/11 May/June 2022

14 An aqueous salt solution contains an insoluble impurity. Which processes are used to obtain pure salt crystals? A distillation then crystallisation B distillation then chromatography C filtration then crystallisation D filtration then chromatography

1 marks

Answer: C

This question in 0973/11 May/June 2023

21 Magnesium chloride is prepared by reacting an excess of insoluble magnesium oxide with dilute hydrochloric acid. Which processes are used to obtain pure crystals of magnesium chloride from the reaction mixture? 1 distillation 2 evaporation 3 filtration A 1 followed by 2 B 3 followed by 2 C 3 followed by 1 D 1 followed by 3, followed by 2

1 marks

Answer: B

This question in 0973/11 May/June 2023

26 Petroleum is separated into fractions by fractional distillation. Information about uses of some fractions and positions in the fractionating column where they are collected is shown. fraction use position 1 gasoline making roads below refinery gas 2 bitumen petrol for car engines bottom of column 3 naphtha making chemicals below gasoline 4 refinery gas heating and cooking top of column Which rows are correct? A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

1 marks

Answer: D

This question in 0973/11 May/June 2023

14 Hexane and octane are liquid hydrocarbons that mix together. Which apparatus is used to separate a mixture of these two liquids? A B C D xxxxxxxxx heat xxxxxxxxx heat

1 marks

Answer: D

This question in 0973/12 May/June 2023

24 Which property allows petroleum to be separated by fractional distillation? A boiling point B colour C density D melting point

1 marks

Answer: A

This question in 0973/12 May/June 2025

27 When aqueous copper(II) sulfate reacts with aqueous sodium hydroxide, a blue precipitate forms. Which method is used to remove the precipitate from the reaction mixture? A chromatography B distillation C filtration D crystallisation

1 marks

Answer: C

This question in 0973/12 May/June 2025

25 Which process is used to obtain gasoline from petroleum? A crystallisation B chromatography C filtration D fractional distillation

1 marks

Answer: D

This question in 0973/11 Oct/Nov 2025