The characteristic properties of acids and bases — Paper 2 · IGCSE Sciences - Co-ordinated (9-1) 0973

18 An acid is added to an alkali until the final solution is just neutral. The reaction is exothermic. Which graph shows how the temperature changes as the acid is being added to the alkali? A B start start temperature temperature 0 volume of acid 0 volume of acid C D start start temperature temperature 0 volume of acid 0 volume of acid

1 marks

Answer: C

This question in 0973/21 May/June 2019

19 Some properties of four oxides, W, X, Y and Z, are shown. property W X Y Z reaction with acids yes no no yes reaction with alkalis no yes no yes Which row classifies these oxides? W X Y Z A acidic basic neutral amphoteric B acidic basic amphoteric neutral C basic acidic amphoteric neutral D basic acidic neutral amphoteric

1 marks

Answer: D

This question in 0973/21 May/June 2019

19 An acid is added to an alkali until the final solution is just neutral. The reaction is exothermic. Which graph shows how the temperature changes as the acid is being added to the alkali? A B start start temperature temperature 0 volume of acid 0 volume of acid C D start start temperature temperature 0 volume of acid 0 volume of acid

1 marks

Answer: C

This question in 0973/22 May/June 2019

21 The pH values of four liquids are 1, 4, 7 and 13. The four liquids are distilled water, nitric acid, potassium hydroxide and vinegar. Which row shows the pH values of the liquids? potassium distilled water nitric acid vinegar hydroxide A 4 7 13 1 B 4 13 7 1 C 7 1 4 13 D 7 1 13 4

1 marks

Answer: D

This question in 0973/21 Oct/Nov 2019

20 X is an oxide. When solid X is added to dilute hydrochloric acid, the pH of the solution increases. When solid X is added to aqueous sodium hydroxide, the pH of the solution decreases. Which type of oxide is X? A acidic B amphoteric C basic D neutral

1 marks

Answer: B

This question in 0973/21 May/June 2020

25 Limestone is converted to lime in process 1. Limestone is used to treat industrial waste in process 2. What are processes 1 and 2? process 1 process 2 A decomposition dissolving B decomposition neutralisation C oxidation dissolving D oxidation neutralisation

1 marks

Answer: B

This question in 0973/21 May/June 2020

25 Which statement about calcium carbonate is not correct? A It forms carbon dioxide when it is heated. B It forms carbon dioxide when it is mixed with dilute hydrochloric acid. C It is formed by heating lime. D It neutralises acids.

1 marks

Answer: C

This question in 0973/22 May/June 2020

20 What reacts with ammonia gas? hydrochloric sodium acid hydroxide A Jv J B Jv x Cc x v D x x key Jv = reacts X = does not react

1 marks

Answer: B

This question in 0973/21 May/June 2021

20 What reacts with ammonia gas? hydrochloric sodium acid hydroxide Jv Jv Jv x x Jv x x key Jv = reacts X = does not react

1 marks

Answer: B

This question in 0973/22 May/June 2021

25 Calcium carbonate (limestone) is a base. Which uses of limestone depend on it acting as a base? 1 making lime 2 neutralising acid waste 3 stone buildings 4 treatment of soil A 1 and 2 B 2 and 3 C 2 and 4 D 3 and 4

1 marks

Answer: C

This question in 0973/21 Oct/Nov 2021

25 Why do farmers add limestone to soil? A It acts as a fertiliser. B It adds nitrogen to the soil. C It decreases the pH of the soil. D It increases the pH of the soil.

1 marks

Answer: D

This question in 0973/21 May/June 2022

25 Why do farmers add limestone to soil? A It acts as a fertiliser. B It adds nitrogen to the soil. C It decreases the pH of the soil. D It increases the pH of the soil.

1 marks

Answer: D

This question in 0973/22 May/June 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 0973/21 Oct/Nov 2022

20 Which statements about neutralisation are correct? 1 Acids and bases produce water when they neutralise each other. 2 During neutralisation, bases transfer protons to acids. 3 Neutral solutions turn universal indicator green. 4 During neutralisation, acids transfer hydroxide ions to bases. A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

1 marks

Answer: A

This question in 0973/21 May/June 2023

25 Which statements about limestone are correct? 1 It contains calcium oxide. 2 It is used to manufacture lime. 3 It neutralises acidic industrial waste products. 4 It neutralises alkaline soil. A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

1 marks

Answer: C

This question in 0973/22 May/June 2023

20 Universal indicator solution is added to test-tubes W, X and Y. W X Y dilute aqueous aqueous hydrochloric acid sodium hydroxide sodium chloride What are the colours of the universal indicator? in test-tube W in test-tube X in test-tube Y A green red purple B purple green red C red green purple D red purple green

1 marks

Answer: D

This question in 0973/22 May/June 2024

21 Which statement describes what happens when calcium carbonate is added to the blast furnace during the extraction of iron? A It burns and provides heat. B It decomposes and calcium oxide is a product. C It reacts with silicon dioxide. D It reduces the iron ore.

1 marks

Answer: B

This question in 0973/22 May/June 2025