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

25 Which two statements about calcium carbonate are correct? 1 It neutralises acidic industrial waste. 2 It lowers the pH of soil. 3 It undergoes thermal decomposition to calcium hydroxide. 4 It reacts with dilute hydrochloric acid to form carbon dioxide. A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

1 marks

Answer: B

This question in 0973/11 May/June 2019

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 0973/11 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 0973/12 May/June 2020

23 Magnesium is tested as shown. magnesium dilute hydrochloric lamp acid magnesium test 1 test 2 Which row shows the results of the tests? test 1 test 2 A bubbles lamp does not light B bubbles lamp lights C no bubbles lamp does not light D no bubbles lamp lights

1 marks

Answer: B

This question in 0973/11 Oct/Nov 2020

25 Which process does not produce carbon dioxide? A acid reacting with a metal B acid reacting with sodium carbonate C complete combustion of methane D respiration

1 marks

Answer: A

This question in 0973/11 Oct/Nov 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 0973/11 May/June 2021

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 0973/12 May/June 2021

20 The colour of universal indicator in solutions S, T and U is shown. solution S T U colour of universal indicator orange green purple Which row shows the pH values of the solutions? S T U A 1 5 9 B 1 7 14 C 4 5 9 D 4 7 14

1 marks

Answer: D

This question in 0973/11 Oct/Nov 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 0973/11 Oct/Nov 2021

26 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 0973/11 May/June 2022

26 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 0973/12 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 0973/11 Oct/Nov 2022

21 Potassium oxide and sulfur dioxide are both soluble in water. Which row describes properties of these oxides? pH in aqueous effect on damp oxide solution red litmus A potassium oxide 14 turns blue B potassium oxide 2 stays red C sulfur dioxide 14 stays red D sulfur dioxide 2 turns blue

1 marks

Answer: A

This question in 0973/12 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 0973/12 May/June 2023

20 The waste from a factory is acidic. The factory treats the waste with limestone. Which row shows the pH of the waste before and after treatment? before after A 6 5 B 6 7 C 8 7 D 8 9

1 marks

Answer: B

This question in 0973/12 May/June 2024

25 Which compound contains two of the three elements needed in a fertiliser used for plant growth? A potassium carbonate B potassium chloride C potassium nitrate D potassium sulfate

1 marks

Answer: C

This question in 0973/12 May/June 2024

21 Which type of substance reacts with an acid to produce a salt, water and a gas? A alkali B base C carbonate D metal

1 marks

Answer: C

This question in 0973/11 Oct/Nov 2025