Air quality and climate — Paper 1 · IGCSE Sciences - Co-ordinated (9-1) 0973

24 Which processes lead to the formation of a greenhouse gas? 1 reaction of sodium with water 2 respiration 3 combustion of fossil fuels A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3

1 marks

Answer: C

This question in 0973/11 May/June 2019

24 Why do farmers treat their fields with fertilisers? A to decrease the acidity of the soil B to increase the oxygen content of the soil C to increase the water content of the soil D to increase the yield of crops

1 marks

Answer: D

This question in 0973/11 May/June 2020

24 Which statement about fertilisers is correct? A They are fed to animals to improve the animals’ growth. B They contain only nitrogen, phosphorus and potassium as elements. C They increase plant growth by adding chemicals directly to plant flowers. D They increase plant growth by adding chemicals to the soil.

1 marks

Answer: D

This question in 0973/12 May/June 2020

24 Which gas is an acidic pollutant in air? A argon B carbon monoxide C sulfur dioxide D water vapour

1 marks

Answer: C

This question in 0973/11 Oct/Nov 2020

24 Which process does not produce carbon dioxide? A complete combustion of fossil fuels B reaction of an acid with a carbonate C respiration in plants D rusting iron

1 marks

Answer: D

This question in 0973/11 Oct/Nov 2021

25 Which statements about limestone are correct? 1 Its main constituent is calcium oxide. 2 It can be used to manufacture lime. 3 It thermally decomposes to release carbon dioxide. 4 It is used to neutralise alkaline soils. A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

1 marks

Answer: C

This question in 0973/11 May/June 2023

24 Which element is used in the manufacture of sulfuric acid? A carbon B hydrogen C nitrogen D sulfur

1 marks

Answer: D

This question in 0973/12 May/June 2023

19 When petrol burns in a car engine, carbon monoxide, CO, and nitrogen monoxide, NO, are produced. These gases pass through a catalytic converter where carbon monoxide reacts with nitrogen monoxide. The equation for the reaction is shown. carbon monoxide + nitrogen monoxide → nitrogen + carbon dioxide Which statement is not correct? A Carbon monoxide is oxidised in the catalytic converter. B Carbon monoxide is produced by the complete combustion of petrol. C Nitrogen from the air is oxidised in the car engine. D Nitrogen monoxide is reduced in the catalytic converter.

1 marks

Answer: B

This question in 0973/11 Oct/Nov 2023

25 Which gas is present in clean air? A carbon dioxide B carbon monoxide C nitrogen dioxide D sulfur dioxide

1 marks

Answer: A

This question in 0973/11 Oct/Nov 2023

25 Water vapour, carbon dioxide and the noble gases are removed from a 100 cm3 sample of clean air. What is the remaining volume? A 1 cm3 B 21 cm3 C 78 cm3 D 99 cm3

1 marks

Answer: D

This question in 0973/11 May/June 2024

23 The diagram represents the composition of clean, dry air. gas Y gas X Which row identifies gas X and gas Y? gas X gas Y A nitrogen oxygen B oxygen nitrogen C oxygen carbon dioxide D carbon dioxide nitrogen

1 marks

Answer: A

This question in 0973/12 May/June 2025

24 Which air pollutants are produced by the combustion of fossil fuels in car engines? A carbon monoxide, oxides of nitrogen and sulfur dioxide B carbon monoxide and sulfur dioxide only C carbon monoxide and oxides of nitrogen only D oxides of nitrogen and sulfur dioxide only

1 marks

Answer: A

This question in 0973/11 Oct/Nov 2025

30 Which method of generating electrical power causes carbon dioxide to be released into the atmosphere? A combustion of fossil fuels B nuclear fission C use of solar cells D use of wind turbines

1 marks

Answer: A

This question in 0973/11 Oct/Nov 2025