Air quality and climate — Paper 2 · IGCSE Sciences - Co-ordinated (9-1) 0973

13 What decreases as a result of eutrophication? A aerobic respiration by decomposers B decomposition of dead producers C dissolved oxygen in the water D growth of producers

1 marks

Answer: C

This question in 0973/21 May/June 2019

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 0973/21 May/June 2019

24 Sulfur dioxide, nitrogen monoxide and carbon monoxide are common pollutants in air. Which row shows a method of reducing the emissions of these pollutants into the air? sulfur dioxide nitrogen monoxide carbon monoxide A using low sulfur petrol using a catalytic converter using a catalytic converter B using calcium oxide using calcium oxide using a catalytic converter in a gas flue in a gas flue C using calcium oxide using calcium oxide using a catalytic converter in a gas flue in a gas flue D using calcium oxide using calcium oxide using a catalytic converter in a gas flue in a gas flue

1 marks

Answer: A

This question in 0973/22 May/June 2019

24 Which reaction does not take place in a catalytic converter? A 2CO + O2 → 2CO2 B 2NO → N2 + O2 C 2NO + 2CO → N2 + 2CO2 D 2SO2 + O2 → 2SO3

1 marks

Answer: D

This question in 0973/22 May/June 2020

23 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 0973/21 Oct/Nov 2020

23 Which statement explains how oxides of nitrogen are formed in a car engine? A Nitrogen from the air reacts with the fuel. B Oxygen and nitrogen from the air react together. C Oxygen from the air reacts with sulfur impurities in the fuel. D Oxygen from the air reacts with the fuel.

1 marks

Answer: B

This question in 0973/21 May/June 2021

23 Which statement explains how oxides of nitrogen are formed in a car engine? A Nitrogen from the air reacts with the fuel. B Oxygen and nitrogen from the air react together. C Oxygen from the air reacts with sulfur impurities in the fuel. D Oxygen from the air reacts with the fuel.

1 marks

Answer: B

This question in 0973/22 May/June 2021

23 Which row identifies a gas removed from exhaust emissions and a gas produced by a catalytic converter? gas removed gas produced A carbon dioxide carbon monoxide B carbon dioxide oxygen C nitrogen monoxide carbon monoxide D nitrogen monoxide oxygen

1 marks

Answer: D

This question in 0973/21 Oct/Nov 2021

23 Gases from a car engine travel through a catalytic converter and out through the exhaust. Some of the gases going into the converter are listed. 1 carbon dioxide 2 carbon monoxide 3 nitrogen 4 nitrogen monoxide Which gases increase in quantity in the catalytic converter? A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

1 marks

Answer: A

This question in 0973/22 May/June 2022

25 Which row describes conditions for the conversion of sulfur dioxide to sulfur trioxide in the Contact process? temperature / C catalyst A 200 iron B 200 vanadium(V) oxide C 450 iron D 450 vanadium(V) oxide

1 marks

Answer: D

This question in 0973/21 Oct/Nov 2022

22 Which atmospheric pollutant is removed from air by lime? A ammonia B carbon monoxide C hydrocarbons D sulfur dioxide

1 marks

Answer: D

This question in 0973/21 May/June 2023

22 Car engines produce pollutant gases. Which gases are removed by catalytic converters? A carbon monoxide, nitrogen monoxide and sulfur dioxide B carbon monoxide and nitrogen monoxide only C nitrogen monoxide and sulfur dioxide only D carbon dioxide and sulfur dioxide

1 marks

Answer: B

This question in 0973/22 May/June 2023

13 Forests are cut down and burnt in deforestation programmes. As a result of this, which gas in the atmosphere increases in concentration? A carbon dioxide B hydrogen C nitrogen D oxygen

1 marks

Answer: A

This question in 0973/21 Oct/Nov 2023

25 Catalytic converters are fitted to cars to remove some gases from exhaust emissions. Which gases are released by catalytic converters? A carbon dioxide and nitrogen B carbon dioxide and nitrogen monoxide C carbon monoxide and nitrogen D carbon monoxide and nitrogen monoxide

1 marks

Answer: A

This question in 0973/21 Oct/Nov 2023

24 Four equations are listed. 1 H2S2O7 + H2O  H2SO4 + SO3 + H2O 2 2S + 3O2  2SO3 3 H2SO4 + SO3  H2S2O7 4 2SO2 + O2  2SO3 Which equations represent reactions that are involved in the Contact process? A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

1 marks

Answer: D

This question in 0973/22 May/June 2024

25 Which substance is produced by the thermal decomposition of limestone? A calcium B calcium carbonate C calcium hydroxide D calcium oxide

1 marks

Answer: D

This question in 0973/22 May/June 2024

22 Which row shows a greenhouse gas and its environmental effect? gas environmental effect A methane acid rain B methane global warming C carbon monoxide acid rain D carbon monoxide global warming

1 marks

Answer: B

This question in 0973/22 May/June 2025

23 Which statement explains how oxides of nitrogen are formed in a car engine? A Nitrogen from the air reacts with the fuel. B Oxygen and nitrogen from the air react together. C Oxygen from the air reacts with sulfur impurities in the fuel. D Oxygen from the air reacts with the fuel.

1 marks

Answer: B

This question in 0973/22 May/June 2025