Air quality and climate — Paper 2 · IGCSE Science - Combined 0653

13 Which two gases contribute most to global warming? A carbon dioxide and methane B carbon monoxide and carbon dioxide C methane and oxygen D oxygen and carbon monoxide

1 marks

Answer: A

This question in 0653/22 Feb/March 2017

26 Which pie chart shows the proportions of gases in clean air? A B C D N2 N2 O2 N2 N2 O2 other O2 CO2 gases O2 CO2 CO2 other other CO2 other gases gases gases

1 marks

Answer: A

This question in 0653/21 May/June 2017

26 Which pie chart shows the proportions of gases in clean air? A B C D N2 N2 O2 N2 N2 O2 other O2 CO2 gases O2 CO2 CO2 other other CO2 other gases gases gases

1 marks

Answer: A

This question in 0653/22 May/June 2017

25 Which pie chart shows the proportions of gases in clean air? A B C D N2 N2 O2 N2 N2 O2 other O2 CO2 gases O2 CO2 CO2 other other CO2 other gases gases gases

1 marks

Answer: A

This question in 0653/23 May/June 2017

26 Which process does not contribute to increasing levels of carbon dioxide in the air? A burning petrol and diesel in cars B combustion of the sulfur compounds in petrol and diesel C destroying rainforests D releasing waste gases from coal-fired power stations

1 marks

Answer: B

This question in 0653/23 May/June 2017

13 Which gas dissolves in water vapour to produce acid rain? A methane B nitrogen C oxygen D sulfur dioxide

1 marks

Answer: D

This question in 0653/21 Oct/Nov 2017

26 P, Q, R and S are four gases found in clean air. P is very unreactive. Q makes up 21% of the air. R makes up 78% of the air. S is formed when fossil fuels are burned. Which row is correct? P Q R S A argon nitrogen oxygen carbon dioxide B argon oxygen nitrogen carbon dioxide C carbon dioxide oxygen nitrogen argon D carbon dioxide nitrogen oxygen argon

1 marks

Answer: B

This question in 0653/21 Oct/Nov 2017

26 P, Q, R and S are four gases found in clean air. P is very unreactive. Q makes up 21% of the air. R makes up 78% of the air. S is formed when fossil fuels are burned. Which row is correct? P Q R S A argon nitrogen oxygen carbon dioxide B argon oxygen nitrogen carbon dioxide C carbon dioxide oxygen nitrogen argon D carbon dioxide nitrogen oxygen argon

1 marks

Answer: B

This question in 0653/22 Oct/Nov 2017

26 P, Q, R and S are four gases found in clean air. P is very unreactive. Q makes up 21% of the air. R makes up 78% of the air. S is formed when fossil fuels are burned. Which row is correct? P Q R S A argon nitrogen oxygen carbon dioxide B argon oxygen nitrogen carbon dioxide C carbon dioxide oxygen nitrogen argon D carbon dioxide nitrogen oxygen argon

1 marks

Answer: B

This question in 0653/23 Oct/Nov 2017

26 A gas that causes climate change is formed during the extraction of iron from iron ore. Which solution reacts with this gas? A aqueous sodium chloride B hydrochloric acid C dilute sulfuric acid D limewater

1 marks

Answer: D

This question in 0653/22 Feb/March 2018

13 Which statement about greenhouse gases is correct? A They are caused by acid rain. B They are produced by photosynthesis. C They generate heat when they react with sunlight. D They reduce the loss of heat from the Earth.

1 marks

Answer: D

This question in 0653/21 May/June 2018

26 Which process produces a gas that contributes to climate change? A the electrolysis of molten lead(II) bromide B the reaction of calcium with water C the reaction of copper oxide with dilute sulfuric acid D the thermal decomposition of calcium carbonate

1 marks

Answer: D

This question in 0653/21 May/June 2018

13 What are the effects of acid rain? damage to limestone buildings damage to trees v 09 WD > <j & < x v x x

1 marks

Answer: B

This question in 0653/22 May/June 2018

26 Which process produces a gas that contributes to climate change? A the electrolysis of molten lead(II) bromide B the reaction of calcium with water C the reaction of copper oxide with dilute sulfuric acid D the thermal decomposition of calcium carbonate

1 marks

Answer: D

This question in 0653/22 May/June 2018

26 Which process produces a gas that contributes to climate change? A the electrolysis of molten lead(II) bromide B the reaction of calcium with water C the reaction of copper oxide with dilute sulfuric acid D the thermal decomposition of calcium carbonate

1 marks

Answer: D

This question in 0653/23 May/June 2018

25 Some statements about gases in the air are listed. 1 The amount of carbon dioxide in the atmosphere is increased by burning fossil fuels. 2 Methane is a greenhouse gas. 3 Increasing carbon dioxide in the atmosphere decreases the greenhouse effect. 4 Methane is a product of respiration. Which statements describe factors that contribute to climate change? A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

1 marks

Answer: A

This question in 0653/22 Feb/March 2019

25 Which gas is not present in clean air? A carbon monoxide B neon C nitrogen D water vapour

1 marks

Answer: A

This question in 0653/21 Oct/Nov 2019

26 Which two gases cause an enhanced greenhouse effect when their concentrations in the atmosphere increase? A carbon monoxide and carbon dioxide B carbon dioxide and methane C methane and sulfur dioxide D sulfur dioxide and carbon monoxide

1 marks

Answer: B

This question in 0653/21 Oct/Nov 2019

13 The table shows the possible effects of two processes on the concentration of two gases in the atmosphere. concentration of gases in atmosphere process carbon dioxide oxygen 1 combustion of fossil fuels decrease increase 2 combustion of fossil fuels increase decrease 3 deforestation decrease increase 4 deforestation increase decrease Which rows show the effects of deforestation and combustion of fossil fuels on the concentration of carbon dioxide and oxygen in the atmosphere? A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

1 marks

Answer: D

This question in 0653/22 Oct/Nov 2019

24 What is the composition of clean air? A 78% nitrogen, 21% carbon dioxide and small amounts of other gases B 78% nitrogen, 21% oxygen and small amounts of other gases C 78% oxygen, 21% carbon dioxide and small amounts of other gases D 78% oxygen, 21% nitrogen and small amounts of other gases

1 marks

Answer: B

This question in 0653/22 Oct/Nov 2019

25 Which two gases cause an enhanced greenhouse effect when their concentrations in the atmosphere increase? A carbon monoxide and carbon dioxide B carbon dioxide and methane C methane and sulfur dioxide D sulfur dioxide and carbon monoxide

1 marks

Answer: B

This question in 0653/22 Oct/Nov 2019

24 Which row describes the percentage composition of clean air? carbon dioxide nitrogen noble gases oxygen A less than 1 78 less than 1 21 B less than 1 78 21 less than 1 C 21 less than 1 less than 1 78 D 78 less than 1 less than 1 21

1 marks

Answer: A

This question in 0653/23 Oct/Nov 2019

25 Which two gases cause an enhanced greenhouse effect when their concentrations in the atmosphere increase? A carbon monoxide and carbon dioxide B carbon dioxide and methane C methane and sulfur dioxide D sulfur dioxide and carbon monoxide

1 marks

Answer: B

This question in 0653/23 Oct/Nov 2019

26 Which volume of air contains about 20 cm3 of oxygen? A 25 cm3 B 50 cm3 C 80 cm3 D 100 cm3

1 marks

Answer: D

This question in 0653/21 May/June 2020

26 Which row about a gas in clean air is correct? name of gas percentage of gas A nitrogen 20 B nitrogen 50 C oxygen 20 D oxygen 50

1 marks

Answer: C

This question in 0653/22 May/June 2020

26 Which process does not produce carbon dioxide? A complete combustion of methane B cracking of large alkane molecules C reaction between an acid and magnesium carbonate D thermal decomposition of calcium carbonate

1 marks

Answer: B

This question in 0653/22 Oct/Nov 2020

26 A petrol car engine takes in clean air and lets out exhaust gases. exhaust clean air in gases out Which gas has a higher concentration in the exhaust gases than in clean air? A argon B carbon dioxide C nitrogen D oxygen

1 marks

Answer: B

This question in 0653/22 Feb/March 2021

26 Which gases may contribute to climate change when their concentrations in the air increase? 1 carbon dioxide 2 methane 3 sulfur dioxide A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3

1 marks

Answer: A

This question in 0653/21 May/June 2021

26 Which statement about greenhouse gases is correct? A They are gases in Group VIII of the Periodic Table. B They cause acid rain. C They contribute to climate change. D They make up most of the atmosphere.

1 marks

Answer: C

This question in 0653/22 May/June 2021

26 Which statement about greenhouse gases is correct? A Greenhouse gases cause acid rain. B The combustion of fossil fuels produces greenhouse gases. C Nitrogen is a greenhouse gas. D Greenhouse gases are removed from the atmosphere by respiration.

1 marks

Answer: B

This question in 0653/23 May/June 2021

25 Which statement about carbon dioxide is correct? A Carbon dioxide is the only greenhouse gas. B Carbon dioxide makes up approximately 4% of clean air. C Increased concentrations of carbon dioxide enhance the greenhouse effect. D The only source of carbon dioxide in the air is from motor vehicles.

1 marks

Answer: C

This question in 0653/22 Feb/March 2022

26 Which statements about air pollutants are correct? 1 Sulfur dioxide can damage buildings. 2 Oxides of nitrogen are harmful to health. 3 Carbon monoxide is a poisonous gas. 4 Carbon monoxide can damage buildings. A 1, 2 and 3 B 1 and 2 only C 2, 3 and 4 D 3 and 4 only

1 marks

Answer: A

This question in 0653/22 Feb/March 2023

33 Which type of power station produces greenhouse gases when generating electricity? A coal-fired B geothermal C hydroelectric D wind-powered

1 marks

Answer: A

This question in 0653/22 Feb/March 2023

25 Which statement about both carbon dioxide and methane is correct? A Increased concentrations of carbon dioxide and methane in the air cause an enhanced greenhouse effect. B Methane and carbon dioxide are hydrocarbons. C Respiration increases the concentration of carbon dioxide and methane in the air. D The combustion of fossil fuels increases the concentration of carbon dioxide and methane in the air.

1 marks

Answer: A

This question in 0653/21 May/June 2023

25 What is an effect of increasing the amount of carbon dioxide in the atmosphere? A increased acid rain B increased climate change C increased damage to buildings D increased health problems

1 marks

Answer: B

This question in 0653/22 May/June 2023

25 Some gases in air are listed. 1 carbon dioxide 2 oxygen 3 methane 4 sulfur dioxide Which gases cause an enhanced greenhouse effect when their concentration in the air increases? A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

1 marks

Answer: B

This question in 0653/23 May/June 2023

26 Which gases can directly cause an enhanced greenhouse effect? A carbon monoxide and carbon dioxide B carbon dioxide and methane C nitrogen dioxide and sulfur dioxide D sulfur dioxide and methane

1 marks

Answer: B

This question in 0653/21 Oct/Nov 2023

26 Which two substances react together to increase the concentration of a gas in the air that may contribute to climate change? A sodium oxide and carbon B potassium carbonate and dilute hydrochloric acid C sodium and water D zinc and dilute nitric acid

1 marks

Answer: B

This question in 0653/22 Oct/Nov 2023

26 Which processes contribute to the enhanced greenhouse effect? 1 the electrolysis of concentrated aqueous sodium chloride 2 the extraction of iron in a blast furnace 3 the reaction of magnesium with dilute hydrochloric acid 4 the reaction of sodium carbonate with dilute hydrochloric acid A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

1 marks

Answer: C

This question in 0653/23 Oct/Nov 2023

25 What causes an enhanced greenhouse effect? A decreased concentration of methane in the atmosphere B decreased concentration of nitrogen in the atmosphere C increased concentration of carbon dioxide in the atmosphere D increased concentration of oxygen in the atmosphere

1 marks

Answer: C

This question in 0653/22 May/June 2024

25 Which pie chart shows the composition of clean air? A B carbon dioxideother gases carbon dioxideother gases nitrogen oxygen nitrogen oxygen C D other gases other gases carbon dioxide carbon dioxide nitrogen oxygen oxygen nitrogen

1 marks

Answer: A

This question in 0653/21 Oct/Nov 2024

26 Which statement about greenhouse gases is correct? A Increased concentrations of greenhouse gases cause a reduced greenhouse effect, which may contribute to climate change. B Increased concentrations of greenhouse gases cause an enhanced greenhouse effect, which may contribute to climate change. C Increased concentrations of greenhouse gases cause an enhanced greenhouse effect, which does not contribute to climate change. D Decreased concentrations of greenhouse gases cause an enhanced greenhouse effect, which may contribute to climate change.

1 marks

Answer: B

This question in 0653/23 Oct/Nov 2024

27 Carbon dioxide is a greenhouse gas. Which statements describe why carbon dioxide leads to increased global warming? 1 Carbon dioxide absorbs thermal energy from the Earth’s surface. 2 Carbon dioxide reduces the loss of thermal energy into space. 3 Carbon dioxide dissolves in water to produce acid rain. A 1 and 2 B 1 and 3 C 1 only D 3 only

1 marks

Answer: A

This question in 0653/22 Feb/March 2025

27 Which row correctly explains a strategy to reduce the effects of climate change? strategy explanation A plant more trees trees use up land for growing crops B reduce livestock farming livestock produce methane C decrease the use of fossil fuels combustion of fossil fuels produces nitrogen D increase the use of solar power solar power uses up energy from the Sun

1 marks

Answer: B

This question in 0653/21 May/June 2025

23 Which graph explains why scientists are concerned about climate change? A B concentration of concentration of carbon dioxide in carbon dioxide in the atmosphere the atmosphere year 2025 year 2025 C D concentration of concentration of carbon dioxide in carbon dioxide in the atmosphere the atmosphere year 2025 year 2025

1 marks

Answer: B

This question in 0653/23 May/June 2025

21 The diagrams show molecules of three of the main gases in clean, dry air. The different circles represent atoms of different elements. Which elements are shown as and ? A hydrogen nitrogen B hydrogen oxygen C oxygen hydrogen D oxygen nitrogen

1 marks

Answer: D

This question in 0653/21 Oct/Nov 2025

26 Which statement describes how greenhouse gases in the Earth’s atmosphere cause global warming? A They absorb all the thermal energy that reaches the Earth from the Sun. B They absorb all the thermal energy that is reflected from the Earth’s surface. C They absorb some of the thermal energy that is reflected from the Earth’s surface. D They increase thermal energy loss to space.

1 marks

Answer: C

This question in 0653/21 Oct/Nov 2025

25 Which statement about methane is correct? A Its increase in the atmosphere contributes to climate change. B It reacts with steam in the presence of an acid catalyst. C It has the molecular formula CH3OH. D It reacts with bromine in an addition reaction.

1 marks

Answer: A

This question in 0653/23 Oct/Nov 2025