Air quality and climate — Paper 1 · IGCSE Chemistry (9-1) 0971

27 Dry air is passed over hot copper until all the oxygen has reacted. dry air copper heat The volume of gas at the end of the reaction is 120 cm3. What is the starting volume of dry air? A 132 cm3 B 152 cm3 C 180 cm3 D 570 cm3

1 marks

Answer: B

This question in 0971/11 May/June 2018

31 Which statement is correct? A Atmospheric carbon dioxide is not a cause of climate change. B Atmospheric methane is produced by respiration. C Burning natural gas decreases the level of carbon dioxide in the atmosphere. D Decomposition of vegetation causes an increase in atmospheric methane.

1 marks

Answer: D

This question in 0971/11 May/June 2018

29 Four sources of air pollution are listed. 1 burning fossil fuels containing sulfur 2 nitrogen reacting with oxygen in car engines 3 incomplete combustion of carbon fuels 4 adding lead compounds to petrol Which sources produce acid rain? A 1 and 2 B 1 and 3 C 2 and 3 D 3 and 4

1 marks

Answer: A

This question in 0971/11 May/June 2019

32 Which statement describes a disadvantage of sulfur dioxide? A It can be used as a bleach when making wood pulp. B It can be used to kill bacteria in food. C It can be used to manufacture sulfuric acid. D It dissolves in water to form acid rain.

1 marks

Answer: D

This question in 0971/11 May/June 2019

29 Clean, dry air contains nitrogen, oxygen and small amounts of other gases. The noble gases have been left out of the table. Which row shows the composition of clean, dry air? nitrogen / % oxygen / % other gases A 21 78 small amount of carbon dioxide B 21 78 small amount of carbon monoxide C 78 21 small amount of carbon dioxide D 78 21 small amount of carbon monoxide

1 marks

Answer: C

This question in 0971/12 Oct/Nov 2019

30 The apparatus shown is set up and left for a week. damp iron wool air water Which diagram shows the level of the water at the end of the week? A B C D

1 marks

Answer: B

This question in 0971/12 Oct/Nov 2019

32. Which information about carbon dioxide and methane is correct? carbon dioxide methane A | formed when vegetation decomposes v x B greenhouse gas Jv Jv Cc present in unpolluted air x Xx D produced during respiration x Jv key J/ = true X = false

1 marks

Answer: B

This question in 0971/12 Oct/Nov 2019

33 Which statement about the uses of sulfur dioxide is not correct? A It is used as a bleach in the manufacture of paper. B It is used as a food preservative. C It is used in the manufacture of cement. D It is used in the manufacture of sulfuric acid.

1 marks

Answer: C

This question in 0971/12 Oct/Nov 2019

29 Some gases are present in clean air while other gases are only present in polluted air. Which row is correct? a gas present a gas only present in clean air in polluted air A argon carbon dioxide B argon nitrogen dioxide C sulfur dioxide carbon dioxide D sulfur dioxide nitrogen dioxide

1 marks

Answer: B

This question in 0971/11 May/June 2020

32 Which processes produce methane? 1 complete combustion of carbon-containing compounds 2 decomposition of vegetation 3 digestion in animals 4 respiration in animals A 1 and 4 B 1 and 3 C 2 and 3 D 2 and 4

1 marks

Answer: C

This question in 0971/11 May/June 2020

33 The list shows four methods that were suggested for the formation of carbon dioxide. 1 cracking methane using steam 2 action of heat on a carbonate 3 complete combustion of methane 4 reaction of a carbonate with oxygen Which methods would result in the production of carbon dioxide? A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

1 marks

Answer: C

This question in 0971/11 May/June 2020

34 A student suggests three uses of calcium carbonate (limestone). 1 manufacture of cement 2 manufacture of iron 3 treating alkaline soils Which suggestions are correct? 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 0971/11 May/June 2020

29 Which compounds both contribute to ‘acid rain’? A carbon monoxide and lead compounds B carbon monoxide and oxides of nitrogen C oxides of nitrogen and sulfur dioxide D sulfur dioxide and lead compounds

1 marks

Answer: C

This question in 0971/12 May/June 2020

32 X is a colourless greenhouse gas. It is a waste product from digestion in animals. It is generally unreactive, but it can be burnt. What is X? A carbon dioxide B methane C nitrogen D sulfur dioxide

1 marks

Answer: B

This question in 0971/12 May/June 2020

33 The list shows four methods that were suggested for the formation of carbon dioxide. 1 cracking methane using steam 2 action of heat on a carbonate 3 complete combustion of methane 4 reaction of a carbonate with oxygen Which methods would result in the production of carbon dioxide? A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

1 marks

Answer: C

This question in 0971/12 May/June 2020

34 A student suggests three uses of calcium carbonate (limestone). 1 manufacture of cement 2 manufacture of iron 3 treating alkaline soils Which suggestions are correct? 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 0971/12 May/June 2020

31 Oxides of nitrogen are given out from car exhausts. Which row best shows why oxides of nitrogen are unwanted in the atmosphere? acidic toxic A no no B no yes C yes no D yes yes

1 marks

Answer: D

This question in 0971/12 Oct/Nov 2020

29 Which two gases make up approximately 99% of clean, dry air? A carbon dioxide and nitrogen B carbon dioxide and oxygen C nitrogen and oxygen D argon and nitrogen

1 marks

Answer: C

This question in 0971/11 May/June 2021

30 Which process does not produce a greenhouse gas? A acid rain on limestone buildings B combustion of wood C digestion in cows D zinc reacting with sulfuric acid

1 marks

Answer: D

This question in 0971/12 Oct/Nov 2021

31 Sulfur burns to make sulfur dioxide. Which row describes a source of sulfur and a use of sulfur dioxide? source of sulfur use of sulfur dioxide A the air food preservative B the air treating acidic soils C underground deposits food preservative D underground deposits treating acidic soils

1 marks

Answer: C

This question in 0971/12 Oct/Nov 2021

32 Which process produces methane? A combustion of hydrocarbons B decomposition of vegetation C respiration D reaction between hydrochloric acid and calcium carbonate

1 marks

Answer: B

This question in 0971/11 May/June 2022

33 Which statements about sulfur dioxide are correct? 1 Sulfur dioxide decolourises acidified potassium manganate(VII). 2 Sulfur dioxide forms when acids react with carbonates. 3 Sulfur dioxide is used as a bleach. 4 Sulfur dioxide is used to treat acidic soil. A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

1 marks

Answer: A

This question in 0971/11 May/June 2022

29 Which row identifies a substance present in clean air and a substance that is a pollutant in air? present in clean air pollutant in air A oxides of nitrogen nitrogen B carbon dioxide sulfur dioxide C carbon monoxide lead compounds D nitrogen argon

1 marks

Answer: B

This question in 0971/12 May/June 2022

30 Which property of sulfur dioxide explains why it is used as a food preservative? A acidic oxide B bleach C kills bacteria D pungent smell

1 marks

Answer: C

This question in 0971/12 May/June 2022

29 Which substance in polluted air damages stonework and kills trees? A carbon dioxide B carbon monoxide C lead compounds D sulfur dioxide

1 marks

Answer: D

This question in 0971/12 Oct/Nov 2022

32 Which element has an oxide that is used as a food preservative? A helium B hydrogen C iron D sulfur

1 marks

Answer: D

This question in 0971/12 Oct/Nov 2022

31 Some information about gas X is listed. ● It is not present in clean, dry air. ● It is not a cause of respiratory problems. ● It is responsible for global warming. What is X? A carbon dioxide B carbon monoxide C methane D nitrogen dioxide

1 marks

Answer: C

This question in 0971/11 May/June 2023

25 Which compounds both contribute to acid rain? A carbon monoxide and carbon dioxide B carbon monoxide and oxides of nitrogen C oxides of nitrogen and sulfur dioxide D sulfur dioxide and carbon dioxide

1 marks

Answer: C

This question in 0971/12 May/June 2023

31 The percentage composition of gases on Neptune is shown. percentage gas composition / % hydrogen 80 helium 18 methane 1.5 other gases 0.5 Which statement about the atmospheres on Neptune and on the Earth is correct? A There is more helium on Neptune than oxygen on the Earth. B There is less methane on Neptune than carbon dioxide on the Earth. C There is less hydrogen on the Earth than on Neptune. D There is more helium on the Earth than on Neptune.

1 marks

Answer: C

This question in 0971/12 May/June 2023

2 Which statements about clean, dry air are correct? 1 It is a mixture of elements only. 2 It is a mixture of elements and compounds. 3 It contains only non-metals. A 1 and 3 B 1 only C 2 and 3 D 2 only

1 marks

Answer: C

This question in 0971/12 Oct/Nov 2023

10 Limestone is used to reduce sulfur dioxide emissions from coal-fired power stations. The equation for the reaction is shown. CaCO3 + SO2 → CaSO3 + CO2 What is the smallest mass of CaCO3 required to remove 1 tonne of SO2? A 1 tonne B 2 tonnes C 64 tonnes D 100 tonnes

1 marks

Answer: B

This question in 0971/12 Oct/Nov 2023

30 Which process removes carbon dioxide from the atmosphere? A photosynthesis B thermal decomposition of calcium carbonate C combustion of fossil fuels D reaction of sodium carbonate with an acid

1 marks

Answer: A

This question in 0971/12 Oct/Nov 2023

33 What are the main substances produced by the fractional distillation of liquid air? A oxygen and carbon dioxide B oxygen and nitrogen C helium and nitrogen D hydrogen and oxygen

1 marks

Answer: B

This question in 0971/12 Oct/Nov 2023

28 Which reaction produces carbon dioxide? A cracking of large hydrocarbon molecules B photosynthesis C reaction of a base with a carbonate D thermal decomposition of calcium carbonate

1 marks

Answer: D

This question in 0971/11 May/June 2024

29 A sample of air containing four gases only is analysed. 99.0% of the sample contains the two main gases in the same percentages as in clean, dry air. The remaining 1.0% of the sample contains argon and carbon dioxide. The gas that makes up 0.1% of the sample turns limewater milky. Which row shows the percentage composition of the sample of air? 99.0% of the sample 0.9% of the sample 0.1% of the sample A 78.0% nitrogen, 21.0% oxygen argon carbon dioxide B 78.0% nitrogen, 21.0% oxygen carbon dioxide argon C 78.0% oxygen, 21.0% nitrogen argon carbon dioxide D 78.0% oxygen, 21.0% nitrogen carbon dioxide argon

1 marks

Answer: A

This question in 0971/11 May/June 2024

31 Which statement about sulfur is correct? A When sulfur is burned, it produces a substance that causes acid rain. B Sulfur is produced by the thermal decomposition of limestone. C Compounds of sulfur make up approximately 1% of unpolluted air. D Sulfur is a member of the family of elements called halogens.

1 marks

Answer: A

This question in 0971/11 May/June 2024

32 What are two adverse effects of particulates in the air? 1 acid rain 2 cancer 3 photochemical smog 4 respiratory problems A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

1 marks

Answer: D

This question in 0971/11 May/June 2024

32 Four gases found in air are listed. 1 carbon dioxide 2 carbon monoxide 3 methane 4 sulfur dioxide Which gases lead directly to global warming when their concentrations are increased? A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

1 marks

Answer: A

This question in 0971/12 May/June 2024

32 What is produced by the incomplete combustion of methane? A carbon monoxide B hydrogen C lead compounds D sulfur dioxide

1 marks

Answer: A

This question in 0971/11 May/June 2025

30 In the experiment shown, 100 cm3 of clean, dry air is passed backwards and forwards through a tube containing heated copper until there is no further decrease in the volume of the air. copper air gas syringe heat All of the gas is pushed into one syringe. What is the final reading on this gas syringe? A 0 cm3 B 21 cm3 C 79 cm3 D 100 cm3

1 marks

Answer: C

This question in 0971/12 May/June 2025

31 Sulfur dioxide, carbon monoxide and oxides of nitrogen are gaseous pollutants found in the air. Which pollutants contribute to acid rain? A carbon monoxide and sulfur dioxide B oxides of nitrogen and sulfur dioxide C oxides of nitrogen only D sulfur dioxide only

1 marks

Answer: B

This question in 0971/12 May/June 2025

31 Clean, dry air contains nitrogen, oxygen and small amounts of other gases. The noble gases have been left out of the table. Which row shows the composition of clean, dry air? nitrogen / % oxygen / % other gases A 21 78 small amount of carbon dioxide B 21 78 small amount of carbon monoxide C 78 21 small amount of carbon dioxide D 78 21 small amount of carbon monoxide

1 marks

Answer: C

This question in 0971/12 Oct/Nov 2025

33 Gas X is a waste gas from digestion in animals. Gas Y is formed when gas X is burned with an insufficient amount of oxygen. Gas Z is formed when gas X is burned with an excess of oxygen. What are X, Y and Z? X Y Z A carbon dioxide methane carbon monoxide B carbon monoxide methane carbon dioxide C methane carbon dioxide carbon monoxide D methane carbon monoxide carbon dioxide

1 marks

Answer: D

This question in 0971/12 Oct/Nov 2025

34 Which statement about photosynthesis is correct? A It decreases the amount of oxygen in the atmosphere. B It is a reaction between carbon dioxide and water. C It produces a gas that contributes to increased global warming. D It requires a temperature greater than 50 °C.

1 marks

Answer: B

This question in 0971/12 Oct/Nov 2025