Oxides — Paper 2 · IGCSE Chemistry (9-1) 0971

17 Which statement about oxides is correct? A A solution of magnesium oxide has a pH less than pH 7. B A solution of sulfur dioxide has a pH greater than pH 7. C Magnesium oxide reacts with nitric acid to make a salt. D Sulfur dioxide reacts with hydrochloric acid to make a salt.

1 marks

Answer: C

This question in 0971/21 May/June 2018

33 Which statement about sulfur and its compounds is not correct? A Sulfur dioxide is used as a food preservative. B Sulfur dioxide turns acidified aqueous potassium manganate(VII) from purple to colourless. C Sulfur forms a basic oxide. D Sulfur is used in the manufacture of sulfuric acid.

1 marks

Answer: C

This question in 0971/21 May/June 2018

34 Which process is used to convert limestone (calcium carbonate) into lime? A electrolysis B fractional distillation C incomplete combustion D thermal decomposition

1 marks

Answer: D

This question in 0971/21 May/June 2018

17 In which row are the oxides correctly identified? acidic basic A magnesium oxide, calcium oxide sulfur dioxide, carbon dioxide B magnesium oxide, sulfur dioxide carbon dioxide, calcium oxide C sulfur dioxide, carbon dioxide calcium oxide, magnesium oxide D sulfur dioxide, magnesium oxide calcium oxide, carbon dioxide

1 marks

Answer: C

This question in 0971/22 Oct/Nov 2018

17 Nitrogen(I) oxide, N2O, nitrogen(II) oxide, NO, and carbon monoxide, CO, are all non-metal oxides. They do not react with acids or bases. Which statement is correct? A They are acidic oxides. B They are amphoteric oxides. C They are basic oxides. D They are neutral oxides.

1 marks

Answer: D

This question in 0971/21 May/June 2019

18 The positions of elements W, X, Y and Z in the Periodic Table are shown. W Y X Z Which elements form basic oxides? A W, X and Y B W and X only C Y only D Z only

1 marks

Answer: A

This question in 0971/21 May/June 2019

34 The diagram represents a lime kiln used to heat limestone to a very high temperature. waste gases lime kiln limestone fuel in fuel in air in air in X What leaves the kiln at X? A calcium carbonate B calcium hydroxide C calcium oxide D calcium sulfate

1 marks

Answer: C

This question in 0971/21 May/June 2019

19 Which oxide is classified as an amphoteric oxide? A aluminium oxide B calcium oxide C copper(II) oxide D nitrogen oxide

1 marks

Answer: A

This question in 0971/22 Oct/Nov 2019

35 Which statement about limestone and lime is correct? A Limestone combines with water to produce slaked lime. B Lime is obtained from limestone by oxidation. C Lime is used in the desulfurisation of flue gases. D Lime is used in the treatment of alkaline soil.

1 marks

Answer: C

This question in 0971/22 Oct/Nov 2019

27 Molten iron from the blast furnace contains impurities. The process of turning the impure iron into steel involves blowing oxygen into the molten iron and adding calcium oxide. What are the reasons for blowing in oxygen and adding calcium oxide? blowing in oxygen adding calcium oxide A carbon is removed by reacting with oxygen reacts with acidic impurities making slag B carbon is removed by reacting with oxygen reacts with slag and so removes it C iron reacts with the oxygen reacts with acidic impurities making slag D iron reacts with the oxygen reacts with slag and so removes it

1 marks

Answer: A

This question in 0971/21 May/June 2020

33 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 0971/21 May/June 2020

27 Molten iron from the blast furnace contains impurities. The process of turning the impure iron into steel involves blowing oxygen into the molten iron and adding calcium oxide. What are the reasons for blowing in oxygen and adding calcium oxide? blowing in oxygen adding calcium oxide A carbon is removed by reacting with oxygen reacts with acidic impurities making slag B carbon is removed by reacting with oxygen reacts with slag and so removes it C iron reacts with the oxygen reacts with acidic impurities making slag D iron reacts with the oxygen reacts with slag and so removes it

1 marks

Answer: A

This question in 0971/22 May/June 2020

23 Zinc oxide is an amphoteric oxide. Which row describes the reactions of zinc oxide? reaction reaction with alkalis with acids v v v x x v x x

1 marks

Answer: A

This question in 0971/22 Oct/Nov 2020

18 Element X forms an oxide, XO, that neutralises sulfuric acid. Which row describes X and XO? element X nature of oxide, XO A metal acidic B metal basic C non-metal acidic D non-metal basic

1 marks

Answer: B

This question in 0971/21 May/June 2021

18 Element X forms an oxide, XO, that neutralises sulfuric acid. Which row describes X and XO? element X nature of oxide, XO A metal acidic B metal basic C non-metal acidic D non-metal basic

1 marks

Answer: B

This question in 0971/22 May/June 2021

18 Oxide 1 is a solid that reacts with dilute hydrochloric acid. Oxide 2 is a gas that reacts with sodium hydroxide solution. What are the formulae of the oxides? oxide 1 oxide 2 A CaO MgO B MgO NO2 C NO2 SO2 D SO2 CaO

1 marks

Answer: B

This question in 0971/22 Oct/Nov 2021

18 The oxides of two elements, X and Y, are separately dissolved in water and the pH of each solution tested. oxide tested pH of solution X 1 Y 13 Which information about X and Y is correct? oxide is oxide is metal non-metal acidic basic A X Y X Y B X Y Y X C Y X X Y D Y X Y X

1 marks

Answer: B

This question in 0971/21 May/June 2022

26 Which statements about the general properties of metals are correct? 1 They are good conductors of heat and electricity. 2 They have low melting points. 3 They react with dilute acids to form a salt and water. 4 They react with oxygen to form basic oxides. A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

1 marks

Answer: B

This question in 0971/21 May/June 2022

34 What are the products when limestone (calcium carbonate) is heated strongly? A calcium hydroxide and carbon dioxide B calcium hydroxide and carbon monoxide C calcium oxide and carbon dioxide D calcium oxide and carbon monoxide

1 marks

Answer: C

This question in 0971/21 May/June 2022

18 The oxides of two elements, X and Y, are separately dissolved in water and the pH of each solution tested. oxide tested pH of solution X 1 Y 13 Which information about X and Y is correct? oxide is oxide is metal non-metal acidic basic A X Y X Y B X Y Y X C Y X X Y D Y X Y X

1 marks

Answer: B

This question in 0971/22 May/June 2022

34 What are the products when limestone (calcium carbonate) is heated strongly? A calcium hydroxide and carbon dioxide B calcium hydroxide and carbon monoxide C calcium oxide and carbon dioxide D calcium oxide and carbon monoxide

1 marks

Answer: C

This question in 0971/22 May/June 2022

18 X and Y are oxides of two different elements. ● X reacts with water to produce aqueous solution Z. ● Z turns universal indicator paper blue. ● An aqueous solution of Y reacts with sodium carbonate to produce carbon dioxide gas. Which statement is correct? A X and Y are both the oxides of metals. B X and Y are both the oxides of non-metals. C X is the oxide of a metal and Y is the oxide of a non-metal. D X is the oxide of a non-metal and Y is the oxide of a metal.

1 marks

Answer: C

This question in 0971/22 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 0971/22 Oct/Nov 2022

33 Which substance gives off carbon dioxide on heating? A lime B limestone C limewater D slaked lime

1 marks

Answer: B

This question in 0971/22 Oct/Nov 2022

16 Which oxide is classified as an amphoteric oxide? A aluminium oxide B calcium oxide C copper(II) oxide D nitrogen oxide

1 marks

Answer: A

This question in 0971/21 May/June 2023

17 Which statement about amphoteric oxides is correct? A They are made by combining an acidic oxide with a basic oxide. B They react with water to give a solution of pH 7. C They react with both acids and bases. D They do not react with acids or bases.

1 marks

Answer: C

This question in 0971/22 May/June 2023

20 Which element forms an oxide that reacts with an aqueous solution of a base? A argon B sulfur C magnesium D copper

1 marks

Answer: B

This question in 0971/22 Oct/Nov 2023

26 Four statements about the reactions of oxides with dilute hydrochloric acid and with aqueous sodium hydroxide are listed. 1 Aluminium oxide reacts with both dilute hydrochloric acid and aqueous sodium hydroxide. 2 Calcium oxide reacts with both dilute hydrochloric acid and aqueous sodium hydroxide. 3 Copper(II) oxide reacts with dilute hydrochloric acid but not with aqueous sodium hydroxide. 4 Sulfur dioxide does not react with either dilute hydrochloric acid or aqueous sodium hydroxide. Which statements are correct? A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

1 marks

Answer: B

This question in 0971/21 May/June 2024

31 Which oxide is used to neutralise acidic gases in flue gas desulfurisation? A calcium oxide B carbon dioxide C nitrogen oxide D sulfur dioxide

1 marks

Answer: A

This question in 0971/22 May/June 2024

21 Which row describes zinc oxide and calcium oxide? zinc oxide calcium oxide A basic acidic B acidic basic C amphoteric acidic D amphoteric basic

1 marks

Answer: D

This question in 0971/22 Oct/Nov 2024

20 Which three oxides are all acidic? A CaO, NO2, SO2 B CaO, CO2, Na2O C CO2, NO2, SO2 D CO2, Na2O, SO2

1 marks

Answer: C

This question in 0971/22 May/June 2025

21 Phosphorus is an element in Group V of the Periodic Table. It burns in air to form an oxide that dissolves in water to form a solution with a pH of 1. Which row describes this oxide of phosphorus? metal oxide nonmetal acidic oxide basic oxide x key Jv /=yes x X=no Jv

1 marks

Answer: C

This question in 0971/22 Oct/Nov 2025