Oxides — Paper 2 · IGCSE Sciences - Co-ordinated (Double) 0654

20 Which trend is observed as the Periodic Table is crossed from left to right? A The elements change from metallic to non-metallic and the oxides of the elements change from acidic to basic. B The elements change from metallic to non-metallic and the oxides of the elements change from basic to acidic. C The elements change from non-metallic to metallic and the oxides of the elements change from acidic to basic. D The elements change from non-metallic to metallic and the oxides of the elements change from basic to acidic.

1 marks

Answer: B

This question in 0654/21 Oct/Nov 2017

25 Which word equation describes the manufacture of lime from limestone? A calcium carbonate → calcium hydroxide + carbon dioxide B calcium carbonate → calcium oxide + carbon dioxide C calcium hydroxide → calcium oxide + water D calcium oxide + carbon dioxide → calcium carbonate

1 marks

Answer: B

This question in 0654/21 Oct/Nov 2017

25 Which word equation describes the manufacture of lime from limestone? A calcium carbonate → calcium hydroxide + carbon dioxide B calcium carbonate → calcium oxide + carbon dioxide C calcium hydroxide → calcium oxide + water D calcium oxide + carbon dioxide → calcium carbonate

1 marks

Answer: B

This question in 0654/22 Oct/Nov 2017

24 In the Contact process, sulfur trioxide is absorbed by concentrated sulfuric acid and then diluted with water. Which statement about the reaction between sulfur trioxide and water explains why sulfur trioxide is not dissolved directly in water? A A catalyst is required. B It is a slow reaction. C It is endothermic and produces a sulfuric acid mist. D It is exothermic and produces a sulfuric acid mist.

1 marks

Answer: D

This question in 0654/23 Oct/Nov 2017

25 Which word equation describes the manufacture of lime from limestone? A calcium carbonate → calcium hydroxide + carbon dioxide B calcium carbonate → calcium oxide + carbon dioxide C calcium hydroxide → calcium oxide + water D calcium oxide + carbon dioxide → calcium carbonate

1 marks

Answer: B

This question in 0654/23 Oct/Nov 2017

21 Aqueous solutions of oxides X, Y and Z are tested using Universal Indicator. Oxide X turns the indicator red. Oxide Y turns the indicator blue. Oxide Z turns the indicator green. Which row describes these three substances? X Y Z A acidic basic basic B acidic basic neutral C basic acidic acidic D basic acidic neutral

1 marks

Answer: B

This question in 0654/23 Oct/Nov 2018

19 Some properties of four oxides, W, X, Y and Z, are shown. property W X Y Z reaction with acids yes no no yes reaction with alkalis no yes no yes Which row classifies these oxides? W X Y Z A acidic basic neutral amphoteric B acidic basic amphoteric neutral C basic acidic amphoteric neutral D basic acidic neutral amphoteric

1 marks

Answer: D

This question in 0654/21 May/June 2019

22 Four oxides, W, X, Y and Z, are added separately to an acid and to an alkali. The results are shown. W X Y Z acid no reaction reaction reaction no reaction alkali reaction no reaction reaction no reaction Which statements about these oxides are correct? 1 Y is neutral and Z is amphoteric. 2 W is acidic and X is basic. 3 W is basic and X is neutral. 4 Y is amphoteric and Z is neutral. A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

1 marks

Answer: D

This question in 0654/23 May/June 2019

20 X is an oxide. When solid X is added to dilute hydrochloric acid, the pH of the solution increases. When solid X is added to aqueous sodium hydroxide, the pH of the solution decreases. Which type of oxide is X? A acidic B amphoteric C basic D neutral

1 marks

Answer: B

This question in 0654/21 May/June 2020

25 Limestone is converted to lime in process 1. Limestone is used to treat industrial waste in process 2. What are processes 1 and 2? process 1 process 2 A decomposition dissolving B decomposition neutralisation C oxidation dissolving D oxidation neutralisation

1 marks

Answer: B

This question in 0654/21 May/June 2020

19 Aluminium oxide, Al,O3, nitrogen monoxide, NO, and sulfur trioxide, SO3, are each tested with dilute hydrochloric acid and with aqueous sodium hydroxide. The results are shown. oxide aqueous dilute aqueous — hydrochloric acid sodium hydroxide Al203 Jv Jv key NO x x ¥ = reaction SO3 x v X = no reaction Which oxides are neutral oxides? A B Cc D Al203 and NO Al,O3 and SO3 NO only SO3 only

1 marks

Answer: C

This question in 0654/22 May/June 2020

19 Which oxide is a neutral oxide? A CuO, because it reacts with sulfuric acid. B NO, because it is insoluble in acids and alkalis. C SiO2, because it reacts with sodium hydroxide. D SO2, because it dissolves in water.

1 marks

Answer: B

This question in 0654/23 May/June 2020

25 When limestone is heated it thermally decomposes into lime. What is the word equation for this reaction? A calcium carbonate → calcium + carbon dioxide B calcium carbonate → calcium oxide + carbon dioxide C calcium hydrogencarbonate → calcium + carbon dioxide + water D calcium hydrogencarbonate → calcium oxide + carbon dioxide + water

1 marks

Answer: B

This question in 0654/23 May/June 2020

25 What is the chemical name for lime? A calcium carbonate B calcium hydroxide C calcium oxide D calcium sulfate

1 marks

Answer: C

This question in 0654/21 May/June 2021

19 Nitrous oxide, N2O, is a neutral oxide. Which statement about nitrous oxide is correct? A It does not react with acids or with alkalis. B It reacts only with acids. C It reacts only with alkalis. D It reacts with both acids and alkalis.

1 marks

Answer: A

This question in 0654/21 Oct/Nov 2021

20 Zinc oxide reacts with both dilute sulfuric acid and aqueous sodium hydroxide. Which type of oxide is zinc oxide? A acidic B amphoteric C basic D neutral

1 marks

Answer: B

This question in 0654/22 Oct/Nov 2021

26 Which statements about limestone are correct? 1 Limestone is used to neutralise industrial waste products. 2 Limestone is used to treat acidic soil. 3 Thermal decomposition of limestone produces calcium oxide. A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3

1 marks

Answer: D

This question in 0654/23 Oct/Nov 2021

21 A student makes lists of acidic oxides and basic oxides. acidic oxides basic oxides carbon dioxide calcium oxide potassium oxide magnesium oxide nitrogen dioxide sodium oxide phosphorus oxide sulfur dioxide Which oxides are not in the correct list? A carbon dioxide and sodium oxide B potassium oxide and sulfur dioxide C nitrogen dioxide and sulfur dioxide D potassium oxide and calcium oxide

1 marks

Answer: B

This question in 0654/22 Feb/March 2023

24 Equations representing reactions in the Contact process are listed. reaction 1 S + O2  SO2 reaction 2 2SO2 + O2 2SO3 reaction 3 H2SO4 + SO3  H2S2O7 reaction 4 H2S2O7 + H2O  2H2SO4 Which row identifies the reactions that use the stated conditions? requires a requires a requires a vanadium(V) oxide temperature of pressure of catalyst 450 C 2 atmospheres A reaction 2 reaction 1 reaction 4 B reaction 2 reaction 2 reaction 2 C reaction 3 reaction 1 reaction 2 D reaction 3 reaction 2 reaction 4

1 marks

Answer: B

This question in 0654/21 May/June 2023

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 0654/21 May/June 2023

21 The box lists four substances. Br2 CO Cu Na Which substance is an element that forms a basic oxide and coloured compounds? A Br2 B CO C Cu D Na

1 marks

Answer: C

This question in 0654/22 May/June 2023

25 Which statements about limestone are correct? 1 It contains calcium oxide. 2 It is used to manufacture lime. 3 It neutralises acidic industrial waste products. 4 It neutralises alkaline soil. A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

1 marks

Answer: C

This question in 0654/22 May/June 2023

25 When limestone is heated, it decomposes. Which row about limestone and the decomposition is correct? chemical name for limestone decomposition products A calcium carbonate calcium oxide only B calcium carbonate calcium oxide and carbon dioxide C calcium oxide calcium carbonate only D calcium oxide calcium carbonate and carbon dioxide

1 marks

Answer: B

This question in 0654/23 May/June 2023

25 Which equation does not represent a reaction that occurs in the Contact process? A CaO + SO2  CaSO3 B H2S2O7 + H2O  2H2SO4 C 2SO2 + O2  2SO3 D S + O2  SO2

1 marks

Answer: A

This question in 0654/22 Oct/Nov 2023

26 Which word equation describes the manufacture of lime from limestone? A calcium carbonate  calcium hydroxide + carbon dioxide B calcium carbonate  calcium oxide + carbon dioxide C calcium hydroxide  calcium oxide + water D calcium oxide + carbon dioxide  calcium carbonate

1 marks

Answer: B

This question in 0654/22 Oct/Nov 2023

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 0654/22 May/June 2024

19 Chromium(III) oxide reacts with dilute hydrochloric acid and with aqueous sodium hydroxide. Which word describes chromium(III) oxide? A acidic B amphoteric C basic D neutral

1 marks

Answer: B

This question in 0654/23 May/June 2024

25 What is the word equation for the manufacture of lime? A calcium carbonate  calcium hydroxide + carbon dioxide B calcium carbonate  calcium oxide + carbon dioxide C calcium sulfate  calcium hydroxide + sulfur dioxide D calcium sulfate  calcium oxide + sulfur dioxide

1 marks

Answer: B

This question in 0654/22 Oct/Nov 2024

19 Which row describes metallic oxides and non-metallic oxides? metallic oxides non-metallic oxides A acidic acidic B acidic basic C basic acidic D basic basic

1 marks

Answer: C

This question in 0654/22 Feb/March 2025

24 Which statement describes an amphoteric oxide? A It does not react with either sodium hydroxide or hydrochloric acid. B It reacts with sodium hydroxide but not hydrochloric acid. C It reacts with hydrochloric acid but not sodium hydroxide. D It reacts with both sodium hydroxide and hydrochloric acid.

1 marks

Answer: D

This question in 0654/21 May/June 2025

19 Which row describes an element on the left of the Periodic Table and its oxide? type of element type of oxide A metallic basic B non-metallic acidic C metallic acidic D non-metallic basic

1 marks

Answer: A

This question in 0654/22 May/June 2025

18 Sodium is a metal. Silicon is a non-metal. Both sodium and silicon form oxides. Which statement is correct? A Sodium oxide is acidic and silicon dioxide is basic. B Sodium oxide is basic and silicon dioxide is acidic. C Sodium oxide and silicon dioxide are both acidic. D Sodium oxide and silicon dioxide are both basic.

1 marks

Answer: B

This question in 0654/21 Oct/Nov 2025