Corrosion of metals — Paper 2 · IGCSE Sciences - Co-ordinated (Double) 0654

24 The diagram shows an experiment about the rusting of iron. iron air test-tube water level at beginning of experiment water The apparatus is left for one week. After one week the water level has risen up the test-tube by ««1«« because the ««2«« in the air reacts with the iron. Which row completes gaps 1 and 2? 1 2 A 20% nitrogen B 20% oxygen C 79% nitrogen D 79% oxygen

1 marks

Answer: B

This question in 0654/22 May/June 2017

22 Underwater pipes made from steel are prevented from rusting by sacrificial protection. Sacrificial protection uses a ««1«« reactive metal attached to the pipes which is ««2«« in preference to the steel. Which words complete gaps 1 and 2? 1 2 A less oxidised B less reduced C more oxidised D more reduced

1 marks

Answer: C

This question in 0654/23 Oct/Nov 2017

24 The diagram shows gas P being passed through liquid X and over iron filings. gas P iron filings liquid X Which gas and liquid cause the iron to rust? gas P liquid X A nitrogen concentrated sulfuric acid (a drying agent) B nitrogen water C oxygen concentrated sulfuric acid (a drying agent) D oxygen water

1 marks

Answer: D

This question in 0654/21 Oct/Nov 2018

24 The diagram shows gas P being passed through liquid X and over iron filings. gas P iron filings liquid X Which gas and liquid cause the iron to rust? gas P liquid X A nitrogen concentrated sulfuric acid (a drying agent) B nitrogen water C oxygen concentrated sulfuric acid (a drying agent) D oxygen water

1 marks

Answer: D

This question in 0654/22 Oct/Nov 2018

22 A block of zinc is attached to an underground steel pipe as shown. zinc block steel pipe The zinc stops the steel rusting by sacrificial protection. Which statement does not explain how sacrificial protection works? A Zinc is more reactive than the iron in steel. B Zinc is oxidised in preference to the iron in steel. C Zinc prevents oxygen from reaching the steel. D Zinc transfers electrons to the iron in the steel.

1 marks

Answer: C

This question in 0654/23 Oct/Nov 2018

24 The diagram shows gas P being passed through liquid X and over iron filings. gas P iron filings liquid X Which gas and liquid cause the iron to rust? gas P liquid X A nitrogen concentrated sulfuric acid (a drying agent) B nitrogen water C oxygen concentrated sulfuric acid (a drying agent) D oxygen water

1 marks

Answer: D

This question in 0654/23 Oct/Nov 2018

23 Some properties of aluminium are listed. 1 conducts electricity 2 malleable 3 resistant to corrosion Which properties make aluminium suitable for use as food containers? A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: D

This question in 0654/21 May/June 2019

25 Four properties of metals are listed. 1 high melting point 2 low density 3 resistance to corrosion 4 conducts electricity Which properties make aluminium suitable for use in cans containing drinks? 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 Oct/Nov 2019

23 Which statement is not a reason why aluminium is used in aircraft manufacture? A It forms low density alloys. B It is malleable. C It is more reactive than iron. D It is resistant to corrosion.

1 marks

Answer: C

This question in 0654/21 May/June 2020

23 Which statement is not a reason why aluminium is used in aircraft manufacture? A It forms low density alloys. B It is malleable. C It is more reactive than iron. D It is resistant to corrosion.

1 marks

Answer: C

This question in 0654/22 May/June 2020

22 A block of zinc is attached to an underground steel pipe as shown. zinc block steel pipe The zinc stops the steel rusting by sacrificial protection. Which statement is not correct? A Zinc is more reactive than the iron in steel. B Zinc is oxidised in preference to the iron in steel. C Zinc prevents oxygen from reaching the steel. D Zinc transfers electrons to the iron in the steel.

1 marks

Answer: C

This question in 0654/21 Oct/Nov 2021

23 A block of zinc is attached to an underground steel pipe as shown. zinc block steel pipe The zinc stops the steel rusting by sacrificial protection. Which statement is not correct? A Zinc is more reactive than the iron in steel. B Zinc is oxidised in preference to the iron in steel. C Zinc prevents oxygen from reaching the steel. D Zinc transfers electrons to the iron in the steel.

1 marks

Answer: C

This question in 0654/22 Oct/Nov 2021

23 A block of zinc is attached to an underground steel pipe as shown. zinc block steel pipe The zinc stops the steel rusting by sacrificial protection. Which statement is not correct? A Zinc is more reactive than the iron in steel. B Zinc is oxidised in preference to the iron in steel. C Zinc prevents oxygen from reaching the steel. D Zinc transfers electrons to the iron in the steel.

1 marks

Answer: C

This question in 0654/23 Oct/Nov 2021

23 A piece of iron is coated with a layer of zinc. Which statement explains why zinc prevents iron from rusting, even when the layer of zinc is damaged? A Iron is less reactive than zinc and zinc atoms lose electrons less easily than iron atoms. B Iron is less reactive than zinc and zinc atoms lose electrons more easily than iron atoms. C Iron is more reactive than zinc and zinc atoms lose electrons less easily than iron atoms. D Iron is more reactive than zinc and zinc atoms lose electrons more easily than iron atoms.

1 marks

Answer: B

This question in 0654/21 May/June 2022

23 Zinc is used to galvanise iron. Which statements about galvanising are correct? 1 Iron is more reactive than zinc. 2 Zinc oxidises instead of iron. 3 Galvanised iron rusts if the zinc coating is scratched. 4 Galvanising iron is an example of sacrificial protection. A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

1 marks

Answer: C

This question in 0654/23 May/June 2022

24 When iron is galvanised, it is coated with a layer of zinc. Which statements about galvanising are correct? 1 Zinc has a greater tendency to form positive ions than iron. 2 Zinc prevents iron from rusting by sacrificial protection. 3 Iron is more reactive than zinc. 4 Zinc acts as a barrier method of rust prevention if scratched. A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

1 marks

Answer: A

This question in 0654/23 Oct/Nov 2024

22 Which statements explain why zinc is used to galvanise steel? 1 It is less reactive than steel. 2 It forms an alloy with steel. 3 It prevents air and water coming into contact with steel. 4 It provides sacrificial protection for the steel. A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

1 marks

Answer: D

This question in 0654/22 Feb/March 2025