Hydrogen–oxygen fuel cells — Paper 2 · IGCSE Chemistry (9-1) 0971

11 Which statement about the hydrogen fuel cell is not correct? A Chemical energy is converted into electrical energy. B Hydrogen is oxidised. C The reaction that takes place is endothermic. D Water is the only product.

1 marks

Answer: C

This question in 0971/21 May/June 2019

14 Which gases are used to generate electricity in a fuel cell? A carbon dioxide and oxygen B hydrogen and methane C hydrogen and oxygen D methane and carbon dioxide

1 marks

Answer: C

This question in 0971/22 Oct/Nov 2019

13 Which statements about hydrogen fuel cells are correct? 1 Water is formed as the only waste product. 2 Both water and carbon dioxide are formed as waste products. 3 The overall reaction is 2H2 + O2 → 2H2O. 4 The overall reaction is endothermic. A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

1 marks

Answer: A

This question in 0971/21 May/June 2020

13 Which statements about hydrogen fuel cells are correct? 1 Water is formed as the only waste product. 2 Both water and carbon dioxide are formed as waste products. 3 The overall reaction is 2H2 + O2 → 2H2O. 4 The overall reaction is endothermic. A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

1 marks

Answer: A

This question in 0971/22 May/June 2020

13 Which equation represents a reaction that takes place in a fuel cell? A C + O2  CO2 B 2H2 + O2  2H2O C CH4 + 2O2  CO2 + 2H2O D C3H8 + 5O2  3CO2 + 4H2O

1 marks

Answer: B

This question in 0971/21 May/June 2021

14 Which statements about hydrogen are correct? 1 When hydrogen is burned, heat energy is released. 2 When hydrogen is used in a fuel cell, electrical energy is generated. 3 When hydrogen is used as a fuel, water is the only product. A 1, 2 and 3 B 1 and 2 only C 1 only D 3 only

1 marks

Answer: A

This question in 0971/22 Oct/Nov 2021

17 When a hydrogen–oxygen fuel cell is in operation, a different reaction happens at each electrode. at the hydrogen electrode H2  2H+ + 2e– at the oxygen electrode O2 + 2H2O + 4e–  4OH– The electrons that are lost at the hydrogen electrode travel through the external circuit to the oxygen electrode, where they are gained by the oxygen and water. A hydrogen–oxygen fuel cell is operated for a period of time and four moles of oxygen molecules are consumed. Which mass of hydrogen is consumed? A 2.0 g B 4.0 g C 8.0 g D 16.0 g

1 marks

Answer: D

This question in 0971/22 May/June 2022

10 Which statements about hydrogen fuel cells are correct? 1 Water is formed as the only waste product. 2 Both water and carbon dioxide are formed as waste products. 3 The overall reaction is 2H2 + O2 → 2H2O. 4 The overall reaction is endothermic. A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

1 marks

Answer: A

This question in 0971/21 May/June 2023

12 Hydrogen–oxygen fuel cells can be used to power vehicles. Which statement about hydrogen–oxygen fuel cells is correct? A The equation for the overall reaction is H2 + O2  H2O2. B The only chemical products are water and carbon dioxide. C Chemical energy in the fuel is converted into electrical energy. D The hydrogen used in hydrogen–oxygen fuel cells is a fossil fuel.

1 marks

Answer: C

This question in 0971/22 May/June 2025

12 Hydrogen–oxygen fuel cells are used in electric cars. Three statements about these fuel cells are listed. 1 The process in the cell is called electrolysis. 2 Water is broken down in the cell to produce hydrogen, oxygen and electricity. 3 Water is the only chemical product formed in the reaction. Which statements are correct? A 1 and 2 B 1 and 3 C 2 only D 3 only

1 marks

Answer: D

This question in 0971/22 Oct/Nov 2025