Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Electrolysis and redox
19 practice questions
Practice questions
1–3 of 3 · Hard
Question 1
2 marks · Hard
Answer and see the solution →Define oxidation and reduction in terms of electron transfer. Give your answers using complete sentences.
Question 2
5 marks · Hard
Answer and see the solution →The apparatus below is used to electrolyse molten tin(II) chloride (SnCl₂). Tin(II) ions (Sn²⁺) and chloride ions (Cl⁻) move towards the electrodes and react.
Electrolysis setup for molten tin(II) chloride (a) State what is meant by 'discharging' a tin(II) ion during the electrolysis of molten tin(II) chloride.
(a)[2 marks]State what is meant by 'discharging' a tin(II) ion during the electrolysis of molten tin(II) chloride.
(b)[2 marks]Explain, in terms of electron transfer, what happens to a tin(II) ion at the cathode in this process.
(c)[1 mark]Write a half-equation for the reaction involving tin(II) ions at the cathode.
Question 3
2 marks · Hard
Answer and see the solution →The electrolysis of molten iron(III) chloride (FeCl₃) involves reactions at both electrodes.
State which electrode reaction involves oxidation, and which involves reduction. Explain your answer with reference to loss or gain of electrons.