Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
The electrolysis of other molten substances
19 practice questions
Practice questions
1–3 of 3 · Hard
Question 1
2 marks · Hard
Answer and see the solution →Balance the following ionic half-equation for the electrolysis of a molten ionic compound, so that both the number of atoms and the charges are equal on both sides:
where M represents a generic metal.
Question 2
5 marks · Hard
Answer and see the solution →A molten ionic compound XY is electrolysed using inert electrodes.
(a)[2 marks]State which element is produced at the cathode. Explain your answer.
(b)[2 marks]State which element is produced at the anode. Explain your answer.
(c)[1 mark]Give one reason why these predictions are valid only for molten binary ionic compounds, not aqueous ones.
Question 3
2 marks · Hard
Answer and see the solution →Write the ionic half-equation for the reaction that occurs at the cathode during the electrolysis of molten magnesium oxide (MgO).