Skip to content

Course home

Sign up

3.4 Electrolysis

EasyMediumHard
1234567891011121314151617181920
Question 4
H

Zinc chloride, ZnCl₂, is an ionic compound. It melts at 290 °C.

A student electrolyses molten zinc chloride using graphite electrodes.

a.

Explain why zinc chloride must be molten before it can be electrolysed.

[2]
b.i.

Write the half equations for the reactions at the electrodes.

Cathode

[2]
b.ii.

Anode

[2]
c.

Which ions are oxidised during the electrolysis?

Explain your answer.

[2]
d.

Another student says:

"Electrons flow through the molten zinc chloride from one electrode to the other."

Explain why this student is wrong. Describe how the charge is carried through the molten zinc chloride.

[2]
Markscheme

3.4 Electrolysis Questions

  1. GCSE
  2. /Chemistry
  3. /3.4 Electrolysis

52 exam-style questions on OCR GCSE Chemistry 3.4 Electrolysis, covering 3.4.1 Products formed at the electrodes in electrolysis and 3.4.2 The technique of electrolysis. Each one has a worked solution and a mark scheme showing where the marks go.

Question bank