Skip to content

Course home

Sign up

4.3 Electrolysis

EasyMediumHard
1234567891011121314151617181920212223242526272829
Question 27
H

Molten potassium chloride and potassium chloride solution are electrolysed. Which row gives the two negative electrode half equations?

[1]
A

Molten K++e−→K\text{K}^+ + \text{e}^- \rightarrow \text{K}K++e−→K, solution K++e−→K\text{K}^+ + \text{e}^- \rightarrow \text{K}K++e−→K

B

Molten 2H++2e−→H22\text{H}^+ + 2\text{e}^- \rightarrow \text{H}_22H++2e−→H2​, solution K++e−→K\text{K}^+ + \text{e}^- \rightarrow \text{K}K++e−→K

C

Molten 2H++2e−→H22\text{H}^+ + 2\text{e}^- \rightarrow \text{H}_22H++2e−→H2​, solution 2H++2e−→H22\text{H}^+ + 2\text{e}^- \rightarrow \text{H}_22H++2e−→H2​

D

Molten K++e−→K\text{K}^+ + \text{e}^- \rightarrow \text{K}K++e−→K, solution 2H++2e−→H22\text{H}^+ + 2\text{e}^- \rightarrow \text{H}_22H++2e−→H2​

Markscheme

4.3 Electrolysis Questions

  1. GCSE
  2. /Chemistry
  3. /4.3 Electrolysis

40 exam-style questions on AQA GCSE Chemistry 4.3 Electrolysis, covering 4.3.1a The process of electrolysis, 4.3.1b Half equations in electrolysis, 4.3.2 Electrolysis of molten ionic compounds, 4.3.3 Using electrolysis to extract metals, 4.3.4 Electrolysis of aqueous solutions, and 4.3.5 Representation of reactions at electrodes as half equations. Each one has a worked solution and a mark scheme showing where the marks go.

Question bank