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Leaving Cert Physics & Chemistry: Electrolysis & Faraday's laws

How often Electrolysis & Faraday's laws comes up on the Physics & Chemistry papers, every year it was asked, and questions to try.

HL Asked on 9 of the last 9 Higher Level papers, most recently in 2025. banker

OL Asked on 9 of the last 9 Ordinary Level papers, most recently in 2025. banker

Electrolysis & Faraday's laws, Higher Level(7 marks)

Quick ones on Electrolysis & Faraday's laws.

(a)In electrolysis, what happens at the anode?
  1. Reduction
  2. Oxidation
  3. Neutralisation
(b)Acidified water is electrolysed in a Hofmann voltameter. Volume ratio of hydrogen to oxygen?
  1. 1 : 1
  2. 1 : 2
  3. 2 : 1
(c)How many faradays of charge are needed to deposit 1 mole of aluminium from Al3+ ions?
  1. 3
  2. 2
  3. 1
Show the answers

(a) Oxidation

(b) 2 : 1

(c) 3

Your turn: Higher Level questions on Electrolysis & Faraday's laws.

Higher Level

Asked on 9 of the last 9 Higher Level papers, most recently in 2025. banker

Every paper, year by year

YearWhere it came up
2025Q7(k), Q10
2024Q10
2023Q10
2022Q7(k), Q10
2021Q10
2019Q10
2018Q10
2017Q10
2016Q10

Links open the State Examinations Commission’s paper for that year.

Ordinary Level

Asked on 9 of the last 9 Ordinary Level papers, most recently in 2025. banker

Every paper, year by year

YearWhere it came up
2025Q9
2024Q7(n)
2023Q7(k), Q12(b)
2022Q9
2021Q7(o)
2019Q7(j)
2018Q9
2017Q7(n)
2016Q7(m)

Links open the State Examinations Commission’s paper for that year.

More Electrolysis & Faraday's laws questions

Electrolysis & Faraday's laws, 2 marks

Electrolysis is?

  1. Using a chemical reaction to make an electric current flow
  2. Splitting a nucleus by firing slow neutrons at it
  3. Using an electric current to cause a chemical reaction
Show the answer

Using an electric current to cause a chemical reaction

Current passes through a molten or dissolved ionic compound. A reaction that makes a current is an electrochemical cell, the reverse process.

Electrolysis & Faraday's laws, 2 marks

At which electrode does oxidation happen in electrolysis?

  1. Both equally
  2. Anode
  3. Cathode
Show the answer

Anode

Negative ions go to the positive anode and lose electrons there (oxidation). Reduction always happens at the cathode.

Electrolysis & Faraday's laws, 3 marks

Electrolysis of acidified water: ratio of hydrogen volume to oxygen volume?

  1. 2 to 1
  2. 1 to 1
  3. 1 to 2
Show the answer

2 to 1

Water is H2O, with twice as many H as O atoms, so twice as much hydrogen gas forms. In a Hofmann voltameter the H2 collects at the cathode.

Other Physics & Chemistry topics

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