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Electrolysis

Electrolysis

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Question 10

A hydrogen-oxygen fuel cell with an acidic electrolyte produces electricity.

Hydrogen reacts with oxygen to produce water.

What is the equation for the reaction that happens at the cathode?

A

2H2(g)+O2(g)→2H2O(g)2\text{H}_2(\text{g}) + \text{O}_2(\text{g}) \rightarrow 2\text{H}_2\text{O}(\text{g})2H2​(g)+O2​(g)→2H2​O(g)

B

2H2(g)→4H+(aq)+4e−2\text{H}_2(\text{g}) \rightarrow 4\text{H}^+(\text{aq}) + 4\text{e}^-2H2​(g)→4H+(aq)+4e−

C

O2(g)+4H+(aq)+4e−→2H2O(g)\text{O}_2(\text{g}) + 4\text{H}^+(\text{aq}) + 4\text{e}^- \rightarrow 2\text{H}_2\text{O}(\text{g})O2​(g)+4H+(aq)+4e−→2H2​O(g)

D

4H+(aq)+4e−→2H2(g)4\text{H}^+(\text{aq}) + 4\text{e}^- \rightarrow 2\text{H}_2(\text{g})4H+(aq)+4e−→2H2​(g)

Markscheme

Electrolysis Questions

  1. GCSE
  2. /Chemistry
  3. /Electrolysis

34 exam-style questions on OCR GCSE Chemistry Electrolysis. Each one has a worked solution and a mark scheme showing where the marks go.

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