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6.2 Organic chemistry

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Question 25
H

A hydrogen/oxygen fuel cell has an acidic electrolyte. Hydrogen gas is supplied to the negative electrode.

Which half equation shows the reaction at the negative electrode?

[1]
A

H2→2H++2e−\mathrm{H_{2}\rightarrow 2H^{+}+2e^{-}}H2​→2H++2e−

B

O2+4H++4e−→2H2O\mathrm{O_{2}+4H^{+}+4e^{-}\rightarrow 2H_{2}O}O2​+4H++4e−→2H2​O

C

2H++2e−→H2\mathrm{2H^{+}+2e^{-}\rightarrow H_{2}}2H++2e−→H2​

D

H2+2e−→2H+\mathrm{H_{2}+2e^{-}\rightarrow 2H^{+}}H2​+2e−→2H+

Markscheme

6.2 Organic chemistry Questions

  1. GCSE
  2. /Chemistry
  3. /6.2 Organic chemistry

63 exam-style questions on OCR GCSE Chemistry 6.2 Organic chemistry, covering 6.2.1 Crude oil and fractional distillation, 6.2.2 Cracking and dependence on hydrocarbons, 6.2.3 Functional groups and homologous series, 6.2.4 Reactions of alkanes, alkenes and alcohols, 6.2.5 Addition polymerisation and repeat units, 6.2.6 Naturally occurring polymers, 6.2.7 Chemical cells and fuel cells, and 6.2.8 Condensation polymerisation and how to make one. Each one has a worked solution and a mark scheme showing where the marks go.

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