O-LevelChemistryRates of Reaction5070/11 · May/June 2022 · Q181 Mark

For the forward reaction of a reversible reaction, the enthalpy change of reaction, ΔH, is –50 kJ/mol and the activation energy, Ea, is +60 kJ/mol. What is the activation energy of the reverse reaction?

A–110 kJ/mol

B–10 kJ/mol

C+10 kJ/mol

D+110 kJ/mol

✓ Correct answer

D: +110 kJ/mol

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Topic: Rates of Reaction, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2022 Paper 1 Variant 1, question 18.

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