O-LevelChemistryRates of Reaction5070/11 · Oct/Nov 2018 · Q151 Mark

The equation represents the reaction between two gases, X₂ and Y₂, to form compound XY. X₂(g) + Y₂(g) ⇌ 2XY(g) The energy profile diagram for the reaction is shown. Which statement about this reaction is correct?

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

AThe activation energy for the reaction is equal to E.

BThe enthalpy change for the reaction is equal to E.

CThe reaction is exothermic.

DThe total energy needed to break bonds is greater than the total energy needed to form bonds.

✓ Correct answer

C: The reaction is exothermic.

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Topic: Rates of Reaction, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2018 Paper 1 Variant 1, question 15.

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