O-LevelChemistryRates of Reaction5070/11 · Oct/Nov 2015 · Q131 Mark

Which change is endothermic?

ACH4(g) + 2O2(g) → CO2(g) + 2H2O(l)

BH(g) + Cl(g) → HCl(g)

CH2O(g) → 2H(g) + O(g)

DH2O(l) → H2O(s)

✓ Correct answer

C: H2O(g) → 2H(g) + O(g)

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Topic: Rates of Reaction, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2015 Paper 1 Variant 1, question 13.

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