O-LevelChemistryRates of Reaction5070/11 · May/June 2019 · Q191 Mark

The equations show four reversible reactions. For which reaction would the equilibrium move to the right for both an increase in pressure and an increase in temperature?

Areaction: H₂(g) + I₂(g) ⇌ 2HI(g), enthalpy change: exothermic

Breaction: 4NO(g) + 6H₂O(g) ⇌ 4NH₃(g) + 5O₂(g), enthalpy change: endothermic

Creaction: PCl₅(g) ⇌ PCl₃(g) + Cl₂(g), enthalpy change: endothermic

Dreaction: 2SO₂(g) + O₂(g) ⇌ 2SO₃(g), enthalpy change: exothermic

✓ Correct answer

B: reaction: 4NO(g) + 6H₂O(g) ⇌ 4NH₃(g) + 5O₂(g), enthalpy change: endothermic

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Topic: Rates of Reaction, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2019 Paper 1 Variant 1, question 19.

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