O-LevelChemistryRates of Reaction5070/12 · May/June 2016 · Q141 Mark

Ammonia can be produced industrially from nitrogen and hydrogen. N2(g) + 3H2(g) ⇌ 2NH3(g) The forward reaction is exothermic. Which change would not alter the yield of ammonia?

Aadding a catalyst

Bdecreasing the pressure

Cdecreasing the temperature

Dremoving some ammonia during the reaction

✓ Correct answer

A: adding a catalyst

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Topic: Rates of Reaction, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2016 Paper 1 Variant 2, question 14.

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