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5.3 Equilibria

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Question 23

Carbon monoxide reacts reversibly with chlorine in a sealed container.

CO(g)+Cl2(g)⇌COCl2(g) \mathrm{CO(g) + Cl_{2}(g) \rightleftharpoons COCl_{2}(g)} CO(g)+Cl2​(g)⇌COCl2​(g)

Energy is released when carbonyl chloride forms. An equilibrium mixture is cooled while the pressure remains constant.

What happens to the amount of carbon monoxide as equilibrium is re-established?

[1]
A

More carbon monoxide remains, as cooling favours the endothermic direction.

B

Less carbon monoxide remains, as the exothermic forward reaction is favoured.

C

More carbon monoxide remains, as cooling favours the side with more gas molecules.

D

The amount of carbon monoxide is unchanged, as the pressure stays constant.

Markscheme

5.3 Equilibria Questions

  1. GCSE
  2. /Chemistry
  3. /5.3 Equilibria

124 exam-style questions on OCR GCSE Chemistry 5.3 Equilibria, covering 5.3.1 Reversible reactions and dynamic equilibrium and 5.3.2 Changing the position of equilibrium. Each one has a worked solution and a mark scheme showing where the marks go.

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