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5.3 Equilibria

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Question 18

Carbon monoxide and chlorine form carbonyl chloride in a reversible reaction.

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

Formation of carbonyl chloride is exothermic.

The reaction mixture has reached equilibrium.

Which pair of changes would each decrease the equilibrium yield of carbonyl chloride?

[1]
A

Increasing the temperature and decreasing the pressure

B

Decreasing the temperature and increasing the pressure

C

Decreasing the temperature and decreasing the pressure

D

Increasing the temperature and increasing the pressure

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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