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5.3 Equilibria

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Question 23
H

Phosphorus pentachloride breaks down into phosphorus trichloride and chlorine.

PCl5(g)⇌PCl3(g)+Cl2(g) \mathrm{PCl_{5}(g) \rightleftharpoons PCl_{3}(g) + Cl_{2}(g)} PCl5​(g)⇌PCl3​(g)+Cl2​(g)

The forward reaction is endothermic.

Which change will increase both the rate of the reaction and the yield of chlorine at equilibrium?

[1]
A

Increasing the pressure

B

Increasing the temperature

C

Adding a catalyst

D

Decreasing the temperature

Markscheme

5.3 Equilibria Questions

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

47 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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