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Chemical equilibrium

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Question 7

Carbonyl chloride (phosgene) decomposes into carbon monoxide and chlorine at high temperatures according to the following equilibrium:

COCl2(g)⇌CO(g)+Cl2(g)ΔH=+108 kJ mol−1 \text{COCl}_2(\text{g}) \rightleftharpoons \text{CO}(\text{g}) + \text{Cl}_2(\text{g}) \quad \Delta H = +108 \text{ kJ mol}^{-1} COCl2​(g)⇌CO(g)+Cl2​(g)ΔH=+108 kJ mol−1 colorless gascolorless gaspale green gas \text{colorless gas} \quad\quad\quad\quad\quad \text{colorless gas} \quad\quad\quad \text{pale green gas} colorless gascolorless gaspale green gas

Which statement(s) is/are correct?

  1. The decomposition of carbonyl chloride has a positive entropy change.
  2. Increasing the temperature of the equilibrium mixture causes the pale green colour to fade.
  3. The oxidation state of carbon changes during the reaction.
A

1, 2 and 3

B

Only 1 and 2

C

Only 1 and 3

D

Only 3

Markscheme

Chemical equilibrium Questions

  1. A Level
  2. /Chemistry
  3. /Chemical equilibrium

23 exam-style questions on OCR A A Level Chemistry Chemical equilibrium. Each one has a worked solution and a mark scheme showing where the marks go.

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