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Chemistry · May / June 2021 · Paper 12 · Question 21

5070Reversible reactions and equilibrium

Brown nitrogen dioxide reacts to form colourless dinitrogen tetroxide in a reversible reaction. The forward reaction is exothermic. 2NO2(g) ⇌ N2O4(g) brown colourless Which changes would make the equilibrium mixture darker in colour?

  1. Atemperature decrease, pressure decrease
  2. Btemperature decrease, pressure increase
  3. Ctemperature increase, pressure decrease
  4. Dtemperature increase, pressure increase

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Correct answer: C. temperature increase, pressure decrease

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