Chemistry 0620 · IGCSE · Reversible reactions and equilibrium

Reversible reactions and equilibrium — practice question

This reaction has come to equilibrium in a closed system. $\text{2SO}_2(g) + \text{O}_2(g) \rightleftharpoons \text{2SO}_3(g)$ The forward reaction releases heat. Which row indicates the effect of raising the pressure on the equilibrium mixture?

  • Areaction rate increases, amount of $\text{SO}_2$ decreases, amount of $\text{SO}_3$ increases
  • Breaction rate increases, amount of $\text{SO}_2$ increases, amount of $\text{SO}_3$ decreases
  • Creaction rate unchanged, amount of $\text{SO}_2$ decreases, amount of $\text{SO}_3$ increases
  • Dreaction rate unchanged, amount of $\text{SO}_2$ increases, amount of $\text{SO}_3$ decreases

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