Chemistry 0620 · IGCSE · Reversible reactions and equilibrium

Reversible reactions and equilibrium — practice question

Within the Contact process, sulfur dioxide is changed into sulfur trioxide. $2\text{SO}_2(g) + \text{O}_2(g) \rightleftharpoons 2\text{SO}_3(g)$. What effect does a decrease in pressure have on the rate at which sulfur trioxide forms and on the percentage yield of sulfur trioxide at equilibrium?

  • Arate of formation decreases, percentage yield decreases
  • Brate of formation decreases, percentage yield increases
  • Crate of formation increases, percentage yield decreases
  • Drate of formation increases, percentage yield increases

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