Chemistry 9701 · AS & A Level · Equilibria

Equilibria — practice question

Which is the correct expression for $K_c$ for the reaction shown? $\text{I}_2(aq) + 2\text{Fe}^{2+}(aq) \rightleftharpoons 2\text{I}^-(aq) + 2\text{Fe}^{3+}(aq)$

  • A$\frac{[2\text{I}^-][2\text{Fe}^{3+}]}{[\text{I}_2][2\text{Fe}^{2+}]}$
  • B$\frac{[\text{I}^-]^2[\text{Fe}^{3+}]^2}{[\text{I}_2][\text{Fe}^{2+}]^2}$
  • C$\frac{[\text{I}_2][2\text{Fe}^{2+}]}{[2\text{I}^-][2\text{Fe}^{3+}]}$
  • D$\frac{[\text{I}_2][\text{Fe}^{2+}]^2}{[\text{I}^-]^2[\text{Fe}^{3+}]^2}$

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