Hydrogen iodide gas can undergo reversible decomposition to form iodine vapour and hydrogen. $2\text{HI}(g) \rightleftharpoons \text{I}_2(g) + \text{H}_2(g) \quad \Delta H = +12\,\text{kJ mol}^{-1}$ The equilibrium position for this reaction can be changed by altering the external conditions. Which row correctly states the shift in equilibrium position?
- Apressure increase: moves to the right; temperature increase: moves to the right
- Bpressure increase: moves to the right; temperature increase: moves to the left
- Cpressure increase: no change; temperature increase: moves to the right
- Dpressure increase: no change; temperature increase: moves to the left