Chemistry · May / June 2023 · Paper 11 · Question 15

The equation for a reaction in the Contact process is shown. $2SO_2(g) + O_2(g) \rightleftharpoons 2SO_3(g)$ $\Delta H = -197\ \text{kJ} / \text{mol}$ The conditions used are 450 °C, 2 atmospheres pressure and a catalyst. What will be the effects when the temperature is reduced to 250 °C and the catalyst is removed?

1. Adecrease / no change
2. Bdecrease / decrease
3. Cincrease / increase
4. Dincrease / decrease

As printed in the paper