Chemistry · Oct / Nov 2019 · Paper 11 · Question 22

Sulfuric acid is manufactured using the contact process. The equations for the reactions in the process are shown. reaction 1 2SO2(g) + O2(g) ⇌ 2SO3(g) ΔH = –198 kJ / mol reaction 2 SO3(g) + H2O(l) → H2SO4(aq) Which statements are correct? 1 Reaction 1 is reversible. 2 Reaction 1 is exothermic. 3 In reaction 2, sulfur dioxide reacts with water to form sulfuric acid.

1. A1 and 2 only
2. B1 and 3 only
3. C2 and 3 only
4. D1, 2 and 3

As printed in the paper