Question

The oxidation of SO₂ to SO₃ is an exothermic reaction. The yield of SO₃ will be maximum if:

• A. Temperature is increased and pressure is kept constant
• B. Temperature is reduced and pressure is increased
• C. Both temperature and pressure are increased
• D. Both temperature and pressure are reduced

Answer 1

Answer: (B)

$\text{SO}_{2} + \frac{1}{2} \text{O}_{2} \rightleftharpoons \text{SO}_{3} \text{;} \Delta \text{H} = - \text{ve ;}$
Apply Le Chatelier principle.