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.