Question

Predict the effect of increased pressure on the following reaction equilibrium,
$2 SO _{2(g)}+ O _{2(g)} \rightleftharpoons 2 SO _{3(g)}$

• A. Equilibrium shift to the right
• B. Equilibrium shift to the left
• C. No effect on equilibrium
• D. Reaction stops

Answer 1

Answer: (A)

$2 SO _{2}(g)+ O _{2}(g) 2 SO _{3}(g)$
Here, $\Delta n_{g}=2-(2+1)=-1$
Therefore, according to Le-Chateliers principle, i the increase in pressure favours forward reaction,
i.e., equilibrium will be shift to the right,