Question

Consider the reaction equilibrium:

On the basis of Le Chatelier's principle, the condition favourable for the forward reaction is
(a) lowering of temperature as well as pressure
(b) increasing temperature as well as pressure
(c) lowering the temperature and increasing the pressure
(d) any value of temperature and pressure.

Answer 1

(c) : The conversion of SO₂ to SO₃ is an exothermic reaction, hence decrease the temperature will favour the forward reaction. There is also a decrease in volume or moles in product side. Thus the reaction
is favoured by low temperature and high pressure.
(LeChatelier's principle).