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Question: Consider the reaction equilibrium 2SO2 (g) + O2 (g) \(\rightleftharpoons\) 2SO3 (g) ;DH<sup>0</sup...

Consider the reaction equilibrium

2SO2 (g) + O2 (g) ⇌\rightleftharpoons 2SO3 (g) ;DH0 = – 198 kJ.

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

Lowering the temperature and increasing the pressure

Explanation

Solution

The conversion of SO2 to SO3 is an exothermic reaction, hence there is no need to increase the temperature. There is also a decrease in volume or moles in product side. Thus the reaction is favoured by low temperature and high pressure. (Le-Chatelier’s principle)