Question

In the following reversible reaction $2S{O}_2+O_2\rightleftharpoons 2S{O}_3+QCal$

Most suitable condition for the higher production of $S{O}_3$ is

• A. High temperature and high pressure
• B. High temperature and low pressure
• C. Low temperature and high pressure
• D. Low temperature and low pressure

Answer 1

The correct option is C Low temperature and high pressure

Reaction is exothermic and volume is decreasing from left to right (i.e $\Delta n<0$).To increase the production of $S{O}_3$, temperature can be lowered and pressure can be increased.
Remember, the temperature effect increases the equilibrium constant value and the pressure effect shifts the equilibrium towards the right. Both of these would increase the production of sulphur trioxide.