Question

In the atmosphere, the conversion of $S{O}_2$ to $S{O}_3$ is a favourable reaction and it contributes to acid rain. But, in industry, a catalyst is essential for the process. Give reason.

Answer 1

$2S{O}_2+O_2\to 2S{O}_3$

This reaction occurs at high temperatures in the atmosphere. But in industries, we must choose cost efficient process. So to not use high temperatures, we use $V_2{O}_5$ catalyst for the reaction.