Question

Which one of the following gases cannot be dried by passing though concentrated sulphuric acid?

• A. ${CO}_2$
• B. $H_2$
• C. $O_2$
• D. ${NH}_3$

Answer 1

The correct option is D ${NH}_3$

Ammonia is basic. So, it reacts with sulphuric acid to form ammonium sulphate so it cannot be dried up using sulphuric acid. The reaction is as follows :

$2N{H}_3+H_{2}S{O}_4\to {\left(N{H}_4\right)}_{2}S{O}_4$