Question

______ is obtained by distilling conc. sulphuric acid with potassium nitrate.

• A. Hydrochloric acid
• B. Phosphoric acid
• C. Nitric acid
• D. Perchloric acid

Answer 1

The correct option is C

Nitric acid

A mixture of equal parts, by weight, of potassium nitrate and concentrated sulphuric acid is heated gently to ${180}^{0}C-{200}^{0}C$ in a glass retort. Sulphuric acid is a non-volatile acid and produces volatile nitric acid on reacting with potassium nitrate.

$KN{O}_3+\underset{Conc.}{H_{2}S{O}_4}\stackrel{<{200}^{0}C}{\to }KHS{O}_4+HN{O}_3$