Question

In the laboratory preparation of nitric acid, nitre is heated with ______.

Options

• conc. HCl

• conc. H₂SO₄

• dil. H₂SO₄

• conc. H₃PO₄

Answer 1

In the laboratory preparation of nitric acid, nitre is heated with `bbunderline(conc. H_2SO_4)`.

Explanation:

In the laboratory preparation of nitric acid, nitre (KNO₃) is heated with concentrated sulphuric acid. Since sulphuric acid is less volatile, it displaces nitric acid from the nitrate salt.

\[\ce{KNO3 + H2SO4(conc.) -> KHSO4 + HNO3}\]