Give equations for formation of two different acids from conc. H₂SO₄. State the property of sulphuric acid involved in the above formation.

$\text{NaNO}$3 + \text{H}2\text{SO}4 [\text{conc.}]\xrightarrow{\lt 200 \degree\text{C}} \text{NaHSO}\text{4} + \text{HNO}_3

$\text{NaCl} + \text{H}$2\text{SO}4 [\text{conc.}]\xrightarrow{\lt 200 \degree\text{C}} \text{NaHSO}_\text{4} + \text{HCl}

The property of being a non-volatile acid is used in the above reactions.