NaCl is non-volatile but HCl is volatile-explainwith reason.

Explanation

The volatility of a compound depends on its boiling point which in turn depends on the intermolecular attractive forces. The only attractive force that operates among the polar covalent HCl molecules is dipole-dipole attraction. Since this attactive force is relatively weak, the boiling point of HCl is low and it is volatile (at ordinary temperature, it is a gas). on the other hand, inthe electrovalent compound NaCl, the oppositely charged `Na^(+) and Cl^(-)` ions are held together by strong electrostatic forces of attraction in the crystal lattice and because ofthis, at ordinary temperature NaCl is an non-volatile solid.