What happen when a mixture of sand and ammonium chloride is heated?

Sublimation is used to separate a mixture of sand and ammonium chloride. Sublimation is a separation process that entails heating a mixture of solids, where one of the solids transitions from solid to gas without passing through the liquid state ... This process leaves behind the sand in its natural state.

When a mixture of sand and ammonium chloride is heated, the ammonium chloride sublimates out and sand is left behind.

Explanation:

Sublimation is the process in which, a substance directly goes into its gaseous state, without passing through the liquid state, on heating.