Question

Why Aluminium chloride substance on heating directly coverts into vapour form??​

Answer 1

Explanation:

Sublimation is the transition of a substance directly from the solid to the gas state, ... For example, the dissociation on heating of solid ammonium chloride into hydrogen chloride and ...

Answer 2

At room temperature, solid aluminum chloride has an ionic lattice with significant of covalent character. At temperatures around 180 - 190°C (depending on the pressure), aluminum chloride coverts to its molecular form, Al2Cl6. This causes it to melt or vaporize due to comparatively weak intermolecular attractions.