Question

The colour of chromyl chloride vapours is ______.

Answer 1

The colour of chromyl chloride vapours is orange-red.

Explanation:

Chromyl chloride (CrO₂Cl₂) forms orange-red, oily vapours when potassium dichromate is heated with concentrated sulfuric acid and a soluble chloride (this is the chromyl chloride test). These vapours, on passing into water, hydrolyse to give yellow chromic acid.