Question

In preparation of alum from alunite, it is roasted

• A. True
• B. False

Answer 1

The correct option is B False

Alunite is a hydrated aluminium potassium sulfate mineral.

As Potassium Alum is prepared by dissolving an equimolar mixture of hydrated aluminium sulphate and potassium sulphate in a minimum amount of water containing a little of sulphuric acid and subjecting the resulting solution to crystallization, where octahedral crystals of potash alum separate out.

So, in the preparation of alum from alunite, it is not roasted.