In preparation of alum from clays or bauxite, it is calcined and mixed with sulphuric acid heating gradually.

True

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False

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Solution

The correct option is A True
Preparation of Potash alum:- A more common production method is to treat bauxite ore with sulphuric acid and then with potassium sulphate. Ammonium alum is produced by the evaporation of a water solution containing ammonium sulphate and aluminium sulphate. So, the given statement is true.

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Give reason for the following :

(a) Though lead is above hydrogen in the activity series, it does not react with dilute hydrochloric acid or dilute sulphuric acid.

(b) Potassium and sodium are not used fro reaction with dilute hydrochloric acid or dilute sulphuric acid in laboratory preparation of hydrogen.

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