Question

Potash alum is an example of a:

• A. Simple salt
• B. Complex salt
• C. Acid salt
• D. Double salt

Answer 1

The correct option is D

Double salt

Potash alum is potassium double sulphate of aluminium, i.e. a double salt as it contains more than one cation. Its formula is $KAlS{O}_4$. So, the cations present in potash alum are $K^{+}$ and $A{l}^{+3}$.