Which of the following salt is a double salt?

Which of the following salt is a double salt?

A. Mg(OH)NO3 

B. NaHCO3

C. KAI(SO4)2.12H2O

D. K2SO4

The correct answer is:

C. KAl(SO₄)₂·12H₂O

Explanation:
A double salt is formed when two simple salts crystallize together in a fixed proportion and dissociate completely into all their constituent ions in solution.

• KAl(SO₄)₂·12H₂O is potash alum, a classic example of a double salt. In water, it dissociates into K⁺, Al³⁺, and SO₄²⁻ ions.

• Mg(OH)NO₃ is a basic salt.

• NaHCO₃ is an acid salt.

• K₂SO₄ is a normal (simple) salt.

✅ Answer: C

PQN: 16