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Which of the following are the example of double salt ? (A) FeSO4.(NH4)2SO4.6H2O (B) CuSO4.4NH3.H2O (C) K2SO4.Al2(SO4)3.24H2O (D) Fe(CN)2.4KCN Choose the correct answer

1. B and D only
2. A and C
3. A, B and D only
4. A and B only

Correct answer: A and C

Solution

Double salts are formed from two different salts that crystallize together, and both A (FeSO4.(NH4)2SO4.6H2O) and C (K2SO4.Al2(SO4)3.24H2O) fit this definition, as they consist of two distinct cations and anions combined in a single crystalline structure.

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