Chemistry - Coordination Chemistry Question with Solution | TestHub

Question Explanation:

The question asks which statement correctly identifies examples of double salts among given compounds. You need to know what double salts are and distinguish them from coordination compounds and simple salts.

Concepts:

Double Salts, Ionic Salts.

Solution:

1. In a complex compound (coordination compound), the ions inside the coordination sphere do not give their characteristic tests in aqueous solution.

2. Mohr’s salt is FeSO₄·(NH₄)₂SO₄·6H₂O and potash alum is K₂SO₄·Al₂(SO₄)₃·24H₂O. Both contain two different salts crystallized together and are true "double salts."

3. K₄[Fe(CN)₆] does not give the test for free Fe²⁺ in solution because the iron is tightly bound in the $[Fe(CN{)}_6{]}^{4-}$ complex.

4. Fe₂(SO₄)₃ is simply an ionic salt, not a coordination compound.

So, the correct answer is (B)