Question

Which of the following pair contains a complex salt and double salt respectively?

Options

• [Cu(NH₃)₄]SO₄, K₂SO₄.Al₂(SO₄)₃.24H₂O

• [Cu(NH₃)₄]SO₄, FeSO₄.7H₂O

• FeSO₄, K₄[Fe(CN)₆]

• MgSO₄.7H₂O, CuSO₄

Answer 1

[Cu(NH₃)₄]SO₄, K₂SO₄.Al₂(SO₄)₃.24H₂O

Explanation:

[Cu(NH₃)₄]SO₄ is a complex salt because it contains a coordination entity (central metal ion Cu²⁺ with 4 ligand molecules of NH₃ in the coordination sphere) while K₂SO₄.Al₂(SO₄)₃.24H₂O is double salt as it can dissociate completely into simple ions when it is dissolved in water.