Chemistry miscellaneousHard

Question

Which one is a pseudo alum :-

Options

A.K₂SO_4.Al₂(SO₄)_3.24H₂O

B.K₂SO_4.Cr₂(SO₄)_3.24H₂O

C.Na₂SO₄.Fe₂(SO₄)₃.24H₂O

D.CuSO₄.Al₂(SO₄)₃24H₂O

Solution

In Alum M₂SO₄. M₁² (SO₄)₃.24H₂O
here M must be monovalent

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