Chemistry miscellaneousHard

Question

Which one is a pseudo alum :-

Options

A.K2SO4.Al2(SO4)3.24H2O
B.K2SO4.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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