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in P - block elements by (57.4k points)

Which mixed sulphate is not an alum: 

(A) K2SO4.Al2(SO4)3.24H2

(B) K2SO4.Cr2(SO4)3.24H2

(C) Na2SO4.Fe2(SO4)3.24H2

(D) CuSO4.Al2(SO4)3.24H2O

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Best answer

(D) CuSO4.Al2(SO4)3.24H2O

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