Which one is a pseudo alum

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p-Block Elements - I

easy

Which one is a pseudo alum

A

$(NH_4)_2SO_4.Fe_2(SO_4)_3.24H_2O$

B

$K_2SO_4.Cr_2(SO_4)_3.24H_2O$

C

$MnSO_4.Al_2(SO_4)_3.24H_2O$

D

None of these

Solution

Alum $\mathrm{M}_{2} \mathrm{SO}_{4}\,\, \,\mathrm{M}_{2}^{\prime}\left(\mathrm{SO}_{4}\right)_{3} \cdot 24 \mathrm{H}_{2} \mathrm{O}$

here $M=M^{+}$ monovalent

$M^{\prime}=M^{+2} \text { divalent }$

Standard 11

Chemistry

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