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Question

Common alum is:

A
K2SO4Al2(SO4)324H2O
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B
(NH4)2SO4FeSO46H2O
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C
K2SO4Cr2(SO4)324H2O
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D
K2SO4Fe2(SO4)324H2O
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Solution

The correct option is D K2SO4Al2(SO4)324H2O
Potassium alum is the common alum of commerce whose chemical formula is K2SO4.Al2(SO4)3.24H2O

Ammonium alum is (NH4)SO4.Al2(SO4)3.24H2O.

Chrome alum is K2SO4.Cr2(SO4)3.24H2O

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