Q .     Which of the following is an alum?

UPSEE 2014
A

`Na AlO_2`

B

`Na_2SO_4 ·Al_2 (SO_4 )_3 ·24H_2O`

C

`KCl · MgCl_2 · 6H_2O`

D

`FeSO_4 · (NH_4 )_2 SO_4 · 6H_2O`

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