Alum is :
(a) FeSO₄.(NH₄)₂SO₄.24H₂O
(b) Na₂SO₄. Al₂(SO₄)₃.24H₂O
(c) KCl.MgCl₂.6H₂O
(d) NaAlO₂
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b is Alum!!
HOPE U FIND IT HELPFUL!!!
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non of this
it is .
KAl(SO4)2
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