Which among the following is a Pseudoalum

1.	Which among the following is a Pseudoalum
Answer» `(NH_(4))_(2) SO_(4).Fe_(2)(SO_(4))_(3).24H_(2)O` `MgSO_(4).Al_(2)(SO_(4))_(3).24H_(2)O` `K_(2)SO_(4).Cr_(2)(SO_(4))_(3).24H_(2)O` `Na_(2)SO_(4).Al_(2)(SO_(4))_(3).24H_(2)O` Answer :B

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