Which of the following double salt does not exists? – InterviewSolution

1.	Which of the following double salt does not exists?
Answer» `(NH_(4))_(2)SO_(4)CuSO_(4)6H_(2)O` `(NH_(4))_(2)SO_(4)FeSO_(4)6H_(2)O` `(NH_(4))_(2)SO_(4)ZmSO_(4)6H_(2)O` `(NH_(4))_(2)SO_(4)NiSO_(4)6H_(2)O` ANSWER :A

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