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Problem
Problem
Which of the following double salt does not exist? a. (NH
4
)
2
SO
4
· CuSO
4
· 6H
2
O b. (NH
4
)
2
SO
4
· FeSO
4
· 6H
2
O c. (NH
4
)
2
SO
4
· ZnSO
4
· 6H
2
O d. (NH
4
)
2
SO
4
· NiSO
4
· 6H
2
O
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