Answer
(a) ZnSO4·H$_{2}$O(s)
Zinc Sulfate mono hydrate
(b) BaCl2·2H$_{2}$O(s)
Barium Chloride Dihydrate
(c) NiSO4·6H$_{2}$O(s)
Nickel (II) Sulfate Hexahydrate
(d) Na2S·9H$_{2}$O(s)
Sodium Sulfide Nonahydrate
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