Give the formulae of the following compounds :
(a) Potassium tetrahydroxidozincate (II)
(b) Hexaammineplatinum (IV) chloride
(a) Potassium tetrahydroxidozincate (II) is K2[Zn(OH)4]
(b) Hexaammineplatinum (IV) chloride is [Pt(NH3)6]Cl4
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