(a) Sodium dicyanidoaurate(I) = Na[Au(CN)2]
Explanation: Dicyanido means 2 cyanide ions with gold(Au) in +2 oxidation state.
Cyanide ions have a negative charge of -1, so balancing the overall charge of the coordination compound to be 0, no. of sodium ion is 1.
(b) Tetraamminechloridonitrito-N-platinum (IV) sulphate =
Explanation: Anion is SO42-.Tetraammine means 4 neutral ammonia molecules, nitrito-N means nitro group bonded to a central atom via the lone pair of electron of nitrogen and platinum in +4 state. Balance overall charge as 0.
Formula: [Pt(NH3)4Cl(NO2)] SO4
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