Q10 of 40 Page 1

Using IUPAC norms write the formulae for the following :

(a) Sodium dicyanidoaurate(I)


(b) Tetraamminechloridonitrito-N-platinum (IV) sulphate

(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.


Formula: Na[Au(CN)2]


(b) Tetraamminechloridonitrito-N-platinum (IV) sulphate =


[Pt(NH3)4Cl(NO2)] SO4


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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