(i) Write down the IUPAC name of the following complex:
$[C o {(N H_{3})}_{5} (N O_{2})] {(N O_{3})}_{2}$
(ii) Write the formula for the following complex:
Potassium tetracyanidonickelate(II)

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Solution

$(i)$ Number of ${N O_{2}}^{-} g r o u p s = 3$
$(i i)$ Number of $N H_{3} g r o u p = 5$ (neutral ligand)
Hence, oxidation state of $C o = + 3$
Therefore, IUPAC Name of the complex is $p e n t a a m m i n e n i t r o c o b a l t (I I I) n i t r a t e$

$(i i)$ Number of ${C N}^{-} g r o u p s = 4$
Oxidation state of $N i = + 2$
Hence, number of potassium atoms $= 4 - 2 = 2$
Therefore formula of the complex is $K_{2} [N i (C N)_{4}]$

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