Effective atomic number of central metal in the complexes $K_{2} [N i (C N)_{4}], [C u (N H_{3})_{4}] S O_{4}$ and $K_{2} [P t C l_{6}]$ are $x$ , $y$ and $z$ respectively. Calculate the value of $\frac{x + y + z}{5}$

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Solution

$Effective Atomic Number (EAN) = atomic number - oxidiation state of central metal atom + 2 (number of ligands)$
$K_{2} [N i (C N)_{4}] : E A N = 28 - 2 + 2 \times 4 = 34 [C u (N H_{3})_{4}] S O_{4} : E A N = 29 - 2 + 2 \times 4 = 35 K_{2} [P t C l_{6}] : E A N = 78 - 4 + 2 \times 6 = 86 x = 34, y = 35, z = 86 S o, \frac{x + y + z}{5} = \frac{34 + 35 + 86}{5} = 31$

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