In which of the following complexes is the effective atomic number not equal to the atomic number of an inert gas?

N i (C O)_{4}

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[C o (N H_{3})_{6}]^{3 +}

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[F e (C N)_{6}]^{4 -}

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[C u C l_{2}]^{-}

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Solution

The correct option is D $[C u C l_{2}]^{-}$
a. Effective atomic number of $N i (C O)_{4}$ = $28 + 2 \times 4 = 36$ .
36 is the atomic number of $K r$ .
b. Effective atomic number of $[C o (N H_{3})_{6}]^{3 +}$ = $27 - 3 + 6 \times 2 = 36$
c. Effective atomic number of $[F e (C N)_{6}]^{4 -}$ = $26 - 2 + 6 \times 2 = 36$
d. Effective atomic number of $[C u C l_{2}]^{-}$ = $29 - 1 + 2 \times 2 = 32$
So the effective atomic number of $C u C l_{2}$ is not equal to the atomic number of inert gas.

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