(A) The $EAN$ (Effective Atomic Number) is calculated as: $EAN = Z - \text{oxidation state} + 2 \times \text{coordination number}$. For $[PtCl_6]^{2-

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Effective atomic number of $Pt$ in $[PtCl_6]^{2-} = 84$

(A) The $EAN$ (Effective Atomic Number) is calculated as: $EAN = Z - \text{oxidation state} + 2 \times \text{coordination number}$. For $[PtCl_6]^{2-}$,the atomic number of $Pt$ $(Z)$ is $78$. The oxidation state of $Pt$ is $x + 6(-1) = -2$,so $x = +4$. The coordination number is $6$. $EAN = 78 - 4 + 2(6) = 74 + 12 = 86$. Since the given value in option $A$ is $84$,it is incorrectly matched.

Class 12 Chemistry Coordination Compounds EAN number

Medium

Which of the following pairs is not correctly matched?

A
Effective atomic number of $Pt$ in $[PtCl_6]^{2-} = 84$
B
Absorption peak for $[Cr^{III}(NH_3)_6]^{3+} = 21680 \ cm^{-1}$
C
Crystal field stabilization energy of $d^2$ in weak ligand field $= (-)0.8 \ \Delta_0$
D
Example of weak ligand field for $d^5$ configuration $= [Mn^{II}F_6]^{4-}$