Which of the following statements is incorrec | vedclass

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(C) In $K_3[CoF_6]$,the oxidation state of $Co$ is $x + 6(-1) = -3$,so $x = +3$.$Co^{3+}$ has the electronic configuration $[Ar] 3d^6$.$F^-$ is a weak

Vedclass · Accepted Answer

The primary valency of $Co$ is $6$.

Vedclass · Answer

(C) In $K_3[CoF_6]$,the oxidation state of $Co$ is $x + 6(-1) = -3$,so $x = +3$.$Co^{3+}$ has the electronic configuration $[Ar] 3d^6$.$F^-$ is a weak field ligand,so it does not cause pairing of electrons.Thus,$Co^{3+}$ has $4$ unpaired electrons,and the magnetic moment is $\mu = \sqrt{n(n+2)} = \sqrt{4(4+2)} = \sqrt{24} \, BM$.This confirms it is a high spin complex with $sp^3d^2$ hybridization.The primary valency refers to the oxidation state,which is $3$,not $6$. The coordination number is $6$ (secondary valency). Therefore,statement $C$ is incorrect.

List-$I$ (Molecules/ion)	List-$II$ (Hybridisation of central atom)
$A. PF_5$	$I. dsp^2$
$B. SF_6$	$II. sp^3d$
$C. Ni(CO)_4$	$III. sp^3d^2$
$D. [PtCl_4]^{2-}$	$IV. sp^3$

Which of the following statements is incorrect for $K_3[CoF_6]$?

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