ફ્ક્ત સ્પિન ${Fe}^{2+}$ના અષ્ટફલકીય સંકીર્ણની પ્રબળ ક્ષેત્ર લિગાન્ડની હાજરીમાં માત્ર ચુંબકીય ચાકમાત્રા $......\,B.M.$ છે.

Question

JEE MAIN 2021, Diffcult

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Solution

b
In presence of SFL $\Delta_{0}\,>\,{P}$ means pairing occurs therefore For ${Fe}^{+2}\,\,3 {~d}^{6}$

$\therefore$ No of unpaired ${e}-({s})=0$

$\therefore \mu=\sqrt{n(n(n+2)}\,\, {BM}=0$

$[{n}=$ No of unpaired ${e}-({s})]$

In ${NiCl}_{2} {Ni}^{+2}$ is having configuration $3 {~d}^{8}$

$\therefore$ Number of unpaired electron $=2$

After formation of oxidised product

$\left[{Ni}({CN})_{6}\right]^{-2} {Ni}^{+4}$ is obtained

${Ni}^{{t}} \Rightarrow 3 {~d}^{6}$ and ${CN}^{-}$is strong field ligand

$\therefore$ number of unpaired electrons $=0$

$\therefore$ The charge is $2-0=2$

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