$\left[{Co}\left({CN}_{6}\right)\right]^{4-}$ સંકીર્ણમાં ફકત સ્પિન ચુંબકીય ચાકમાત્રાનું મૂલ્ય $ ...... \, BM$ [પરમાણ્વીય ક્રમાંક ${Co}=27$ ]

Question

JEE MAIN 2021, Diffcult

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Solution

b
${\left[{CO}({CN})_{6}\right]^{4-}}$

${x}+6 \times(-1)=-4$

${x}=+2$

${Co}^{2+}:[{Ar}] 3 {~d}^{7}$

and ${CN}^{-}$is a strong field ligand which can pair electron of central atom.

It has one unpaired electron ( $n$ ) in $4d-$subshell.So spin only magnetic moment $(\mu)=\sqrt{n(n+2)}\, B . M$

where ${n}=$ number of unpaired electrons.

$\mu=\sqrt{3} \,{~B} . {M} \quad \mu=1.73\, {BM}$

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