સંકિર્ણ $[M(H_2O)_6]Cl_2$ માં ધાતુ આયનની કઈ જોડી $3.9\, BM$ ની ફક્ત સ્પિન ચુંબકીય ચાકમાત્રા આપે છે?

Question

JEE MAIN 2019, Diffcult

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Solution

a
$H_2O$ is weak field ligand and magnetic moment $=$ moment $=\,\sqrt {n(n+2)} \,BM$

Solving for $'n'$ we get it as $3;$ i.e., no. of unpaired electron $=\,3$

$F{e^{2 + }}\, = \,{t_{2g}}^4\,{e_g}^2$

$C{o^{2 + }}\, = \,{t_{2g}}^5\,{e_g}^2$

${V^{2 + }}\, = \,t_{2g}^3\,{e_g}^0$

$\therefore \,\,M$ is $V,\,Co$

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