Question

Which of the following statements is correct for $[Mn(CN)_{6}]^{3-}$ according to valence bond theory?

• A. $d^{2}sp^{3}$, inner orbital complex, paramagnetic, $2.87 \,B.M$
• B. $d^{2} sp^{3}$, inner orbital complex, diamagnetic, zero magnetic moment
• C. $d^{2} sp^{3}$, outer orbital complex, paramagnetic, $3.87 \,B.M$
• D. $dsp^{2}$, outer orbital complex, diamagnetic, zero magnetic moment

Answer 1

Answer: (A)

In $[Mn(CN)_{6}]^{3-}$, oxidation state of $Mn = +3, Mn^{3+} = 3d^{4}$
$[Mn(CN)_{6}]^{3-}$ :
It has two unpaired electrons.
$\mu=\sqrt{n\left(n+2\right)}=\sqrt{2\left(2+2\right)}=\sqrt{8}$
$=2.87 \, B.M.$