Question

Which of the following statement is correct for $\lbrack Mn(CN)_{6}\rbrack^{3 -}$according to valence bond theory ?

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

Answer 1

Answer: (A)

$d^{2}sp^{3},$ inner orbital complex, paramagnetic, $2.87B.M.$

Answer 2

In $\lbrack Mn(CN)_{6}\rbrack^{3 -},$ oxidation state of Mn = +3, $Mn^{3 +} = 3d^{4}$

It has two unpaired electrons.