Question

What are the correct oxidations state, coordination number, configurations, magnetic character and magnetic moment of $K_{4}\lbrack Mn(CN)_{6}\rbrack$?

O.S. C.N. Configu- Magnetic Magnetic

-ration Character moment

• A. +6 6 $t_{2g}^{5}$ Diamagnetic 0
• B. +4 6 $t_{2g}^{4}e_{g}^{1}$ Paramagnetic $1.732B.M$
• C. +2 6 $t_{2g}^{5}$ Paramagnetic $1.732B.M$
• D. +4 6 $t_{2g}^{3}e_{g}^{2}$ Diamagnetic 0

Answer 1

Answer: (C)

+2 6 $t_{2g}^{5}$ Paramagnetic $1.732B.M$

Answer 2

O.S. +2, C.N. = 6, configurations $= t_{2}^{5}g$

$Mn^{2 +} = 4s^{0}3d^{5}$

It has one unpaired electron and hence it is paramagnetic in nature.

$\mu = \sqrt{1(1 + 2)} = \sqrt{3} = 1.732B.M.$