Question

The magnetic moment of $K_2\left[MnC{l}_4\right]$ corrected to the nearest integer is _________.

• A. $6BM$
• B. $7BM$
• C. $8BM$
• D. $5BM$

Answer 1

Answer: (A)

$6BM$

In $K_2\left[MnC{l}_4\right]$ Mn is in $+2$ state, coordination number is $4.$

Since $C{l}^{-}$ is a weak field ligand, the five $3d$ electrons remain unpaired.

$\therefore$ Magnetic moment $=\sqrt{n(n+2)}BM=\sqrt{5(5+2)}BM$

$=\sqrt{35}=5.91BM\simeq 6BM$

Option A is correct.