Question

The magnetic moment of $[Mn{X}_4{]}^{2-}$ is $5.9BM$. The geometry of the complex ion is : ($X=$ monodentate halide ion).

• A. Tetrahedral
• B. Square planar
• C. Both are possible
• D. None of these

Answer 1

The correct option is A Tetrahedral

The spin only magnetic moment is given by the formula ${\mu }_{eff}=\sqrt{n(n+2)}B.M.$

The magnetic moment of $[Mn{X}_4{]}^{2-}$ is $5.9BM$. This corresponds to five unpaired electrons.

Thus, the $M{n}^{2+}$ ion with $3d^5$ outer electronic configuration $[Mn{X}_4{]}^{2-}$ undergoes $s{p}^3$ hybridisation to form tetrahedral geometry.

So, the correct option is $A$