Question

Consider the following metal complexes :
${\left[Co\left(N{H}_3\right)\right]}^{3+}$
${\left[CoCl{\left(N{H}_3\right)}_5\right]}^{2+}$
${\left[Co(CN{)}_6\right]}^{3-}$
${\left[Co{\left(N{H}_3\right)}_5\left(H_{2}O\right)\right]}^{3+}$
The spin-only magnetic moment value of the complex that absorbs light with shortest wavelength is B.M. (Nearest integer)

Answer 1

Answer: 0

${\Delta }_0\propto \frac{1}{\lambda }$
Here, $C{N}^{-}$being SFL will have maximum CFSE
So, ${\left[Co(CN{)}_6\right]}^{3-}$ will be $d^{2}s{p}^3,\mu =0$