Consider the following metal complexes. [ Co ( NH _ 3 ) ]^ 3+ [ C… - Vidyadip

MCQ

Consider the following metal complexes.

${\left[ Co \left( NH _{3}\right)\right]^{3+}}$

${\left[ CoCl \left( NH _{3}\right)_{5}\right]^{2+}}$

${\left[ Co ( CN )_{6}\right]^{3-}}$

${\left[ Co \left( NH _{3}\right)_{5}\left( H _{2} O \right)\right]^{3+}}$

The spin-only magnetic moment value of the complex that absorbs light with shortest wavelength is $B.M.$ (Nearest integer)

A
$3$
✓
$0$
C
$2$
D
$1$

✓

Answer

Correct option: B.

$0$

b
$\Delta_{0} \propto \frac{1}{\lambda}$

Here, $CN$ being SFL will have maximum $CFSE$ So, $\left[ Co ( CN )_{6}\right]^{3-}$ will be $d ^{2} sp ^{3}, \mu=0$

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