1. Tardigrade
  2. Question
  3. Chemistry
  4. Consider the following metal complexes: [ Co ( NH 3)]3+ [ CoCl ( NH 3)5]2+ [ Co ( CN )6]3- [ Co ( NH 3)5( H 2 O )]3+ The spin-only magnetic moment value of the complex that absorbs light with shortest wavelength is B.M. (Nearest integer)

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Q. 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)

JEE MainJEE Main 2022Coordination Compounds

Solution:

$\Delta_0 \propto \frac{1}{\lambda}$
Here, $CN ^{-}$being SFL will have maximum CFSE
So, $\left[ Co ( CN )_6\right]^{3-}$ will be $d ^2 sp ^3, \mu=0$