Question

Choose the correct answer form the alternatives given.
$[Co{F}_6{]}^{3-}$ is ?

• A. paramagnetic and undergoes $s{p}^3{d}^2$hybridisation
• B. diamagnetic and undergoes $d^{2}s{p}^3$ hybridisation
• C. paramagnetic and undergoes $s{p}^{3}d$ hybridisation
• D. diamagnetic and undergoes $s{p}^3$ hybridisation.

Answer 1

Answer: (A)

paramagnetic and undergoes $s{p}^3{d}^2$hybridisation

$[Co{F}_3{]}^{3-}\Rightarrow C{o}^{3+}\Rightarrow [Ar]3d^6$

$\Rightarrow F^{-}\Rightarrow$ Weak Field ligands.

Electrons donot get paired.(Refer to image)

Has $s{p}^3{d}^2$ hybridisation = octahedral.

So the complex is paramagnetic.