The number of unpaired electrons in ${\left[{\text{CoF}}_6\right]}^{3-}$ are

Solution

$\mathrm{C}{\mathrm{o}}^{3+}=$
In the presence of weak field ligand,
${\left[{\text{CoF}}_6\right]}^{3-}=$
$\therefore$ No. of unpaired electrons $=4$

Hence, the correct answer is 4.