Question

The hybridisation and the total number of unpaired electrons on $Fe$ in $[Fe{F}_6{]}^{3-}$ are respectively:

• A. $d^{2}s{p}^3,4$
• B. $d^{2}s{p}^3,5$
• C. $s{p}^3{d}^2,5$
• D. $s{p}^3{d}^2,3$

Answer 1

The correct option is C $s{p}^3{d}^2,5$

$[Fe{F}_6{]}^{3-},F^{-}$ is a weak field ligand. Hence, pairing of electrons will not take place. The electronic configuration of
$F{e}^{3+}\to 1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^5$