Which of the following is paramagnetic ? | Chemistry | SolveeIt

Question

Which of the following is paramagnetic ?

$[Fe(CN)_6]^{4-}$

$[Ni(CO)_4]$

$[Ni(CN)_4]^{2-}$

$[CoF_6]^{3-}$

Answer

$[CoF_6]^{3-}$

Explanation

Solution

In $[Fe(CN)_6]^{4-} \, , Fe^{2+}$ has configuration of $[Ar]^{18}\, 3d^6$ . After pairing up of six $3d$ -electrons in three $d$ -orbitals, $d^2sp^3$ -hybridisation gives 6 empty hybridised orbitals for accommodating six pairs of electrons from six $CN^-$ ions. Thus no unpaired electron is present and hence diamagneti

Chemistry Question on coordination compounds

Solution