Coordination Compounds Question 5
Question 5 - 25 January - Shift 1
The number of paramagnetic species from the following is
$[Ni(CN)_4]^{2-},[Ni(CO)_4],[NiCl_4]^{2-}$
$[Fe(CN)_6]^{4},[Cu(NH_3)_4]^{2+}$
$[Fe(CN)_6]^{3-}$ and $[Fe(H_2 O)_6]^{2+}$
Show Answer
Answer: (4)
Solution:
Formula: Crystal field theory
$ [Ni(CN)_4]^{2-}: Ni^{+2}=\text{ Whllal } $
diamagnetic
${ }^{-} CN$ : strong field ligand
$3 d^{10}$
$Cl^{-}$: weak field ligand
${ }^{-} CN$ : strong field ligand
$[Cu(NH_3)_4]^{+2}: Cu^{+2} \Rightarrow$ one unpaired electron
paramagnetic
paramagnetic, ${ }^{-} CN$ : strong field ligand
paramagnetic $H_2 O$ : Weak field ligand
