	List I		List II
	Coordination Complex		Number of unpaired electrons
A.	${[Cr {(CN)}_{6}]}^{3 -}$	I.	0
B.	${[Fe {(H_{2} O)}_{6}]}^{2 +}$	II.	3
C.	${[Co {({NH}_{3})}_{6}]}^{3 +}$	III.	2
D.	${[Ni {({NH}_{3})}_{6}]}^{2 +}$	IV.	4

	Complex ion number of unpaired electrons	E.C
(A)	$\begin{matrix} {[{Cr (CN)}_{6}]}^{3 -} \\ 3 \Rightarrow A-II \end{matrix}$	${}_{24}{Cr}^{3 +} = 3 d^{3} \Rightarrow t_{2 g}^{1, 1, 1}, e_{g}^{0, 0}$
(B)	$\begin{matrix} {[{Fe (H_{2} O)}_{6}]}^{2 +} \\ 4 \Rightarrow B-IV \end{matrix}$	${}_{26}{Fe}^{2 +} = 3 d^{6} \Rightarrow t_{2 g}^{2, 1, 1}, e_{g}^{1, 1}$
(C)	$\begin{matrix} {[{Co ({NH}_{3})}_{6}]}^{3 +} \\ 0 \Rightarrow C-I \end{matrix}$	${}_{27}{Co}^{3 +} = 3 d^{6} \Rightarrow t_{2 g}^{2, 2, 2}, e_{g}^{0, 0}$
(D)	$\begin{matrix} {[{Ni ({NH}_{3})}_{6}]}^{2 +} \\ 2 \Rightarrow D-III \end{matrix}$	${}_{28}{Ni}^{2 +} = 3 d^{8} \Rightarrow t_{2 g}^{2, 2, 2}, e_{g}^{1, 1}$

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