Match the Column-$I$ with Column-$II$ for the oxidation states of the central atoms.

Column-$I$	Column-$II$
$A$. $Cr_2O_7^{2-}$	$1$. $+3$
$B$. $MnO_4^{-}$	$2$. $+4$
$C$. $VO_3^{-}$	$3$. $+5$
$D$. $FeF_6^{3-}$	$4$. $+6$
	$5$. $+7$

(A-4, B-5, C-3, D-1) The correct matching is $A-4, B-5, C-3, D-1$.
$(A)$ For $Cr_2O_7^{2-}$: $2(Cr) + 7(-2) = -2 \implies 2(Cr) = +12 \implies Cr = +6$.
$(B)$ For $MnO_4^{-}$: $Mn + 4(-2) = -1 \implies Mn = +7$.
$(C)$ For $VO_3^{-}$: $V + 3(-2) = -1 \implies V = +5$.
$(D)$ For $FeF_6^{3-}$: $Fe + 6(-1) = -3 \implies Fe = +3$.