Match column I and column II for the oxidation states of the central atoms.

Answer

`A.to(4)" "B.to(5)" "C.to(3)" "D.to(1)`

Explanation

`A.to(4)" "B.to(5)" "C.to(3)" "D.to(1)`
Suppose that x be the oxidation states of central atoms
A. Oxidation number of Cr in `Cr_(2)O_(7)^(2-)`
`2x+7(-2)=-2`
`2x-14=-2`
`2x=+12`
`x=+6`
B. Oxidation number of Mn in `MnO_(4)^(-)`
`x+4(-2)=-1`
`x-8=-1`
`x=+7`
C. Oxidation number of V in `VO_(3)^(-)`
`x+3(-2)=-1`
`x-6=-1`
`x=+5`
D. Oxidation number of Fe in `FeF_(6)^(3-)`
`x+6(-1)=-3`
`x-6=-3`
`x=+3`