The pair of compounds having metals in their highest oxidation state is

Options

A. `MnO_2 and CrO_2 Cl_2`
B. `[NiCl_4]^(2-) and [CoCl_4]^(2-)`
C. `[Fe(CN)_6]^(3-) and [Cu(CN)_2]^(2-)`
D. `[FeCl_4]^(-) and Co_2 O_3`

Answer

A

Explanation

`Cr overset(2-)O_2 overset(-1)(Cl_2) " " Cr=+6 , MnO_2^(2-) " " Mn= +4`
(Highest oxidation state)
`[Ni overset(-1)Cl_4 ]^(2-) NI= +2, [Co Cl_4^(-1)]^(2-) Co =+2`
`[Feoverset(-1)((CN))_6]^(3-) Fe=+3 , [Cuoverset(-1)((CN))_4]^(2-) Cu = +2`
`[Fe overset(-1)(Cl_4)]^(-) Fe = +3 , Co_2 O_3^(-2) Co=+3`