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

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The pair of compounds having metals in their highest oxidation state is .
A. `MnO_(2),FeCl_(3)`
B. `[MnO_(4)]^(-),CrO_(2)Cl_(2)`
C. `[Fe(CN)_(6)]^(2),[Co(CN)_(6)]^(3-)`
D. `[NiCl_(4)]^(2-),[Ni(CO)_(4)]`.
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Correct Answer - B
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