Which pair of compounds contains both metals in their highest possible oxidation state?
- A$[Fe(CN)_6]^{3-}, [Co(CN)_6]^{3-}$
- B$CrO_2Cl_2, MnO_4^-$
- C$TiO_3, MnO_2$
- D$[Co(CN)_6]^{3-}, MnO_3$
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