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

Question

MnO₂ and CrO₂Cl₂

[NiCl₄]^2$-$ and [CoCl₄]^2$-$

[Fe(CN)₆]^3$-$ and [Cu(CN)₄]^2$-$

[FeCl₄]^$-$ and Co₂O₃

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