The pair of the compounds in which both the metals are in...

The pair of the compounds in which both the metals are in the highest possible oxidation state is: (a) $\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3}, \mathrm{MnO}_{2}$ (b) $\mathrm{CrO}_{2} \mathrm{Cl}_{2}, \mathrm{MnO}_{4}^{-}$ (c) $\mathrm{TiO}_{3}, \mathrm{MnO}_{2}$ (d) $\left[\mathrm{Fe}(\mathrm{N})_{6}\right]^{3-},\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3}$

The pair of the compounds in which both the metals are in the highest possible oxidation state is:
(a) $\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3}, \mathrm{MnO}_{2}$
(b) $\mathrm{CrO}_{2} \mathrm{Cl}_{2}, \mathrm{MnO}_{4}^{-}$
(c) $\mathrm{TiO}_{3}, \mathrm{MnO}_{2}$
(d) $\left[\mathrm{Fe}(\mathrm{N})_{6}\right]^{3-},\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3}$

Key Concepts

Oxidation State Determination

This concept involves calculating the oxidation number of an element in a compound by considering the known oxidation states of other elements and the overall charge of the species. For transition metal complexes, this often means accounting for the charges of coordinated ligands and the overall complex charge, which helps in identifying whether the metal is in its highest possible oxidation state.

Highest Possible Oxidation State

Understanding the highest possible oxidation state of a metal is crucial in inorganic chemistry as it reflects the maximum positive charge the metal ion can achieve. This is determined by the electron configuration of the metal and its ability to stabilize high oxidation numbers through bonding with suitable ligands or oxygen atoms in oxides.

Coordination Chemistry

Coordination compounds, or complexes, involve a central metal ion bonded to surrounding ligands. The geometry, nature of the ligands, and the overall charge of the complex play significant roles in determining the oxidation state of the metal center. This area of study is essential for analyzing how different ligands can stabilize high or unusual oxidation states in metals.

Ligand Effects on Oxidation States

Ligands can significantly influence the oxidation state of a metal center through their electron-donating or electron-withdrawing properties. Strong field ligands, for example, can stabilize higher oxidation states by providing sufficient electron density or by creating a stable electronic environment for the metal ion, which is a key factor when assessing compounds for the highest possible oxidation state.

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