Chemistry - Complete d-block Question with Solution | TestHub

The correct option is (B) VO₂⁺ < Cr₂O₇²⁻ < MnO₄⁻.

In these species, the central metals V⁺⁵, Cr⁺⁶, and Mn⁺⁷ are all in their highest oxidation states ($3d^0$ configuration).

Moving across the period from left to right (V $\to$ Cr $\to$ Mn), the nuclear charge increases, while atomic size decreases. This higher nuclear charge strongly increases the central atom's tendency to accept electrons (reduction potential).

Therefore, the oxidizing power increases sequentially as the nuclear attraction for incoming electrons grows stronger.