Which element from following exhibits various different oxidation states from +2 to +7 ?

Which element from following exhibits various different oxidation states from +2 to +7 ?
  1. Mn
  2. Cr
  3. V
  4. Ni

Solution

$\begin{array}{lll} & \text{Outer electronic configuration} \\ \mathrm{Mn} & 3 \mathrm{~d}^5 4 \mathrm{~S}^2 & (+2 \text{ to } +7) \\ \mathrm{Cr} & 3 \mathrm{~d}^5 4 \mathrm{~S}^1 & (+1 \text{ to } +6) \\ \mathrm{V} & 3 \mathrm{~d}^3 4 \mathrm{~S}^2 & (+2 \text{ to } +5) \\ \mathrm{Ni} & 3 \mathrm{~d}^8 4 \mathrm{~S}^2 & (+2 \text{ to } +4) \end{array}$

Asked in: MHT CET 2021 (22 Sep Shift 1)

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