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The following pair of ions have the same electronic configuration

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${Cr}^{3 +} a n d {Fe}^{3 +}$

${Fe}^{3 +} a n d {Mn}^{2 +}$

${Fe}^{3 +} a n d {Co}^{3 +}$

${Sc}^{3 +} a n d {Cr}^{3 +}$

answer is B.

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Detailed Solution

The electronic configuration of $F e^{3 +} a n d M n^{2 +}$ are same.

The electronic configuration of ${Fe}^{3 +}$ is [Ar]3d⁵4s⁰

The electronic configuration of ${Mn}^{2 +}$ is [Ar]3d⁵4s⁰

The electronic configuration of Cr⁺³ is [Ar]3d³4s⁰

The electronic configuration of Co⁺³ is [Ar]3d⁶4s⁰

The electronic configuration of Sc⁺³ is [Ar]

Hence, the correct option is option (B) .

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