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The pair of ions having same electronic ...

The pair of ions having same electronic configuration is__________.

A

`Cr^(3+),Fe^(3+)`

B

`Fe^(3+),Mn^(2+)`

C

`Fe^(3+),Co^(3+)`

D

`Sc^(3+),Cr^(3+)`

Text Solution

Verified by Experts

The correct Answer is:
B
Cr(24) : `3d^(5)4s^(1),Cr^(3+):3d^(3)`
Fe(26) : `3d^(6)4s^(2),Fe^(3+):3d^(5)`
Mn(25) : `3d^(5)4s^(2),Mn^(2+):3d^(5)`
Co(27) : `3d^(7)4s^(2),Co^(3+):3d^(6)`
Sc(21) : `3d^(1)4s^(2),Sc^(3+):3d^(0)`
Thus, `Fe^(3+) and Mn^(2+)` have same electronic configuration.
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