Number of unpaired electrons in $M n^{3 +}$ is

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Solution

The correct option is C 4
Atomic number of Mn is 25
Electronic configuration : $[A r] 3 d^{5} 4 s^{2}$
The electronic configuration of $M n^{3 +}$ is $[A r] 3 d^{4} s^{0}$ .
So, there are 4 unpaired electrons in 3d.

Hence, correct option is (c).

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