How many electrons are present in $t_{2 g}$ set of $d - o r b i t a l s$ of central metal cation in $[F e (H_{2} O)_{5} (N O)] S O_{4}$ brown ring complex?

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Solution

The central iron atom is in +1 oxidation state. It has $3 d^{7}$ electronic configuration.
Due to weak-field ligands, the pairing energy is higher than $Δ_{o}$ . So, $t_{2 g}$ has 5 electrons.

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