1. Tardigrade
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  4. Considering H2O as a weak field ligand, the number of unpaired electrons in [Mn(H2O )6]2+ will be (At. no. of Mn = 25)

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Q. Considering $H_2O$ as a weak field ligand, the number of unpaired electrons in $[Mn(H_2O )_6]^{2+} $ will be (At. no. of $Mn = 25$)

AIPMTAIPMT 2004Coordination Compounds

Solution:

The oxidation number of manganese of $\left[ Mn \left( H _{2} O \right)_{6}\right]^{2+}$ is $+2$.
The electronic configuration of $Mn ^{2+}$ is $[ Ar ] 3 d ^{5}$ and hence the number of unpaired electrons are five.