Which one of the following shows maximum para | vedclass

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(A) $(I) [Fe(CN)_6]^{3-}$Here,the oxidation state of $Fe$ is $+3$.The electronic configuration of $Fe$ (ground state) is $[Ar] 3d^6 4s^2$.The electron

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$[Fe(CN)_6]^{3-}$

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(A) $(I) [Fe(CN)_6]^{3-}$Here,the oxidation state of $Fe$ is $+3$.The electronic configuration of $Fe$ (ground state) is $[Ar] 3d^6 4s^2$.The electronic configuration of $Fe^{3+}$ is $[Ar] 3d^5 4s^0$.Number of unpaired electrons $= 5$.$(II) [Fe(CN)_6]^{4-}$Here,the oxidation state of $Fe$ is $+2$.The electronic configuration of $Fe^{2+}$ is $[Ar] 3d^6 4s^0$.Due to the strong field ligand $CN^-$,the electrons pair up,resulting in $0$ unpaired electrons.$(III) [Cr(H_2O)_6]^{3+}$Here,the oxidation state of $Cr$ is $+3$.The electronic configuration of $Cr^{3+}$ is $[Ar] 3d^3 4s^0$.Number of unpaired electrons $= 3$.$(IV) [Cu(H_2O)_6]^{2+}$Here,the oxidation state of $Cu$ is $+2$.The electronic configuration of $Cu^{2+}$ is $[Ar] 3d^9 4s^0$.Number of unpaired electrons $= 1$.The paramagnetic character is directly proportional to the number of unpaired electrons.Therefore,$[Fe(CN)_6]^{3-}$ has the maximum paramagnetic character.

Which one of the following shows maximum paramagnetic character?

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