Which complex among the following is most par | vedclass

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(C) The paramagnetism of a complex depends on the number of unpaired electrons $(n)$.$1.$ In $[Co(NH_3)_6]^{2+}$,$Co$ is in $+2$ oxidation state. $Co^

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$[Co(H_2O)_6]^{2+}$

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(C) The paramagnetism of a complex depends on the number of unpaired electrons $(n)$.$1.$ In $[Co(NH_3)_6]^{2+}$,$Co$ is in $+2$ oxidation state. $Co^{2+} = [Ar] 3d^7$. $NH_3$ is a strong field ligand,so $n = 1$.$2.$ In $[Co(NH_3)_6]^{3+}$,$Co$ is in $+3$ oxidation state. $Co^{3+} = [Ar] 3d^6$. $NH_3$ is a strong field ligand,so $n = 0$.$3.$ In $[Co(H_2O)_6]^{2+}$,$Co$ is in $+2$ oxidation state. $Co^{2+} = [Ar] 3d^7$. $H_2O$ is a weak field ligand,so $n = 3$.$4.$ In $[Co(H_2O)_6]^{3+}$,$Co$ is in $+3$ oxidation state. $Co^{3+} = [Ar] 3d^6$. $H_2O$ acts as a strong field ligand for $Co^{3+}$,so $n = 0$.Since $[Co(H_2O)_6]^{2+}$ has the maximum number of unpaired electrons $(n=3)$,it is the most paramagnetic.

Which complex among the following is most paramagnetic?

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