Which of the following complexes is the stron | vedclass

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(A) The reducing agent is a species that can easily lose an electron to get oxidized.In the complex $[Co(CN)_6]^{4-}$,the oxidation state of $Co$ is $

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$[Co(CN)_6]^{4-}$

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(A) The reducing agent is a species that can easily lose an electron to get oxidized.In the complex $[Co(CN)_6]^{4-}$,the oxidation state of $Co$ is $+2$ ($x + 6(-1) = -4$,so $x = +2$).$Co^{2+}$ has a $d^7$ electronic configuration.In the presence of strong field ligands like $CN^-$,the configuration becomes $t_{2g}^6 e_g^1$.The single electron in the $e_g$ orbital is very loosely held and can be easily lost to form the stable $t_{2g}^6$ configuration (which corresponds to $Co^{3+}$ in $[Co(CN)_6]^{3-}$).Therefore,$[Co(CN)_6]^{4-}$ is a very strong reducing agent.

Which of the following complexes is the strongest reducing agent?

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