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  • [Fe(CN)_{6}]^{4-}and [Fe(H_{2}O)_{6}]^{2+}are of different colours in dilute solutions. Why?

9.21     [Fe(CN)_{6}]^{4-}and [Fe(H_{2}O)_{6}]^{2+}are of different colours in dilute solutions. Why?

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In both compounds, the oxidation state of Fe is +2. Also, in [Fe(H_{2}O)_{6}]^{2+} we have weak field ligand whereas in   [Fe(CN)_{6}]^{4-} we have strong field ligand. So there is a difference in CFSE value in both the compounds. As a result, the colour shown by both compounds is different.

Posted by

Devendra Khairwa

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