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  • The stabilisation of coordination compounds due to chelation is called the chelate effect. Which of the following is the most stable complex species? (i) [ {Fe}( {CO} ) _{5} ]

The stabilisation of coordination compounds due to chelation is called the chelate effect. Which of the following is the most stable complex species?

(i) \left [ \text {Fe}\left ( \text {CO} \right ) _{5}\right ]

(ii) \left [ \text {Fe}\left ( \text {CN} \right ) _{6}\right ]^{3-}

(iii) \left [ \text {Fe}\left ( \text {C}_{2}\text {O}_{4} \right ) _{3}\right ]^{3-}

(iv) \left [ \text {Fe}\left ( \text {H}_{2}\text {O} \right ) _{6}\right ]^{3+}

Answers (1)

Option (iii) is the correct answer.

Explanation: Chelation is the formation of cycle of linkages between the metal ion and ligands is responsible for stabilizing the coordination compounds. A ligand which chelates any metal ion is known as chelating ligand.

Here, oxalate ion is the chelating ligand and \left [ \text {Fe}\left ( \text {C}_{2}\text {O}_{4} \right ) _{3}\right ]^{3-} is the coordination compound. Hence, the oxalate ions stabilize the coordination compound by chelating \text {Fe}^{3+} ions.

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