Which of the following is more stable complex and why? ${[C o {(N H_{3})}_{6}]}^{3 +}$ and ${[C o {(e n)}_{3}]}^{3 +}$

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Solution

${[C o {(e n)}_{3}]}^{3 +}$ is more stable than ${[C o {(N H_{3})}_{6}]}^{3 +}$ as ${[C o {(e n)}_{3}]}^{3 +}$ is a metal chelate due to presece of bidentate ligand ethylene diamine ligand. Metal chelates are more stable than complexes containing only monodentate lignads.

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