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Question
Why [Co(en)3]3+ is a more stable complex than [Co(NH3)6]3+?
Short Answer
Solution
Why [Co(en)3]3+ is a more stable complex than [Co(NH3)6]3+ because ethylenediamine is a bidentate ligand that forms a chelate ring with the metal ion. Chelation increases the stability of the complex due to the chelate effect, which is thermodynamically favourable.
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