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# Which of the Following is a More Stable Complex and Why ? [ C O ( N H 3 ) 6 ] 3 + a N D [ C O ( E N ) 3 ] 3 + - Chemistry

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Which of the following is a more stable complex and why ?

$\left[ Co \left( {NH}_3 \right)_6 \right]^{3 +} and \left[ Co \left( en \right)_3 \right]^{3 +}$
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#### Solution

Chelating ligands form more stable complexes compared to non-chelating ligands. Since ethylene diammine is a bidentate ligand and forms stable chelate, [Co(en)3]3+ will be a more stable complex than [Co(NH3)6]3+.
Concept: Introduction of Coordination Compounds
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