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Chemistry · PYQ NEET UG 2023
हिन्दीWhich complex compound is most stable?\n(1) \( [\text{Co}(\text{NH}_3)_4(\text{H}_2\text{O})\text{Br}](\text{NO}_3)_2 \)\n(2) \( [\text{Co}(\text{NH}_3)_3(\text{NO}_3)_3] \)\n(3) \( [\text{CoCl}_2(\text{en})_2]\text{NO}_3 \)\n(4) \( [\text{Co}(\text{NH}_3)_6]_2(\text{SO}_4)_3 \)
Correct answer · Option 1
\( [\text{CoCl}_2(\text{en})_2]\text{NO}_3 \)
Explanation
Chelate complexes are more stable due to the chelate effect. Ethylenediamine (en) is a bidentate chelating ligand present in \( [\text{CoCl}_2(\text{en})_2]\text{NO}_3 \), making it the most stable complex.
