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Among the following complexes, optical activity is possible in

1. [Co(NH3)6]3+
2. [Co(H2O)2(NH3)2Cl2]+
3. [Cr(H2O)2Cl2]+
4. [Co(CN)5NC]

Correct answer: [Co(H2O)2(NH3)2Cl2]+

Solution

Optical activity is possible in complexes that lack a plane of symmetry and are non-superimposable on their mirror images. [Co(H2O)2(NH3)2Cl2]+ can exhibit optical isomerism due to its asymmetric arrangement of ligands.

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