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Which one of the following complex ions has geometrical isomers ? (en = ethylenediamine)

1. [Ni(NH3)5Br]+
2. [Co(NH3)2(en)2]3+
3. [Cr(NH3)4(en)2]3+
4. [Co(en)3]3+

Correct answer: [Co(NH3)2(en)2]3+

Solution

The complex ion [Co(NH3)2(en)2]3+ can exhibit geometrical isomerism due to the presence of two different types of ligands (NH3 and en) and the square planar geometry around the cobalt center, allowing for different spatial arrangements of the ligands.

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