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The type of isomerism shown by the complex [CoCl2(en)2] is

1. Geometrical isomerism
2. Coordination isomerism
3. Linkage isomerism
4. Ionization isomerism

Correct answer: Geometrical isomerism

Solution

The complex [CoCl2(en)2] exhibits geometrical isomerism because the two bidentate ethylenediamine (en) ligands and two chloride ligands can arrange themselves in cis (adjacent) or trans (opposite) positions around the central cobalt ion.

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