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The existence of two different coloured complexes with the composition of [Co(NH3)4Cl2]+ is due to:

1. linkage isomerism
2. geometrical isomerism
3. coordination isomerism
4. ionization isomerism

Correct answer: geometrical isomerism

Solution

The two different coloured complexes arise due to geometrical isomerism, as the ligands (NH3 and Cl) can arrange themselves differently around the central cobalt ion in cis and trans configurations.

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