Question

Shot note on inert complex

Answer 1

Transition metal complexes which undergo rapid substitution of one ligand for another are labile, whereascomplexes in which substitution proceed slowly or not at all are inert. For an inert complex, it is a large activation energy which prevents ligand substitution.Inert complexes are therefore kinetically stable compounds. 

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Answer 2

Inert means unreactive..

For an inert complex, it is a large activation energy which prevents ligand substitution....

Strong electrostatic force of attraction between metal and ligand makes the complex inert.