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  4. The ionisation isomer of [Cr(H2O )4Cl(NO2 )]Cl is

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Q. The ionisation isomer of $[Cr(H_2O )_4Cl(NO_2 )]Cl$ is

IIT JEEIIT JEE 2010Coordination Compounds

Solution:

Ionisation isomers are the complexes that produces different ions in solution, i.e. they have ions interchanged inside and outside the coordination sphere.
$[Cr(H_2O)_4Cl(NO_2)]Cl$ and $[Cr(H_2O)_4Cl_2](NO_2)$ have different ions inside and outside the coordinate sphere and they are isomers.
Therefore, they are ionisation isomers.