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Question:

The ionization isomer of [Cr(H2O)4Cl(NO2)]Cl is:

[Cr(H2O)4Cl(ONO)]Cl

[Cr(H2O)4(O2N)]Cl2

[Cr(H2O)4Cl2(NO2)]H2O

Solution:

Ionization isomers are identical except for a ligand has exchanged places with an anion or neutral molecule that was originally outside the coordination complex. Thus, in ionization isomerism the central ion and the other ligands are identical. So, according to the definition, Cl⁻ is replaced by NO₂⁻ in the ionization sphere. Thus the correct answer is option B.