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a
[Cr(H2O)4(O2N)]CI2
b
[Cr(H2O)4CI2](NO2)
c
[Cr(H2O)4CI(NON )]CI
d
[Cr(H2O)4CI2(NO2)]H2O
answer is B.
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Detailed Solution
The ionisation isomer of [Cr(H2O)4CI(NO2)]CI is [Cr(H2O)4CI2](NO2).CI⊝ is replaced by NO2⊝ in ionisation sphere.CrH2O4ClNO2Cl→CrH2O4ClNO2⊕+ClΘCrH2O4Cl2NO2→CrH2OCl2+NO2ΘBoth of them give different ions on dissociation.