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(D) Complexes of $[MA_4B_2]$ type exhibit geometrical isomerism.The complex $[Co(NH_3)_4Cl_2]^+$ is a $[MA_4B_2]$ type complex and thus,fulfills the c

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geometrical isomerism

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(D) Complexes of $[MA_4B_2]$ type exhibit geometrical isomerism.The complex $[Co(NH_3)_4Cl_2]^+$ is a $[MA_4B_2]$ type complex and thus,fulfills the conditions that are necessary to exhibit geometrical isomerism.Hence,it has two geometrical isomers (cis and trans) of different colours.For linkage isomerism,the presence of an ambidentate ligand is necessary.For coordination isomerism,both the cation and anion of the complex must be complex ions.For ionisation isomerism,an anion different from the ligands must be present outside the coordination sphere.All these conditions are not satisfied by this complex. Hence,it does not exhibit other given isomerisms.

The existence of two different coloured complexes with the composition of $[Co(NH_3)_4Cl_2]^+$ is due to

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