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(D) The complex is $[PdCl_2(H_2O)_2(NH_3)_2]^{2+}$.Here,$Pd$ is in the $+4$ oxidation state $(Pd^{4+})$,which has a $4d^6$ configuration.Since $Pd$ is

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Fac. and Mer. form

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(D) The complex is $[PdCl_2(H_2O)_2(NH_3)_2]^{2+}$.Here,$Pd$ is in the $+4$ oxidation state $(Pd^{4+})$,which has a $4d^6$ configuration.Since $Pd$ is a $4d$ series metal,it forms low-spin complexes with all ligands,leading to pairing of electrons.Thus,the complex is diamagnetic $(m.m. = 0 \; B.M.)$.It exhibits geometrical isomerism due to the $Ma_2b_2c_2$ type structure.However,$fac$ and $mer$ isomerism is characteristic of octahedral complexes of the type $Ma_3b_3$,not $Ma_2b_2c_2$.Therefore,the unmatched characteristic is the $Fac.$ and $Mer.$ form.

The unmatched characteristic of the complex $[PdCl_2(H_2O)_2(NH_3)_2]^{2+}$ is:

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