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Q 2640080813.     (i) Draw the geometrical isomers of complex `[Co(en)_2Cl_2]^+`.
(ii) On the basis of crystal field theory, write the electronic configuration for `d^4` ion if `∆_0 > P`.
(iii) `[NiCl_4]^(2-)` is paramagnetic, while `[Ni(CO)_4]` is diamagnetic, though both are tetrahedral. Why? (Atomic number of Ni = 28)
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