(i) What type of isomerism is shown by the complex [Ag(NH3)2][Ag(CN)2]?

(ii) On the basis of crystal field theory, write the electronic configuration for d4 ion if ΔO<P.


(iii) Write the hybridization and shape of [Ni(CN)4]2-. (Atomic number of Ni = 28)



(i) Type of isomerism shown by the complex [Ag(NH3)2][Ag(CN)2] is linkage isomerism because the ligand CN can be complexed as CN- or NC-. Linkage isomerism occurs due to presence of ambidentate ligands such as CN/NC or NO2/ONO.


(ii) Electronic configuration for d4 ion if ΔO<P will be t2g3eg1.


(iii) Ni is in +2 oxidation state in [Ni(CN)4]2–.


Electronic configuration of Ni+2= 4s0 3d8



In [Ni(CN)4]2–, strong ligands i.e. CN- are present. These are able to pair the two unpaired electrons in the d oribital and thus no unpaired electrons will be left. The hybridization and shape of [Ni(CN)4]2- will be dsp2 and square planar respectively.


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