Answer :

IUPAC name of the complex [Cr(NH3)4Cl2]+ is Tetraaminedichlorochromium(iii).
In the above compound, NH3 ligand and Cl2 are present as ligand and there are 4 NH3 ligands are present and 2 Chlorine ligands are present so the prefix will be Tetra amine for the amine group and dichloro for the chlorine group and Cr acts as the central atom. So, it will be in the suffix.
The overall charge on Cr = +3
 (O. No. of Cr is x, O. No. of Chlorine is -1 and the charge on while sphere is +1,
    So, x-2 = +1, x= +3).
Thus, the IUPAC name of the given compound is Tetraaminedichlorochromium(iii).

Two geometrical isomers exist for this complex, these are trans-isomer and cis-isomer


(i) [Co(NH3)5ONO]Cl2,

Here, Cobalt will act as central atom whereas other ions NH3, ONO will act as ligand.

(ii) K2[Ni(CN)4],

Here, Ni will act as central atom whereas CN- ion will act as ligand.

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