The central atom of the complex ion is Pt which has a coordination number of 6 (2 pairs of chloride electrons, 4 pairs of electrons from 2 bidentate ethylenediammine).
Oxidation number of Pt (x):
The chlorido ligand is named before ethylenediammine, (en) is bidentate ligand thus the IUPAC name is: Dichloridobis(ethylenediammine)platinum(IV) ion.
(i) Cobalt is the central atom in complex ion and sulphate is the outer ion. As ammine is neutral the +3 charge on cobalt and -2 charge on sulphate ion is balanced by LCM of 6 charge transfer Two moles of complex ion and 3 moles of sulphate ion form the requires compound. Thus,
NOTE: Whenever we need to find the ion number try to balance the charge and net electron transfer between the outside ion and the complex ion by taking LCM.
(ii) Chromate is the central atom with oxidation state of +3. Trioxalate is a bidentate ligand and 6 electron pair are donated by 3 trioxalate ion. Since coordination complex is negative it is written later than potassium ion.
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