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Werner's theory

According to werner theory Duel valency of central atom in  Pt(en)H2OCl3Cl Complex is 


 The ligand satisfy primary and secondary valency is called duel valency, that means ligand involved in calculation of primary and secondary valency. Hence 3 Cl- act as primary and secondary valency in given complex Pt(en)H2OCl3Cl , so duel valency  of  Pt(en)H2OCl3Cl Complex is 3

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