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Werner's theory

According to werner theory secondary valency of central atom in  Pt(en)(H2O)2Cl2Cl2 Complex is 


en (bidentate ligand) and 2Cl, 2H2 ligands are directly donate the electron pair towards central metal atom Pt, so coordination number satisfy the secondary valency. Hence secondary valency  Pt(en)(H2O)2Cl2Cl2 Complex is 6

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