First slide
Werner's theory

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


en (bidentate ligand) and 3Cl,H2 ligands are directly donate the electron pair towards central metal atom Pt, so coordination number satisfy the secondary valency. Hence secondary valency  Pt(en)H2OCl3Cl Complex is 6

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