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Werner's theory

According to werner theory secondary valency of central atom in  Pt(en)2(H2O)ClCl3 Complex is 


 2 en (bidentate ligand) and Cl, 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)2(H2O)2Cl4 Complex is 6

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