First slide
Sidgwick's theory
Question

Effective atomic number of central atom in  Pt(en)H2OCl3Cl Complex is 

Moderate
Solution

  Pt(en)H2OCl3Cl For this,

EAN = Central atom, atomic number- Oxidation number + 2 X number of ligands

EAN = 78-4 +2 (6) =86

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