The secondary valency of Pt in \([Pt(en)_2Cl_2]^{2+}\) is
Show Hint
- 6
- 5
- 4
- 2
The Correct Option is A
Solution and Explanation
Secondary valency is the coordination number of the central metal, that is, the total number of ligand donor atoms directly bonded to the metal.
Step 1:
'en' (ethylenediamine) is a bidentate ligand, so each en donates 2 atoms. Two en ligands donate \(2 \times 2 = 4\).
Step 2:
Two \(Cl\) ligands donate 2 more. Total coordination number = \(4 + 2 = 6\).
Answer: Option (A) 6.
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