Question

Predict the number of unpaired electrons in the square planar `[Pt(CN)_4]^(2-)` ion.
A. Zero
B. 1
C. 4
D. 6

Answer 1

Correct Answer - A
Outer electronic configuration of Pt is `5d^(9) 6s^(1)` . Outer electronic configuration of `Pt^(2+)` is `5d^(8)`. As `CN^(-)` is strong field ligand, so pairing will take place.