Coordination Compounds - Result Question 47

####53. Which among the following is a paramagnetic complex?

[NEET Kar. 2013]

(a) [Mo(CO)6]

(b) [Co(NH3)6]3+

(c) [Pt(en)Cl2]

(d) [CoBr4]2−

(At. No. of Mo=42,Pt=78 )

Show Answer

Solution:

  1. (d) Co2+⇒[Ar]3d74s0, here, Br−is a weak field ligand so will not cause pairing of d-electrons in Co2+.

∴[CoBr4]2− will exhibit paramagnetic behaviour due to unpaired electrons.

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