Which of the following compounds will show magnetic moment of 1.72 BM ?

Options

A. `[Ni(CN)_(4)]^(2-)`
B. `[CoCl_(6)]^(4-)`
C. `[Cu(NH_(3))_(4)]^(2+)`
D. `TiCl_(4)`

Answer

C

Explanation

Cu has +2 oxidation state in `[Cu(NH_(3))_(4)]^(2+)`
Electronic configuration of `Cu^(2+)(Z=29)` is
`[Ar]^(18)3d^(9)4s^(0)`
Number of unpaired electrons (n) = 1
Magnetic moment = `sqrt(n(n+2))BM=sqrt(1(1+2))=1.73BM`