1.

The complex showing a spin-only magnetic moment of 2,82 B.M. is

Answer»

 `Ni(CO)_(4)`
 `(NiCI_(4)]^(2-)`
`Ni(PPh_(3))_(4)`
 `[Ni(CN)_(4)^(2-)`

Solution :`Nicl_(4)]^(`2-), O.S. of Ni = +2`
`Ni(28) = 3d^(8) 4s^(2)`
`Ni^(+2) = 3d^(8) `

No. of unpaired electrons =2
MAGNETIC moment `MU = 2.82 BM`


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