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A spin only magnetic moment of 1.73BM is...

A spin only magnetic moment of `1.73BM` is shown by :
(Atomic Nos=Fe=26, `Co=27`, `Ni=28` , `Cu=29`) [ N i ( C N ) 4 ] 2 − [ F e F 6 ] 3 − [ C u ( N H 3 ) 4 ] 2 + [ C o C l 6 ] 4 −

A

`[Ni(CN)_(4)]^(2-)`

B

`[FeF_(6)]^(3-)`

C

`[Cu(NH_(3))_(4)]^(2+)`

D

`[CoCl_(6)]^(4-)`

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