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How many of the following has 2.8 B.M. m...

How many of the following has 2.8 B.M. magnetic moment ?
`(a) [Ni(NH_(3))_(6)]Cl_(2)" "(b) K_(4)[NiCl_(6)]`
`(c ) K_(3)[Mn(CN)_(6)]" "(d) [NI(CO)_(4)]`
`(e ) [Ni(CN)_(4)]^(2-)" "(f) Hg[Co(SCN)_(4)]`
`(g) K_(3)[Fr(CN)_(6)]`

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The correct Answer is:
3
(a),(b),(c ) has 2 unpaired electrons. (f) has 3, (g) has 1 while (d),(e ) are diamagnetic.
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