1.

An ion `(Mn^(a+))` has the magnetic moment equal to `4.9` B.M` What is the value of (a) :

Answer» Correct Answer - 3
`:.` Magnetic moment ` sqrt(n( n + 2)) = 4.9`
` :. n =4` (where (n) no. ofunpared elctron 0
thus `Mn^(a+) ` ion has hour unpaired electron .
` ._(25) Mn^(3+) : 1s^2, 2^2 2p^6 . 3s^ 3p^2 3p^6 3d4`
` :. A=3` .


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