Question

The "spin-only" magnetic moment [in units of Bohr magneton, `(mu_B)`] or `Ni^(2+)` in aqueous solution would be :
(At no. `Ni = 28`).
A. 2.83
B. 4.9
C. 0
D. 1.73

Answer 1

Correct Answer - A
`Ni^(2+)` in aqueous solution means `[Ni(H_(2)O)_(6)]^(2+)` . The electronic configuration of

Total number of unpaired electron `=2`
`:. `Spin only magnetic moment of `Ni^(2+)`
`=2 sqrt(2(2+2))= 2 sqrt(2) = 2.83 B.M.`