The ratio of magnetic moments of Fe(III) & Co(ll) is

Options

A. `sqrt5 :sqrt7`
B. `sqrt(35) : sqrt(15)`
C. `7:3`
D. `sqrt(24) : sqrt(15)`

Answer

B

Explanation

`Fe^(3+)` has 5 unpaired `e^-, Co^(2+) ` has 3 unpaired `e^-`
`sqrt(n(n+2)) = sqrt(35) sqrt(n(n+2)) = sqrt(15)`