(a). A transition metal cation `x^(3+)` has magnetic momen `sqrt(35)` BM. What is the atomic number of `x^(3+)`?
(b). Select the coloured ion and the ion having maximum

Magnetic moment (i). `Fe^(2+)`
(ii). `Cu^(+)`
(iii). `Sc^(3+) and` (iv) `Mn^(2+)`.

Explanation

(a). 26, `._(26)Feto3d^(6)4s^(2)`
`Fe^(3+)to3d^(5)4s^(0)`
`mu=sqrt(n(n+2))=sqrt(5xx7)=sqrt(35)`
(b).
Both these ions will be coloured and magnetic moment of `Mn^(2+)` will be greater.