Among the following ions which has the highest paramagntism ? .

Options

A. `[Cr(H_(2)O)_(6)]^(3+)`
B. `[Fe(H_(2)O)_(6)]^(2+)`
C. `[Cu(H_(2)O)_(6)]^(2+)`
D. `[Zn(H_(2)O)_(6)]^(2+)`

Answer

b

Explanation

`[Co(H_(2)O)_(6)]^(3+) Cr(Z =24) implies 3d^(5) 4s^(1)`
There are three unpaired electrons
(ii) `[Fe(H_(2)O)_(6)]_(2)` has the maximum number of unpaired electrons, therefore the highest degree of paramagnetism
(iv) `[Cu(H_(2)O)_(6)^(2+) , Cu(Zn =29)implies3d^(10) 4d^(1), Cu^(2+) = 3d^(9)`
There is unpaired electrons
(v) `[Zn(H_(2)O)_(6)]^(2+),Zn (z =30) implies 3d^(10) 4s^(2) , Zn^(2+) =3d^(10)`
Threr are no unpaired electrons



.