Which of the following has largest paramagnetism ?

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

More the number of unpaired electrons , higher is its paramagnetism .
`Cr^(3+) : 3d^(3) , Fe^(2+) : 3d^(6) , Cu^(2+) : 3d^(9) , Zn^(2+) : 3d^(10)`
`Fe^(2+)` has four unpaired electrons hence it shows highest paramagnetism .