Among the following ions, which one has the highest paramagnetism?

Options

A. (a) `[Cr(H_2O)_6]^(3+)`
B. (b) `[Fe(H_2O)_6]^(2+)`
C. (c) `[Cu(H_2O)_6]^(2+)`
D. (d) `[Zn(H_2O)_6]^(2+)`

Answer

B

Explanation

The compound with highest no. of unpaired electrons has highest paramagnetism.