Question

Which of the following has largest paramagnetism?

• A. $\lbrack Cr(H_{2}O)_{6}\rbrack^{3 +}$
• B. $\lbrack Fe(H_{2}O)_{6}\rbrack^{2 +}$
• C. $\lbrack Cu(H_{2}O)_{6}\rbrack^{2 +}$
• D. $\lbrack Zn(H_{2}O)_{2}\rbrack^{2 +}$

Answer 1

Answer: (B)

$\lbrack Fe(H_{2}O)_{6}\rbrack^{2 +}$

Answer 2

More the number of unpaired electrons, higher is it 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.