Question

Which has maximum paramagnetic nature?

• A. [Cu(H2O)4]2+
• B. [Cu(NH3)4]2+
• C. [Mn(H2O)6]2+
• D. [Fe(CN)6]4–

Answer 1

Answer: (C)

$Mn(H2O)6$2+

Answer 2

(3) Mn2+, 3d5 configuration has 5 unpaired electrons.

In (4) Fe2+ (3d6) has no unpaired electrons because of strong field ligand (CN–), all electrons are paired.

In (1) and (2) Cu2+(3d9) has one unpaired electron.