Q. Which has maximum paramagnetic character?
A) $\left\lbrack Fe(CN)_{6} \right\rbrack^{4 -}$
B) $\left\lbrack Cu\left( H_{2}O \right)_{4} \right\rbrack^{2 +}$
C) $\left\lbrack Cu\left( {NH}_{3} \right)_{4} \right\rbrack^{2 +}$
D) $\left\lbrack Mn\left( H_{2}O \right)_{6} \right\rbrack^{2 +}$
Explanation
(d)
Paramagnetic character $\propto$ number of unpaired electrons.
_{25}Mn^{2+} ion has maximum unpaired (five unpaired electrons)
electrons. So, $\left\lbrack Mn\left( H_{2}O \right)_{6} \right\rbrack^{2 +}$ is most paramagnetic.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.