Q. The complex ion which has the highest magnetic moment among the following is
A) $\left\lbrack {CoF}_{6} \right\rbrack^{3 -}$
B) $\left\lbrack Co\left( {NH}_{3} \right)_{6} \right\rbrack^{3 +}$
C) $\left\lbrack Ni\left( {NH}_{3} \right)_{4} \right\rbrack^{2 +}$
D) $\left\lbrack Ni(CN)_{4} \right\rbrack^{2 -}$
Explanation
(a)
In $\left\lbrack {CoF}_{6} \right\rbrack^{3 -}\ complex\ ion\ {Co}^{3 +}\ is\ {sp}^{3}\ d^{2}\ hybridized.F^{-}$ is weak ligand and cannot pair up the d -electrons so, complex is high spin. Due to four unpaired electrons it is highly paramagnetic.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.