Question

The one that can exhibit the highest paramagnetic behavior among the following is:

• A. ${\left[\mathrm{Ti}{\left({\mathrm{NH}}_3\right)}_6\right]}^{+3}$
• B. ${\left[\mathrm{Co}{\left(\mathrm{OX}\right)}_2{\left(\mathrm{OH}\right)}_2\right]}^{-}$
• C. $\left[\mathrm{Pd}{\left(\mathrm{gly}\right)}_2\right]$
• D. ${\left[\mathrm{Fe}\left(\mathrm{en}\right)\left(\mathrm{bpy}\right){\left({\mathrm{NH}}_3\right)}_2\right]}^{+2}$

Answer 1

The correct option is B

${\left[\mathrm{Co}{\left(\mathrm{OX}\right)}_2{\left(\mathrm{OH}\right)}_2\right]}^{-}$

The explanation for the correct option:

B: ${\left[\mathrm{Co}{\left(\mathrm{OX}\right)}_2{\left(\mathrm{OH}\right)}_2\right]}^{-}$

Paramagnetic Material:

• When exposed to a magnetic field, paramagnetic materials have a propensity to become weakly magnetized in the direction of the magnetizing field.
• Permanent magnetic or dipole moments exist in paramagnetic materials.
• In contrast, materials tend to lose their magnetic properties when the applied field is removed.
• This is due to the fact that heat motion randomizes the electrons' spin orientations.

In case of ${\left[\mathrm{Co}{\left(\mathrm{OX}\right)}_2{\left(\mathrm{OH}\right)}_2\right]}^{-}$:

In the above diagram, the number of unpaired electron is more than the other.

Final Answer: Therefore, option B is the correct option.