Question

How many out of the following has more paramagnetic character than $Ti^{2 +}$ ion? $Sc^{3 +},Cr^{2 +},Co^{2 +},Fe^{2 +},Mn^{2 +},Cu^{2 +}$

Answer 1

Paramagnetism arises due to the presence of unpaired electrons. As the number of unpaired electrons increases, the magnetic moment increases and hence the paramagnetic character also increases.
$Ti^{2 +}\Rightarrow 3d^{2}\Rightarrow 2$ unpaired $e$
$Sc^{3 \star}\Rightarrow 3d^{0}\Rightarrow 0$ unpaired $e$
$Cr^{2 +}\Rightarrow 3d^{4}\Rightarrow 4$ unpaired $e$
$Co^{2 +}\Rightarrow 3d^{7}\Rightarrow 3$ unpaired $e$
$Fe^{2 \star}\Rightarrow 3d^{6}\Rightarrow 4$ unpaired $e$
$Mn^{2 +}\Rightarrow 3d^{5}\Rightarrow 5$ unpaired $e$
$Cu^{2 +}\Rightarrow 3d^{9}\Rightarrow 1$ unpaired $e$
$Cr^{2 +},Co^{2 +},Fe^{2 +}$ and $Mn^{2 +}$
have more paramagnetic character than $Ti^{2 +}$ ion.