Question

Select the correct option, among $Sc(III)$, $Ti(IV)$, $Pd(II)$ and $Cu(II)$ ions

• A. all are paramagnetic
• B. all are diamagnetic
• C. $Sc(III)$, $Ti(IV)$ are paramagnetic and $Pd(III)$, $Cu (Il)$ are diamagnetic
• D. $Sc(III)$, $Ti(IV)$ are diamagnetic and $Pd(II)$, $Cu(II)$ are paramagnetic

Answer 1

Answer: (D)

$\left.SC ^{3+}\left([ Ar ] 3 d ^{0}\right)\right] \rightarrow$ since no unpaired electrons so diamagnetic
$\left.Ti ^{4+}\left([ Ar ] 3 d ^{0}\right) \right] \rightarrow$ since no unpaired electrons so diamagnetic
$\left.Pd ^{2+}\left([ Kr ] 4 d ^{8}\right)\right] \rightarrow$ since there is unpaired electrons so paramagnetic
$\left.Cu ^{2+}\left([ Ar ] 3 d ^{9}\right)\right] \rightarrow$ since there is unpaired electrons so paramagnetic.