Question

Which of the following cations is not paramagnetic?

• A. $S{c}^{3+}\left(aq\right)$
• B. $T{i}^{3+}\left(aq\right)$
• C. $V^{3+}\left(aq\right)$
• D. $C{r}^{3+}\left(aq\right)$

Answer 1

Answer: (A)

$S{c}^{3+}\left(aq\right)$

Ions with all paired electrons are diamagnetic.
$S{c}^{3+}-\left[Ar\right]$
$V^{3+}-\left[Ar\right]3d^2$
$T{i}^{3+}-\left[Ar\right]3d^1$
$C{r}^{3+}-\left[Ar\right]3d^3$
Hence, $S{c}^{3+}$ is diamagnetic, i.e, not paramagnetic.