Question

Select the coloured and paramagnetic ions

• A. $C{u}^{+},Z{n}^{2+},C{d}^{2+}$
• B. $S{c}^{3+},T{i}^{4+},V^{5+}$
• C. $C{u}^{2+},C{r}^{+},M{n}^{2\mid }$
• D. $N{i}^{2+},C{u}^{+},H{g}^{2+}$

Answer 1

Answer: (C)

Ion is coloured if there are unpaired electrons in $d$-suborbit
Paramagnetic nature is also due to unpaired electrons
Thus, every coloured ion is also paramagnetic
$C{u}^{2+}=[Ar]3d^9$ one unpaired electron in $3d$
$C{r}^{+}=[Ar]3d^5$; five unpaired
$M{n}^{2+}=[Ar]3d^5$ electrons in $3d$