Question

The aqueous solution of the salt will colored in the case of:

• A. $Zn{\left({NO}_3\right)}_2$
• B. $Li{NO}_3$
• C. $Co{\left({NO}_3\right)}_2$
• D. $Cr{Cl}_3$

Answer 1

Answer: (C), (D)

$Co{\left({NO}_3\right)}_2$
$Cr{Cl}_3$

$C{o}^{2+}$ = $3d^7$

$C{r}^{3+}$ = $3d^3$

$C{o}^{2+}$ and $C{r}^{3+}$ will have unpaired electrons and hence are expected to have aqueous solution of the salt colored.