Question

The total number of cationic radicals that give black precipitate with $H_{2}S$ in acid solution is :
$P{b}^{2+},Z{n}^{2+},C{u}^{2+},M{n}^{2+},H{g}^{2+},C{r}^{3+},C{d}^{2+}$

Answer 1

Answer: 3

PbS, CuS and HgS are black precipitates.