The pair(s) of ions where both the ions are precipitated upon passing $\mathrm{H}_{2} \mathrm{~S}$ g

Question

The pair(s) of ions where both the ions are precipitated upon passing $\mathrm{H}_{2} \mathrm{~S}$ gas in presence of dilute HCl , is(are)\

Professor PC Thomas Classes · Answer

(c, d) : Group II radicals will get precipitated out upon passing $\mathrm{H}_{2} \mathrm{~S}$ gas in presence of dilute $\mathrm{HCl} . \mathrm{CuS}, \mathrm{PbS}, \mathrm{HgS}$ and $\mathrm{Bi}_{2} \mathrm{~S}_{3}$, black precipitates are obtained.