Chemistry

Problem

\text{Hg}^{2+}

when reacts with

\text{H}_2\text{S}

, black ppt. (A) formed which when reacts with

\text{Na}_2\text{S}

followed by filtration leaving behind black ppt. (B). The filtrate with

\text{H}^+

gives black ppt. (C). A, B and C are: a.

\text{Hg}_2\text{S}, \text{Hg}, \text{HgS}

\text{Hg} + \text{HgS}, \text{HgS}, \text{Hg}

\text{Hg} + \text{HgS}, \text{Hg}, \text{HgS}

\text{Hg}_2\text{S}, \text{HgS}, \text{Hg}