Lead
(Pb2+), zinc
(Zn2+), silver
(Ag+)can be precipitated by
HCl and
H2S.
Hence, answer will be none of the above.
(a) Lead cation react with hydrochloric acid to give white ppt. of lead chloride.
Pb2++HCl⟶| PbCl2 |
| (Whiteppt.)Leadchloride |
↓ Lead cation reacts with hydrogen sulphide to form insoluble ppt. of lead sulphide.
Pb2++H2S⟶↓ (b) Zinc cation react with
HCl to give white ppt. of zinc chloride.
Zn2++HCl⟶↓ Zinc cation reacts with
H2S to give yellowish ppt. of zinc sulphide.
Zn2++H2S⟶↓ (c) Silver cation reacts with hydrochloric acid to give white ppt. of
AgCl (silver chloride).
Ag++HCl⟶| AgCl |
| (Whiteppt.)Silverchloride |
↓ Silver cation react with hydrogen sulphide to form black colour ppt. of
Ag2mS (silver sulphide).
Ag++H2S⟶↓