Chemistry - Salt Analysis Question with Solution | TestHub
(Antimony trisulphide): This sulphide is typically orange in colour.Find the number of yellow colour sulphide(s) in the following :-
CdS, , , , , ZnS, PbS
Answer:
Solution:
Explain question: Finding the number of yellow-colored sulfides.
Concept:
Yellow ammonium sulfide (YAS) is used in qualitative analysis to separate the sulfides of Group II B (Cu, Cd, Hg) and Group IV (As, Sb, Sn).
Sulfides of As, Sb, and Sn dissolve in YAS due to the formation of thio-salts, but sulfides of Group II B (e.g., CuS, CdS, HgS) do not.
Solution:
CdS (Cadmium sulfide): Known as cadmium yellow, it is a bright yellow pigment.
Sb₂S₃ (Antimony trisulfide): This sulfide is typically orange in color.
As₂S₃ (Arsenic trisulfide): Described as a dark yellow solid.
As₂S₅ (Arsenic pentasulfide): It is a bright yellow solid.
SnS₂ (Tin disulfide): This is a golden yellow compound.
ZnS (Zinc sulfide): The pure form is white and used as a white pigment.
PbS (Lead sulfide): This is black in color.
Final Answer: Option (4)