Question

Yellow ammonium sulphide solution is a suitable reagent for the separation of :

• A. $HgS$ and $PbS$
• B. $PbS$ and $B{i}_2{S}_3$
• C. $B{i}_2{S}_3$ and $CuS$
• D. $CdS$ and $A{s}_2{S}_3$

Answer 1

Answer: (D)

The correct option is D $CdS$ and $A{s}_2{S}_3$
Yellow ammonium sulphide solution is a suitable reagent for the separation of $CdS\left(IIA\right)$ and $A{s}_2{S}_3\left(IIB\right)$. Yellow ammonium sulphide solution is used for the separation of group IIA and group IIB sulphides. Group IIA sulphides are insoluble whereas group IIB sulphides are soluble in Yellow ammonium sulphide solution.