Consider the complex separation of Group II sulphide precipitates. Which of the following reagents s — Qualitative and Quantitative Analysis Chemistry Question
Question
Consider the complex separation of Group II sulphide precipitates. Which of the following reagents selectively dissolves the sub-group IIB sulphides ($As_2S_3, Sb_2S_3, SnS_2$) while leaving sub-group IIA sulphides ($PbS, CuS, CdS$) as an insoluble residue?
Answer: C
💡 Solution & Explanation
Yellow Ammonium Sulphide (YAS) acts upon the amphoteric nature of the Group IIB metal sulphides, dissolving them to form soluble thio-complexes (like $[SnS_3]^{2-}$). Group IIA sulphides are not amphoteric towards sulphides and remain undissolved.
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