Consider the complex separation of Group II sulphide precipitates. Which of the following reagents selectively dissolves the sub-group IIB sulphides () while leaving sub-group IIA sulphides () as an i

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?

Prashant Kotian · Accepted Answer

Correct answer: C. Yellow Ammonium Sulphide (YAS) acts upon the amphoteric nature of the Group IIB metal sulphides, dissolving them to form soluble thio-complexes (like ). Group IIA sulphides are not amphoteric towards sulphides and remain undissolved.

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