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

(a) $HgS$ and $PbS$
(b) $PbS$ and $Bi_2S_3$
(c) $Bi_2S_3$ and $CuS$
(d) $CdS$ and $As_2S_3$
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Answer: $CdS$ and $As_2S_3$
Since $CdS$ belongs to II A group and $As_2S_3$ belongs to II B group, they can be separated with yellow ammonium sulphide as only II B group sulphides dissolve in yellow ammoium sulphide.
answered Jan 26, 2014 by mosymeow_1
edited Jan 29, 2014 by mosymeow_1
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