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Which of the following is not precipitated as sulphide by passing $H_2S$ in the presence of conc. HCl?

(a) Copper
(b) Arsenic
(c) Cadmium
(d) Lead
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Answer: Cadmium
Solubility product of CdS is greater than the other sulphides of group II, it is therefore precipitated only on dilution and cannot be precipitated in conc. HCl.
answered Jan 26, 2014 by mosymeow_1
edited Jan 29, 2014 by mosymeow_1
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