Analytical ChemistryHard
Question
Which of the following is not precipitated as sulphide by passing H2S in the presence of concentrated HCl ?
Options
A.Copper
B.Arsenic
C.Cadmium
D.Lead
Solution
Cd2+ + H2S → CdS↓ + 2H+, reaction is reversible; if the concentration of strong acid in the solution is above 0.5 M, precipitation is incomplete. Concentrated acid dissolves the precipitate for the same reason.
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