Analytical ChemistryHard
Question
Which of the following pairs comprises the red precipitates ?
Options
A.Ag2CrO4 and Hg2CrO4
B.HgI2 and Pb2SCl2
C.BiOI and Cu2[Fe(CN)6]
D.(A) and (B) both
Solution
(A) Both are red precipitates
(B) 2Pb2+ + H2S (not in excess) + 2Cl- (from saturated KCl solution) → Pb2SCl2↓(red) + 2H+
Hg2+ + 2I- → HgI2 ↓ (red)
(C) BiOI↓ (orange) and Cu2[Fe(CN)6]↓ (brown)
(B) 2Pb2+ + H2S (not in excess) + 2Cl- (from saturated KCl solution) → Pb2SCl2↓(red) + 2H+
Hg2+ + 2I- → HgI2 ↓ (red)
(C) BiOI↓ (orange) and Cu2[Fe(CN)6]↓ (brown)
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