Analytical ChemistryHard
Question
Which of the following statements is/are incorrect ?
Options
A.A filter paper moistened with cadmium acetate solution turns yellow, when brought in contact with H2S gas.
B.Both carbonate ions as well as bicarbonate ions in the solutions, give reddish-brown precipitate with mercury(II) chloride.
C.Sulphites in presence of zinc, reacts with dilute H2SO4 to liberate SO3 gas.
D.A filter paper moistened with KIO3 and starch turns blue in contact with SO2 vapours.
Solution
(A) Cd2+ (aq) + H2S (g) → CdS↓ (yellow) + 2H+ (aq)
(B) Co32- + 4Hg2+ + 3H2O → Hg4O3CO3 ↓ (reddish-brown) + 6H+
HCO3- (aq) does not give precipitate.
(C) SO32- + 3Zn + 8H+ → H2S ↑ + 3Zn2+ + 3H2O
(D) 5SO2 + 2IO3- + 4H2O → I2 + 5SO42- + 8H+
(B) Co32- + 4Hg2+ + 3H2O → Hg4O3CO3 ↓ (reddish-brown) + 6H+
HCO3- (aq) does not give precipitate.
(C) SO32- + 3Zn + 8H+ → H2S ↑ + 3Zn2+ + 3H2O
(D) 5SO2 + 2IO3- + 4H2O → I2 + 5SO42- + 8H+
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