Analytical ChemistryHard
Question
Which of the following anion(s) evolve(s) reddish brown gas with concentrated H2SO4?
Options
A.Br-
B.NO3-
C.SO32-
D.I-
Solution
(A) Br- + H+ → HBr ↑ ; 2HBr + 2H2SO4 → Br2↑ (reddish brown) + SO2 ↑ + SO42- + H2O.
(B) 4NO3- + 2H2SO4 → → 4NO2 ↑ (reddish brown) + O2 ↑ + 2SO42- + 2H2O.
(C) SO32- + 2H+ → SO2 ↑ (colourless) + H2O.
(D) 3I- + 2H2SO4 → I3- ↑ (violet/purple) + SO42- + 2H2O + SO2.
(B) 4NO3- + 2H2SO4 → → 4NO2 ↑ (reddish brown) + O2 ↑ + 2SO42- + 2H2O.
(C) SO32- + 2H+ → SO2 ↑ (colourless) + H2O.
(D) 3I- + 2H2SO4 → I3- ↑ (violet/purple) + SO42- + 2H2O + SO2.
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