Analytical ChemistryHard
Question
A substance on treatment with dilute H2SO4 liberates a colourless gas which produces (i) turbidity with baryta water and (ii) turns acidified dichromate solution green. The reaction indicates the presence of :
Options
A.CO32-
B.S2-
C.SO32-
D.NO2-
Solution
SO32- + Ba(OH)2 → BaSO3↓ (white) + 2OH-.
3SO2 + Cr2O72- + 2H+ → 2Cr3+ (green colour solution) + 3SO42- + H2O.
3SO2 + Cr2O72- + 2H+ → 2Cr3+ (green colour solution) + 3SO42- + H2O.
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