Analytical ChemistryHard
Question
SO2 and CO2 both turn lime water (X) milky, SO2 also turns K2Cr2O7 /H+ (Y) green while O2 is soluble in pyrogallol (Z) turning it black. These gases are to be detected in order by using these reagents. The order is:
Options
A.(X), (Y), (Z)
B.(Y), (X), (Z)
C.(X), (Z), (Y)
D.The correct order cannot be predicted.
Solution
(i) Cr2O72- + 3SO2 + 2H+ → 2Cr3+ (green) + 3SO42- + H2O ; CO2 and O2 do not give reactions with acidified K2Cr2O7.
(ii) Ca(OH)2 + CO2 → CaCO3 (white) + H2O ; O2 does not give reaction with acidified K2Cr2O7.
(iii) O2 dissolves in pyrogallol.
(ii) Ca(OH)2 + CO2 → CaCO3 (white) + H2O ; O2 does not give reaction with acidified K2Cr2O7.
(iii) O2 dissolves in pyrogallol.
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