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Question

SO2 and CO2 both turn lime water (A) milky, SO2 also turns K2Cr2O7/H+ (B) green while O2 is soluble in pyrogallol (C) turning it black. These gases are to be detected in order by using these reagents. The order is :

A
(A), (B), (C)
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B
(B), (C), (A)
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C
(B), (A), (C)
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D
(A), (C), (B)
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Solution

The correct option is C (B), (A), (C)
The correct order is (B), (A), (C) or K2Cr2O7/H+, lime water and pyrogallol.
Only sulphur dioxide solution turns acidified potassium dichromatem green. Carbon dioxide and oxygen do not interfere in this. Among oxygen and carbon dioxide, only carbon dioxide turns lime wate milky. Oxygen does not interfere in this reaction.

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