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Question

Which reagent is used in qualitative testing for the presence of sulphur dioxide?

A
Sodium Chloride
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B
Iron (II) sulphate
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C
Vanadium (V) oxide
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D
Potassium permanganate
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Solution

The correct option is D Potassium permanganate
Acidified potassium permanganate is used to test the presence of SO2. A filter paper or cotton wool dipped in acidified KMnO4 is held over the gas, the former decolorizes, confirming the presence of gas.
2MnO4+5SO2+2H2O5SO24+2Mn2++4H+

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