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Question

How the presence of SO2 is detected?


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Solution

Detection of SO2:

  • SO2 is known to be a colorless and pungent-smelling gas.
  • It can be detected by using a Potassium permanganate solution.
  • When SO2 is made to pass through an acidified Potassium permanganate solution having a pink-violate color, it decolorizes the solution as it reduces MnO4ions to Mn2+ ions giving out a suffocating smell that indicates its presence.
  • The balanced chemical reaction for the above reaction can be given as;

5SO2(g)(SulferDioxide)+2MnO4-(Potassiumpermanganateion)(pink-Violate)+2H2O(l)(Water)5SO42-(Sufateion)+4H+Hydrogenion+2Mn2+(Manganateion)(colorless)

Therefore, in the above way, we can detect the presence of the gas SO2 gas.


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