SELECT * FROM question_mgmt as q WHERE id=2039 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=3 AND subId=9 AND chapterId=62 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 12th chemistry The p-Block Elements how is the presence of so2 nbsp detected

Question:

How is the presence of SO2 detected?

Answer:

SO2 is a colourless and pungent smelling gas.

 

It can be detected with the help of potassium permanganate solution. When SO2 is passed through an acidified potassium permanganate solution, it decolonizes the solution as it reduces MnO4- ions to Mn2+ ions 

5SO2    +     2MnO4-     +   2H2O    →   5SO42-    +   4H+   +  2Mn2+


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