How is the presence of SO_{2} detected? | vedclass

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(B) $SO_{2}$ is a colourless and pungent smelling gas.It can be detected with the help of acidified potassium permanganate solution. When $SO_{2}$ is

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By using acidified potassium permanganate solution

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(B) $SO_{2}$ is a colourless and pungent smelling gas.It can be detected with the help of acidified potassium permanganate solution. When $SO_{2}$ is passed through an acidified potassium permanganate solution,it decolourises the solution as it reduces $MnO_{4}^{-}$ ions to $Mn^{2+}$ ions.The chemical reaction is:$5SO_{2} + 2MnO_{4}^{-} + 2H_{2}O \longrightarrow 5SO_{4}^{2-} + 4H^{+} + 2Mn^{2+}$

How is the presence of $SO_{2}$ detected?

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