Question
How is the presence of $SO_2$ detected?
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Answer
$SO_2$ is a colourless and pungent smelling gas. It can be detected with the help of potassium permanganate solution. When $SO_2$ is passed through an acidified potassium permanganate solution, it decolonizes the solution as it reduces. $\text{MnO}^-_4 \ \text{ions to} \text{Mn}^{2+} \ \text{ions}$$5\text{SO}_2+2\text{MnO}_4^-+2\text{H}_2\text{O}\rightarrow5\text{SO}^{2-}_4+4\text{H}^++2\text{Mn}^{2+}$
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