Name the gas that can readily decolourise aci | vedclass

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(A) Sulfur dioxide $(SO_2)$ acts as a strong reducing agent.When $SO_2$ gas is passed through an acidified solution of potassium permanganate $(KMnO_4

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$SO_2$

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(A) Sulfur dioxide $(SO_2)$ acts as a strong reducing agent.When $SO_2$ gas is passed through an acidified solution of potassium permanganate $(KMnO_4)$,it reduces the purple-colored $Mn^{7+}$ ion to the colorless $Mn^{2+}$ ion.The balanced chemical equation is:$2KMnO_4 + 5SO_2 + 2H_2O \rightarrow K_2SO_4 + 2MnSO_4 + 2H_2SO_4$Since $MnSO_4$ is a colorless solution,the purple color of $KMnO_4$ disappears.

Name the gas that can readily decolourise acidified $KMnO_4$ solution.

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