Which of the following is oxidised by SO_2? | vedclass

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Question

(A) $SO_2$ acts as a reducing agent in the presence of strong oxidizing agents and as an oxidizing agent in the presence of strong reducing agents. $1

Vedclass · Accepted Answer

$Mg$

Vedclass · Answer

(A) $SO_2$ acts as a reducing agent in the presence of strong oxidizing agents and as an oxidizing agent in the presence of strong reducing agents. $1.$ $SO_2$ oxidizes $Mg$ to $MgO$: $SO_2 + 2Mg 	o 2MgO + S$. $2.$ $SO_2$ reduces $K_2Cr_2O_7$ (in acidic medium) to $Cr^{3+}$: $Cr_2O_7^{2-} + 3SO_2 + 2H^+ 	o 2Cr^{3+} + 3SO_4^{2-} + H_2O$. $3.$ $SO_2$ reduces $KMnO_4$ (in acidic medium) to $Mn^{2+}$: $2MnO_4^- + 5SO_2 + 2H_2O 	o 2Mn^{2+} + 5SO_4^{2-} + 4H^+$. Since $SO_2$ acts as an oxidizing agent only for $Mg$ and as a reducing agent for $K_2Cr_2O_7$ and $KMnO_4$,the correct answer is $A$.

Which of the following is oxidised by $SO_2$?

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