In which of the following reactions does conc | vedclass

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(B) Concentrated $H_2SO_4$ acts as an oxidizing agent when it undergoes reduction itself.In reaction $(B)$,$H_2SO_4$ oxidizes $HI$ to $I_2$ and is its

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$2HI + H_2SO_4 	o I_2 + SO_2 + 2H_2O$

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(B) Concentrated $H_2SO_4$ acts as an oxidizing agent when it undergoes reduction itself.In reaction $(B)$,$H_2SO_4$ oxidizes $HI$ to $I_2$ and is itself reduced to $SO_2$.The oxidation state of sulfur in $H_2SO_4$ decreases from $+6$ to $+4$ in $SO_2$,confirming its role as an oxidizing agent.In the other reactions ($A$,$C$,and $D$),$H_2SO_4$ acts only as an acid,as there is no change in the oxidation states of the sulfur atom.

In which of the following reactions does concentrated $H_2SO_4$ act as an oxidizing agent?

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