In which of the following reactions does H_2S | vedclass

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(A) An oxidizing agent is a substance that gains electrons and undergoes reduction,causing the oxidation of another substance.In the reaction $2HI + H

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$2HI + H_2SO_4 \rightarrow I_2 + SO_2 + 2H_2O$

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(A) An oxidizing agent is a substance that gains electrons and undergoes reduction,causing the oxidation of another substance.In the reaction $2HI + H_2SO_4 \rightarrow I_2 + SO_2 + 2H_2O$,the oxidation state of $I$ in $HI$ increases from $-1$ to $0$ (oxidation).The oxidation state of $S$ in $H_2SO_4$ decreases from $+6$ to $+4$ (reduction).Since $H_2SO_4$ undergoes reduction,it acts as an oxidizing agent.In the other reactions,$H_2SO_4$ acts as an acid (neutralization or displacement reaction) where no change in oxidation states occurs.

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

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