In which of the following reactions,hydrogen | vedclass

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(B) An oxidising agent itself undergoes reduction,meaning its oxidation number decreases. When $H_2$ is converted to the hydride ion $H^-$,it is reduc

Vedclass · Accepted Answer

With lithium to give lithium hydride

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(B) An oxidising agent itself undergoes reduction,meaning its oxidation number decreases. When $H_2$ is converted to the hydride ion $H^-$,it is reduced and acts as an oxidising agent.In the reaction with lithium,hydrogen acts as an oxidising agent:$H_2 + 2Li \rightarrow 2LiH$Here,the oxidation state of $H$ changes from $0$ to $-1$.In the other reactions,hydrogen acts as a reducing agent:$H_2 + I_2 \rightarrow 2HI$ ($H$ goes from $0$ to $+1$)$3H_2 + N_2 \rightarrow 2NH_3$ ($H$ goes from $0$ to $+1$)$H_2 + S \rightarrow H_2S$ ($H$ goes from $0$ to $+1$)

In which of the following reactions,hydrogen is acting as an oxidising agent?

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