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(C) An oxidising agent is a substance that gains electrons or causes the oxidation of another substance,while itself undergoing reduction. In the reac

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$Ca$ to give $CaH_2$

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(C) An oxidising agent is a substance that gains electrons or causes the oxidation of another substance,while itself undergoing reduction. In the reaction $Ca + H_2 \rightarrow CaH_2$,the oxidation state of $Ca$ changes from $0$ to $+2$ (oxidation),and the oxidation state of $H$ changes from $0$ to $-1$ (reduction). Since hydrogen is reduced in this reaction,it acts as an oxidising agent. In the other options ($N_2$,$Br_2$,and $S$),hydrogen is oxidised from $0$ to $+1$,acting as a reducing agent.

Hydrogen behaves as an oxidising agent when it reacts with

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