In which of the following reactions does hydrogen act as an oxidising agent:

H_{2} + F_{2} ⟶

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H_{2} + {S i C I}_{2} ⟶

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{N a}_{2} + H_{2} ⟶

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C u O + H_{2} ⟶

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Solution

The correct option is D ${N a}_{2} + H_{2} ⟶$
Reaction:
$2 N a + H_{2} ⟶ 2 N a H$
0 +1
here, it oxidises Na so it acts as oxidising agent.

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