$2 {CO}_{2} (g) + 2 H_{2} (g) - - \to 2 CO (g) + 2 H_{2} O (g)$
In this reaction gets oxidised and gets reduced.

{CO}_{2}

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H_{2}

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CO

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H_{2} O

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Solution

The correct option is B $H_{2}$
In the given reaction, when ${CO}_{2}$ is reacted with hydrogen, it reduces to $CO$ by losing an oxygen atom. Whereas, $H_{2}$ is oxidised as it gains an oxygen atom to form $H_{2} O$ .

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