In which of the following reaction, dihydrogen acts as an oxidising agent?

C a + H_{2} \to

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H_{2} + O_{2} \to

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H_{2} + F_{2} \to

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C u O + H_{2} \to

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Solution

The correct option is A $C a + H_{2} \to$
As the calcium is having $2$ electrons more $(1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}, 3 p^{6}, 4 s^{2})$ than the inert gas configuration, so it can give its two electrons to two hydrogens leading to the formation of $C a H_{2}$ and cause oxidation in $C a$ .

$C a + H_{2} \to C a H_{2}$

Here, hydrogen is acting as the oxidising agent.

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