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

In the above reaction, which one of the following is oxidized?

C a

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C a H_{2}

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H_{2}

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None of these

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Solution

The correct option is A $C a$
The oxidation number of Ca increases from 0 to +2. Thus, Ca is oxidized.
The oxidation number of hydrogen decreases from 0 to -1. Thus hydrogen is reduced.

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