Identify the species undergoing oxidation and reduction:
2Na(s) + H2(g)---- 2NaH(s)

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Solution

In the reaction given above, the oxidation state of Na is changing from 0 to +1. This indicates that it is undergoing oxidation here. The oxidation state of H2 is changing from 0 to -1. This indicates that it is undergoing reduction here.

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