In which of the following reactions does...

In which of the following reactions does dihydrogen act as oxidising agent ?

`Ca+H_(2)to`

`H_(2)+O_(2)to`

`H_(2)+F_(2)to`

`CuO+H_(2)to`

Verified by Experts

The correct Answer is:

`Ca+H_(2)toCaH_(2)`. H changes oxidation number from 0 to -1. Hence it is oxidising `Ca^(0)` to `Ca^(2+)`.

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