In which of these reactions hydrogen acts as an oxidizing agent?

Answer options

1. CuO + H2 → H2O + Cu
2. 2Na + H2 → 2NaH
3. F2 + H2 → 2HF
4. N2 + 3H2 → 2NH3
5. Cl2 + H2 → 2HCl

Correct answer

2Na + H2 → 2NaH

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