In which of the following reactions does hydrogen act as an oxidizing agent?
Correct answer: C. 2Na + H2 → 2NaH
- A. H₂ + F₂ → 2HF
- B. H₂ + Cl₂ → 2HCl
- C. 2Na + H2 → 2NaH
- D. CuO + H₂ → Cu + H₂O
Explanation
An oxidizing agent is a substance that gets reduced (gains electrons). In the reaction with sodium, hydrogen goes from an oxidation state of 0 to -1 in the hydride ion (H⁻). This gain of electrons means hydrogen has been reduced and has acted as the oxidizing agent.
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Electrochemistry describes electron transfer through oxidation and reduction, identifies oxidizing and reducing agents, and applies oxidation numbers to balance redox equations. It also covers electrode potential and the standard hydrogen electrode, which provides the reference for comparing the reduction tendencies of other electrodes.
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