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In which of the following reactions does hydrogen act as a reducing agent?

Practice Questions

Q1
In which of the following reactions does hydrogen act as a reducing agent?
  1. H2 + Cl2 → 2HCl
  2. H2 + O2 → 2H2O
  3. H2 + CuO → Cu + H2O
  4. H2 + N2 → NH3

Questions & Step-by-Step Solutions

In which of the following reactions does hydrogen act as a reducing agent?
  • Step 1: Identify the reactants in the reaction: H2 (hydrogen) and CuO (copper(II) oxide).
  • Step 2: Understand what a reducing agent does: A reducing agent donates electrons to another substance, causing that substance to be reduced.
  • Step 3: Determine what happens to CuO in the reaction: CuO gains electrons from H2 and is converted to Cu (copper).
  • Step 4: Recognize that since H2 donates electrons to CuO, it is acting as a reducing agent.
  • Step 5: Conclude that in the reaction H2 + CuO → Cu + H2O, hydrogen reduces copper(II) oxide to copper.
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