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NDA 2 2025 GAT, question 104

Topic: Chemistry

Q104

In the following redox reaction, which compound is acting as a reducing agent ?

N2H4+2H2O2→N2+4H2ON_{2}H_{4}+2H_{2}O_{2}\to N_{2}+4H_{2}O

  1. (a) H2O2H_{2}O_{2}
  2. (b) N2H4N_{2}H_{4}Correct answer
  3. (c) N2N_{2}
  4. (d) H2OH_{2}O

Solution.

Answer: (b) N2H4N_{2}H_{4}

  1. In N₂H₄, nitrogen has oxidation number −2; in N₂ it is 0.
  2. Hydrazine therefore loses electrons and is oxidised, making it the reducing agent.
  3. Oxygen in peroxide goes from −1 to −2, confirming that peroxide is reduced.