Question
In the following redox reaction, which compound is acting as a reducing agent? N_2H_4 + 2H_2O_2 N_2 + 4H_2O
NDA
General Ability
General Science
2025
NDA 2025 (Phase 2)
NDA General Ability Question (2025) — Solution
Options
- A. H_2O_2
- B. N_2H_4
- C. N_2
- D. H_2O
Answer
B. N_2H_4
Step-by-step solution
In the given reaction, the oxidation state of nitrogen in N_2H_4 is -2 and it changes to 0 in N_2. Since the oxidation state of nitrogen increases, N_2H_4 undergoes oxidation. The oxidation state of oxygen in H_2O_2 is -1 and it changes to -2 in H_2O. Since the oxidation state of oxygen decreases, H_2O_2 undergoes reduction. The species that undergoes oxidation acts as a reducing agent. Therefore, N_2H_4 is the reducing agent. Answer: N_2H_4
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