Reaction Analysis: Redox States and Chemical Behavior

Steps:

• Calculate oxidation state of N: -3 in NH3, 0 in N2 (increase indicates oxidation).
• Calculate oxidation state of Cl: 0 in Cl2, -1 in HCl (decrease indicates reduction).
• Examine reaction products: Formation of HCl suggests acid-base interaction where NH3 acts as proton acceptor.
• Evaluate statements against definitions of reduction, oxidation, and base behavior.

Why C is correct:

• Ammonia (NH3) behaves as a base by accepting H+ ions, consistent with Lewis/Brønsted-Lowry definition, leading to HCl formation.

Why the others are wrong:

• A: Nitrogen is oxidized (state from -3 to 0), not reduced.
• B: Chlorine is reduced (state from 0 to -1), not oxidized.
• D: Not enough information (choice incomplete).

Final answer: C