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GK QUESTION#3350

For the reaction 4NH₃(g) + 5O₂(g) → 4NO(g) + 6H₂O(g), which statements are true?

(i) Nitrogen is oxidised.

(ii) Oxygen is oxidised.

(iii) Nitrogen is reduced.

(iv) Oxygen is reduced.

  1. A(i) and (iv)Correct answer
  2. B(i) and (ii)
  3. C(iii) and (iv)
  4. D(ii) and (iii)
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Answer

A. (i) and (iv)

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Explanation

Nitrogen changes from oxidation number −3 in NH₃ to +2 in NO, so it is oxidised. Oxygen changes from 0 in O₂ to −2 in the products, so it is reduced. The correct statements are (i) and (iv). Ammonia is the reducing agent and oxygen the oxidising agent.

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