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99 Percentile Qs Bank for JEE MainChemistryRedox Reactions

In which of the following transformations, oxygen is not the reducing agent?

Options

  1. AAg 2 O ⟶ 2 Ag + 1 2 O 2
  2. B4 NH 3 + 3 O 2 ⟶ 2 N 2 + 6 H 2 O
  3. C2 F 2 + 2 H 2 O ⟶ + 4 HF + H 2 O
  4. DAgNO 3 + H 2 O 2 ⟶ 2 Ag + 2 HNO 3 + O 2

Correct answer

B. 4 NH 3 + 3 O 2 ⟶ 2 N 2 + 6 H 2 O

Step-by-step solution

A reducing agent oxidises itself or liberates electrons for other reagents. In the oxidation reaction, the oxidation number increases. In this reaction: 4   NH 3 + 3 O 2 → 2 N 2 + 6 H 2 O The oxidation number of oxygen in O 2 is zero and in H 2 O oxidation number of oxygen is - 2 . Oxygen is reduced, so O 2 acts as an oxidising agent and does not act as reducing agent. Ag 2 O → 2 Ag + 1 2 O 2 In this reaction, oxidation number of oxygen changes from - 2 to 0 . Here, oxidation takes place and oxygen

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