Question
Which of the following are oxidation reactions? I. Rusting of iron II. Burning of fuel III. Rancidity of oils and fats IV. Browning of fruits Select the correct answer using the code given below.
NDA
General Ability
General Science
2026
NDA 2026 (Phase 1)
NDA General Ability Question (2026) — Solution
Options
- A. I, II and III only
- B. I, II and IV only
- C. III and IV only
- D. I, II, III and IV
Answer
D. I, II, III and IV
Step-by-step solution
Rusting of iron involves the reaction of iron with oxygen and moisture to form hydrated iron(III) oxide, which is an oxidation process. Burning of fuel is a combustion reaction where the fuel reacts with oxygen, making it an oxidation reaction. Rancidity of oils and fats occurs due to the aerial oxidation of unsaturated fats and oils. Browning of fruits is caused by the enzymatic oxidation of phenolic compounds present in the fruit when exposed to air. Therefore, all the given processes are oxidation reactions. Answer: I, II, III and IV
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