Rusting of iron requires which two chemicals in contact with the metal?

Question

Accepted Answer

C. {'text': 'Water and oxygen', 'label': 'C'}

1. Corrosion is an electrochemical process.
2. Rusting occurs when iron is exposed to moisture (H₂O) and oxygen (O₂).
3. Iron acts as anode: Fe → Fe²⁺ + 2e⁻.
4. Oxygen at cathode: O₂ + 4H⁺ + 4e⁻ → 2H₂O; overall product is hydrated Fe₂O₃ (rust).
_Source: NCERT Class 12 Chemistry, Unit 3 "Electrochemistry", §3.8_

Answer

{'text': 'Oxygen and hydrogen only', 'label': 'A'}

Answer

{'text': 'Chlorine and nitrogen', 'label': 'B'}

Answer

{'text': 'Only nitrogen from air', 'label': 'D'}