Rusting of iron requires the simultaneous presence of
A{'text': 'Only oxygen', 'label': 'A'}
B{'text': 'Only water', 'label': 'B'}
C{'text': 'Only hydrogen', 'label': 'C'}
D{'text': 'Water and oxygen', 'label': 'D'}
Answer & Solution
Correct answer: D. {'text': 'Water and oxygen', 'label': 'D'}
1. Rust is hydrated ferric oxide (Fe₂O₃·xH₂O).
2. Iron will not rust in dry air or air-free water.
3. Both moisture (H₂O) and oxygen (O₂) must be present.
4. This is why paint, oiling and galvanisation protect iron by keeping either component away.
_Source: NCERT Class 10 Science, Ch 3 "Metals and Non-metals", §3.3_
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