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Which of the following statements is not correct about rusting of iron?

1. Dissolved acidic oxides SO 2 , NO 2 in water act as catalyst in the process of rusting.
2. Rusting of iron is envisaged as setting up of electrochemical cell on the surface of iron object.
3. When pH lies above 9 or 10, rusting of iron does not take place.
4. Coating of iron surface by tin prevents rusting, even if the tin coating is peeling off.

Correct answer: Coating of iron surface by tin prevents rusting, even if the tin coating is peeling off.

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