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Physical and Chemical Changes — Science STD 7 — Question

Gujarat BoardEnglish MediumSTD 7SciencePhysical and Chemical Changes1 Mark
Question
Explain how painting of an iron articles prevents it from rusting.
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Answer

For rusting the presence of both oxygen and water or water vapour is required. The coat of the paint prevents direct contact of iron with air and oxygen and thus prevents it from rusting.

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