Science, asked by rahulkumar84, 1 year ago

help me any one I don't know

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gracydhruti: which number???

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Answered by ravitejakarakapd8nf4

20.

Actually there are 4 things necessary. Iron (Fe) or iron containing metals along with oxygen are essential. Iron and steel rust when they come into contact with water and oxygen. Both water and oxygen are needed for rusting to occur.

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