When a corroded metal object is rubbed by a sand paper then:

outer metal surface is removed

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metal becomes thin

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outer corroded layer will be removed

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all of the above

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Solution

The correct option is C outer corroded layer will be removed
The metals lose their shine and become dull when exposed to air for a long time. Due to the formation of oxides, when the surface is rubbed by a sand paper, then the outer corroded layer is removed.

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