When a corroded metal object is rubbed by a sand paper then:
metal becomes thin
all of the above
outer corroded layer will be removed
outer metal surface is removed
A
metal becomes thin
B
outer corroded layer will be removed
C
all of the above
D
outer metal surface is removed
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Solution
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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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