Three pins made of copper, aluminium and iron respectively are kept i moist air for several days.The pin that that will rust is

a)copper b)aluminium c)iron d)all

All these rust at the same rate as most metals, like Iron, Aluminum, etc , are more reactive , so they corrode faster.

so answer is d)

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{d} because they all are metals . metals get rust when come contact with moist air...

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