the metal develops a protective layer over its surface by reaction with air in gold,platinum,silver,aluminium
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galvanisation I think I am right
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ANSWER:-
➡️Magnesium is a very reactive metal,so when usually exposed to air it reacts with oxygen and
➡️a layer of magnesium oxide is deposited on it.
➡️Magnesium oxide is quite stable, so prevents further reaction with oxygen.
➡️2Mg + O2 → 2MgO⬅️
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