Metal can be prevented from rusting by

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(A) Rusting of iron is an electrochemical process. To prevent rusting,iron is connected to a more electropositive metal (like $Zn$ or $Mg$). Since the

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Connecting iron to more electropositive metal $-$ a case of cathodic protection

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(A) Rusting of iron is an electrochemical process. To prevent rusting,iron is connected to a more electropositive metal (like $Zn$ or $Mg$). Since the more electropositive metal acts as an anode and undergoes oxidation,the iron object acts as a cathode and is protected from corrosion. This method is known as cathodic protection.

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