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Cathodic protection occurs when
a.iron is amalgamated with mercury.
b.iron is made amphoteric.
c.iron is painted to protect it from corrosion.
d.iron is tin-plated for use as a tin can.
e.iron is attached to a more active metal.

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Cathodic protection occurs when iron is attached to a more active metal. Cathodic protection is an anti-corrosion control technique used to control the corrosion of a metal surface by making it the passive site of an electrochemical cell. During this technique, the metal to be protected is connected to a more easily corroded metal  which later corrodes instead of the protected metal.






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