Assertion :Fe is protected from corrosion by connecting Mg metal with it. Reason: Fe acts as cathode and Mg as anode which gradually disappears.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Corrosion of a metal is prevented by applying the protective coating (such as grease, paint or metal coatings) on its (metals) surface. In case of iron, this coating is done in two ways: (i) electrolysis ( $C r, N i$ , and $C d$ coating) (ii) dipping iron objects in a molten metal ( $Z n$ and $S n$ coating). Use of zinc coating to protect iron is called Galvanisation.
Cathodic protection. In this method, a plate of reactive metal ( $Z n$ or $M g$ ) is burried beside the iron pipe or tank and connected to it by wires. Here iron becomes cathode and more reactive metal becomes anode. The reactive metal anode is sacrificed to protect the iron. Since these reactive metal plates are oxidised quickly, they are replaced from time to time.

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