Assertion :Iron is protected from corrosion by connecting magnesium metal with it. Reason: Iron acts as cathode and magnesium 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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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Most anti-corrosion methods used to stop iron or steel rusting involve the exclusion of oxygen (in the air) and water i.e. some sort of barrier (other metals like Mg) is applied or formed on the surface of the metal to be protected.

Here, iron acts like cathode (gains electrons) whereas magnesium acts like anode(loss the electrons).

Therefore, both assertion and reason are correct and the reason is the correct explanation for the assertion.

Hence option B is correct.

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