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Question

Assertion :Galvanised iron does not rust. Reason: Zinc has more negative electrode potential than iron.


A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
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C
Assertion is correct but Reason is incorrect.
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D
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.
Galvanized iron is essentially iron that's been coated with a protective zinc layer on the outside. 
Zinc metal which has a more negative electrode potential than iron, will provide electrons in preference of the iron, and therefore corrode first. Only when all the zinc has been oxidized, the iron start to rust.
Hence, Both Assertion and Reason are correct and Reason is the correct explanation for Assertion. Option A is correct.

Chemistry
NCERT
Standard XII

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