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Question
Assertion (A): When an iron object is left in dry air for a considerable time, it gets covered with a red-brown flaky substance called rust. This is called rusting of iron.
Reason (R): The eating up of metal objects by the action of air, moisture or a chemical (such as an acid) on their surface is called corrosion.
Options
Both A and R are true and R is correct explanation of the assertion.
Both A and R are true but R is not the correct explanation of the assertion.
A is true but R is false.
A is false but R is true.
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Solution
A is false but R is true.
Explanation:
Assertion (A) is completely incorrect since iron strictly requires the simultaneous presence of both oxygen and moisture to rust, meaning it will never form a red-brown layer if left exclusively in completely dry air, whereas Reason (R) is a scientifically true statement that perfectly defines the broader concept of corrosion as the degradation of metals by environmental agents.
