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.

विकल्प

• 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.

Answer 1

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.