Question

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Iron rusts faster in moist air.
Reason (R): Moisture accelerates the oxidation process. In the light of the above statements, choose the most appropriate answer from the options given below.

• A. Both (A) and (R) are correct and (R) is the correct explanation of (A).
• B. Both (A) and (R) are correct but (R) is not the correct explanation of (A).
• C. (A) is correct but (R) is not correct.
• D. (A) is not correct but (R) is correct.

Hint:

Remember that rusting requires both oxygen and moisture. Whenever moisture increases, the oxidation of iron generally becomes faster.

Answer 1

The Correct Option is A

Step 1: Understanding the Question:
This assertion-reason question tests basic scientific understanding of rusting and oxidation.

Step 2: Key Formula or Approach:
Rusting is the oxidation of iron in the presence of oxygen and moisture.

Step 3: Detailed Explanation:

• Assertion (A) is true because iron rusts more rapidly when moisture is present.

• Reason (R) is also true because water acts as a medium that facilitates the oxidation reaction.

• The reason directly explains the assertion.

• In dry air, rusting occurs much more slowly, while in moist conditions the process accelerates significantly.

• Therefore, both statements are true and the reason correctly explains the assertion.

Step 4: Final Answer:
(A) Both (A) and (R) are correct and (R) is the correct explanation of (A).