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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 :

This question was previously asked in
CUET PG 2026 Agri-Business Management Question Paper (25-Mar-2026) (Shift 2)
The correct answer is
Both (A) and (R) are correct and (R) is the correct explanation of (A)

Analysis of Assertion (A) and Reason (R)

The question asks to evaluate two statements about iron rusting:

  • Assertion (A): Iron rusts faster in moist air.
  • Reason (R): Moisture accelerates the oxidation process.

Evaluating Assertion (A)

Iron rusting is the oxidation of iron, forming iron oxides (commonly known as rust). This process requires oxygen and water. In the presence of moisture (water vapor or liquid water), the electrochemical reactions that lead to rusting are facilitated. Therefore, Assertion (A) is correct because iron does indeed rust more quickly in moist air compared to dry air.

Evaluating Reason (R)

The oxidation process, specifically the rusting of iron, involves electrochemical cells. Water acts as an electrolyte, allowing ions to move between the anodic and cathodic sites on the iron surface. It also participates directly in some reactions. This electrochemical pathway significantly speeds up the overall oxidation compared to a purely dry environment. Thus, Reason (R) is correct.

Relationship between Assertion (A) and Reason (R)

Reason (R) provides the scientific explanation for why Assertion (A) is true. Moisture accelerates the electrochemical oxidation process, which is the direct cause of iron rusting faster in humid conditions. Therefore, Reason (R) is the correct explanation of Assertion (A).

Conclusion

Based on the analysis, both Assertion (A) and Reason (R) are correct statements, and Reason (R) accurately explains Assertion (A).

The correct option is the one that states: Both (A) and (R) are correct and (R) is the correct explanation of (A).

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