India Exam Junction
[PPSC PRINCIPAL, ITI (WOMEN) 2024]
21. Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: Physical weathering accelerates chemical weathering
Reason R: The smaller any physical object, the greater its surface area in relation to its volume for chemical reactions
In the light of the above statements, choose the most appropriate answer from the options given below
Both A and R are correct and R is the correct explanation of A
Both A and R are correct but R is NOT the correct explanation of A
A is correct but R is not correct
A is not correct but R is correct
Correct Answer :
Both A and R are correct and R is the correct explanation of A
Solution
- Assertion A: Physical weathering breaks rocks into smaller pieces, increasing the surface area available for chemical weathering. Hence, physical weathering accelerates chemical weathering.
- Reason R: As the size of an object decreases, its surface area relative to its volume increases, providing more area for chemical reactions to occur.
Since the increased surface area directly explains why physical weathering accelerates chemical weathering, R is the correct explanation of A.