Ncert Exercises & Solutions

Given below are two statements:

Assertion (A):	Liquids tend to have a maximum number of molecules at their surface.
Reason (R):	Small liquid drops have a spherical shape.

1.	Both (A) and (R) are true and (R) is the correct explanation of (A).
2.	Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.	(A) is true but (R) is false.
4.	(A) is false but (R) is true.

Hint: Surface tension

Liquids tend to minimize their surface area. The molecules on the surface experience a net downward force and have more energy than the molecules in the bulk, which do not experience any net force. Therefore, liquids tend to have a minimum number of molecules at their surface.

Hence, the Assertion is false but the reason is true.

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