Statement I : When a capillary tube is dipped into a liquid, the liquid neither rises nor falls in the capillary. The contact angle may be 0∘0∘.Statement II : The contact angle between a solid and a liquid is a property of the material of the solid and liquid as well.In the light of the above statement, choose the correct answer from the options given below.JEE Main 2024 (05 Apr Shift 1)ABoth Statement I and Statement II are falseBBoth Statement I and Statement II are trueCStatement I is false but Statement II is trueDStatement I is true and Statement II is false
Question
Statement I : When a capillary tube is dipped into a liquid, the liquid neither rises nor falls in the capillary. The contact angle may be 0∘0∘.Statement II : The contact angle between a solid and a liquid is a property of the material of the solid and liquid as well.In the light of the above statement, choose the correct answer from the options given below.JEE Main 2024 (05 Apr Shift 1)ABoth Statement I and Statement II are falseBBoth Statement I and Statement II are trueCStatement I is false but Statement II is trueDStatement I is true and Statement II is false
Solution
The correct answer is C. Statement I is false but Statement II is true.
Explanation:
Statement I is false because when a capillary tube is dipped into a liquid, the liquid will either rise or fall in the capillary depending on the adhesive and cohesive forces. If the adhesive forces (between the liquid and the capillary tube material) are stronger, the liquid will rise in the capillary. If the cohesive forces (between the liquid molecules themselves) are stronger, the liquid will fall in the capillary. The contact angle being 0 degrees would mean that the liquid completely wets the surface, which would cause the liquid to rise in the capillary, not remain at the same level.
Statement II is true because the contact angle between a solid and a liquid is indeed a property of the materials of the solid and liquid. It depends on the adhesive and cohesive forces, which are determined by the properties of the materials. Different materials will have different levels of adhesion and cohesion, leading to different contact angles.
Similar Questions
Statement I : If a capillary tube is immersed first in cold water and then in hot water, the height of capillary rise will be smaller in hot water.Statement II : If a capillary tube is immersed first in cold water and then in hot water, the height of capillary rise will be smaller in cold water.In the light of the above statements, choose the most appropriate from the options given belowJEE Main 2024 (29 Jan Shift 1)ABoth Statement I and Statement II are trueBBoth Statement I and Statement II are falseCStatement I is true but Statement II is falseDStatement I is false but Statement II is true
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