Given below are two statements:
Statement (I): Viscosity of gases is greater than that of liquids.
Statement (II): Surface tension of a liquid decreases due to the presence of insoluble impurities.
In the light of the above statements, choose the most appropriate answer from the options given below:
Statement (I): Viscosity of gases is greater than that of liquids.
Statement (II): Surface tension of a liquid decreases due to the presence of insoluble impurities.
In the light of the above statements, choose the most appropriate answer from the options given below:
- Statement I is correct but Statement II is incorrect
- Statement I is incorrect but Statement II is correct
- Both Statement I and Statement II are incorrect
- Both Statement I and Statement II are correct
The Correct Option is B
Approach Solution - 1
Let's analyze each statement separately in terms of the physics concepts they involve:
- Statement I: Viscosity of gases is greater than that of liquids.
- Viscosity is a measure of a fluid's resistance to flow. Generally, liquids have a higher viscosity than gases. This is because in liquids, molecules are closer together and interact more strongly than in gases, where molecules are far apart and interactions are minimal.
- Therefore, this statement is incorrect.
- Statement II: Surface tension of a liquid decreases due to the presence of insoluble impurities.
- Surface tension is a physical property that represents the cohesive force at the surface of a liquid. The presence of insoluble impurities on the surface can disrupt the cohesive forces among the liquid molecules, reducing the surface tension.
- Hence, this statement is correct.
Combining both analyses, we find that Statement I is incorrect whereas Statement II is correct. Therefore, the most appropriate choice is:
The correct answer is: Statement I is incorrect but Statement II is correct.
Approach Solution -2
Step 1. Analysis of Statement (I): - Viscosity is a measure of a fluid’s resistance to flow. Generally, liquids have higher viscosity than gases because of stronger intermolecular forces in liquids. Therefore, Statement (I) is incorrect.
Step 2. Analysis of Statement (II): - Surface tension is influenced by impurities. Insoluble impurities generally decrease the surface tension of a liquid by disrupting cohesive forces at the surface. Thus, Statement (II) is correct.
Since Statement I is incorrect and Statement II is correct, the correct answer is (2).
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