Viscosity of a liquid________by increasing temperature?
Correct answer: C. Decreases
- A. Remains same
- B. Increases
- C. Decreases
- D. None
Explanation
Heating a liquid increases the kinetic energy of its molecules and weakens the relative effect of cohesive attractions, so the liquid flows more easily and its viscosity decreases. This is opposite to the usual behaviour of gases, whose viscosity tends to increase with temperature. Students may choose increases by applying the gas rule to liquids without distinguishing their molecular behaviour.
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About Properties of Liquids
Liquid behavior depends on intermolecular forces, which produce surface tension, viscosity, capillary action and a definite volume without a fixed shape. The topic also covers vapor pressure, evaporation, boiling point and the effect of temperature and external pressure, while distinguishing evaporation at the surface from boiling throughout the liquid.
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