Problem 6 - Entrance Test

Let's analyze each statement: A) Viscosity of a liquid decreases with an increase in temperature: Correct. Increased kinetic energy allows molecules to overcome intermolecular forces more easily, leading to less resistance to flow. B) Viscosity is primarily caused by intermolecular forces in liquids: Correct. Stronger attractive forces between molecules impede their movement relative to each other. C) Viscosity of gases decreases with an increase in temperature: Incorrect. Viscosity of gases increases with an increase in temperature. In gases, viscosity is due to momentum transfer between layers of gas moving at different speeds. At higher temperatures, molecules move faster and collide more frequently, leading to greater momentum transfer and thus increased viscosity. D) Stronger intermolecular forces generally lead to higher viscosity in liquids: Correct. More attractive forces mean more resistance to flow.