Question

With the increase of tempemture

• A. surface tension of liquid increases
• B. viscosity of gases decreases
• C. viscosity of liquids increase
• D. both the surface tension and viscosity of liquids increase
• E. both the surface tension and viscosity of liquid decrease

Answer 1

The Correct Option is B

When the temperature of a substance increases, it has different effects on its surface tension and viscosity, depending on the type of substance (liquid or gas). 

• Surface tension of liquids typically decreases with an increase in temperature. As the temperature rises, the molecules in the liquid gain more kinetic energy, causing them to move more freely, which reduces the attractive forces between them and lowers the surface tension.
• Viscosity of liquids generally decreases with temperature for most liquids. As the temperature rises, the intermolecular forces in liquids weaken, and the increased molecular movement makes it easier for layers to slide past each other, thus lowering viscosity.
• Viscosity of gases increases with an increase in temperature. For gases, when the temperature increases, the molecules move faster and collide more often, which increases the internal friction, leading to higher viscosity.

Therefore, the correct statement is that with an increase in temperature, the viscosity of gases increases.

Correct Answer:

Correct Answer: (B) viscosity of gases increases