Question

Which of the following statement is true for viscosity of liquids?
A)Viscosity increases with the
increase in temperature
B)Viscosity increases with the decrease in
temperature
C)Viscosity decreases with the
increase in temperature
D)Viscosity decreases with the
decrease in temperature

Answer 1

Answer:

Which of the following statement is true for viscosity of liquids?

A)Viscosity increases with the

increase in temperature

B)Viscosity increases with the decrease in

temperature

C)Viscosity decreases with the

increase in temperature

D)Viscosity decreases with the

decrease in temperature✔

Answer 2

Viscosity decreases with the increase in temperature.

(Option C)

• Cohesion between molecules is the primary source of viscosity in liquids.
• With increasing temperature, this cohesive force reduces as particle energy increases, making particle mobility easier. As a result, as the temperature rises, the viscosity of water reduces.
• Randomness/molecular collision caused by the root mean square velocity is a major source of viscosity in gases.
• The kinetic energy of molecules increases as temperature rises, increasing RMS speed and hence unpredictability and collision of molecules. This makes flow harder, and as a result, viscosity in gases increases with temperature.
• Thus, option C is the correct answer.