Question

On heating a liquid , it's viscosity ________

• A. decreases
• B. increases
• C. first increases and then decreases
• D. first decreases and then increases

Answer 1

The correct option is A

decreases

Viscosity:

• Viscosity is the internal resistance that comes into play when fluid is in motion.
• When a liquid is heated, the kinetic energy of its molecules increases and the intermolecular attraction becomes weaker.
• It helps to increase the movement of molecules and thus the liquid becomes more fluid.
• Hence, the viscosity of a liquid decreases with the increase in its temperature.

Therefore, on heating a liquid, it's viscosity decreases