Question

Liquid A is known to have a lower surface tension and lower viscosity than Liquid B. Use these facts to predict the result of below experiment , if you can.
Experiment:
25.0 mL each of Liquid A and Liquid B are poured through a funnel, and the times tA and tB needed to pour each liquid through the funnel are measured.
Predicted outcome :
O tA will be greater than tB
O tA will be less than tB
O tA will be equal to tB
O Its impossible to predict whether tA or tB will be greater without more information.

Answer 1

Answer: Option (B) is the correct answer.

Explanation:

Surface tension is defined as the attractive forces experienced by the surface molecules of a liquid by the molecules present beneath the surface layer of the liquid.

And, viscosity is defined as the ability of a liquid to resist its flow. When a substance has high viscosity then it is known as a viscous substance.

Since, it is given that viscosity of liquid B is more than liquid A. Therefore, liquid B has more resistive force on its surface as compared to liquid A. As a result, time taken by liquid B is more than time taken by liquid A.

Also,    Surface tension = $\frac{Force}{Length}$

Surface tension of liquid B is more than liquid A. Therefore, $F_{B} > F_{A}$.

Thus, we can conclude that tA will be less than tB.