A capillary tube (A) is dipped in water. Another identical tube (B) is dipped in a soap-water solution. Which of the following shows the relative nature of the liquid columns in the two tubes?

Options

A.
B.
C.
D.

Answer

C

Explanation

Capillary height is proportional to surface tension or `Tproph`.
Soap reduces the surface tension of water.
The height of liquid supported decreases.
But it is also a wetting agent. Therefore, the meniscus will not be convex as in mercury. Therefore (C)