Question

How does the surface tension of water compare with the surface tensions of most other liquids?

a.)It is lower.
b.)It is about the same.
c.)It is higher.
d.)It is higher when a surfactant is added.

i think its C or D.

Answer 1

d is not true. Adding a surfactant lowers the surface tension; in fact, surfactants are added just for that reason.
c is correct.
You can float a needle on top of the water in a cup because of surface tension. I've done it.