Which shape does a liquid have in its lowest energy state?

Which of the following relationships is correct,where $r$ is the rate of diffusion of a gas and $d$ is its density?

What is viscosity?

Which one is not a correct mathematical equation for Dalton's Law of partial pressure? Here $p =$ total pressure of the gaseous mixture.

If two molecules of $A$ and $B$ have molar masses of $100 \ g/mol$ and $64 \ g/mol$ respectively,and the rate of diffusion of $A$ is $12 \times 10^{-3} \ mol/s$,then the rate of diffusion of $B$ will be:

Provide a detailed explanation of surface tension and viscosity.