Explain the effect of increasing the temperature of a liquid on the intermolecular forces operating between its particles. What will happen to the viscosity of a liquid if its temperature is increased?

The ratio of rates of diffusion of helium $(He)$ to hydrogen $(H_2)$.

Which of the following statements is incorrect?

When $CH_4$ gas is collected over water,the total pressure is $735 \ torr$ and the temperature is $292 \ ^\circ C$. If the vapor pressure of water at $292 \ ^\circ C$ is $30 \ torr$,then the pressure exerted by the dry methane gas will be .......... $torr$.

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:

What is the density of water vapour at the boiling point of water?