Define surface tension and provide its dimensions and $SI$ unit.

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 .......... $torr$.

Given below are two statements.
Statement $I$: Viscosity of liquid decreases with increase in temperature.
Statement $II$: The units of viscosity are $kg \ m^{-1} \ s^{-2}$.
The correct answer is

If $X \, mL$ of $H_2$ gas diffuses through a hole in a container in $5 \, s$,what is the time taken for the diffusion of the same volume of another gas under identical conditions?

The ratio of rates of diffusion of gases $X$ and $Y$ of molecular weights $36$ and $64$ is

Assertion: Standard boiling point of a liquid is slightly higher than the normal boiling point. Reason: $1 \ bar$ pressure is slightly less than $1 \ atm$ pressure.