The ratio of the rate of diffusion of $SO_2$ to $CH_4$ is

If three unreactive gases having partial pressures $P_A$,$P_B$,and $P_C$ and their moles are $1$,$2$,and $3$ respectively,then their total pressure will be:

The $O_2$ gas is collected over water at $400 \ K$ temperature in a $2 \ L$ vessel. If the total pressure of the mixture is $33.26 \ bar$ and the pressure of dry $O_2$ gas is $32.20 \ bar$,find the vapour pressure of water under the same conditions.

On a certain day,the humidity in the atmosphere is $1\%$. If the barometer reads $760 \ mm \ of \ Hg$,what will be the pressure of the dry gas in $mm \ of \ Hg$?

The ratio of the rate of diffusion of a given element to that of helium is $1.4$. The molecular weight of the element is

Fill in the blanks:
$(1)$ The forces of attraction and repulsion between molecules and atoms are called ....... .
$(2)$ The attractive intermolecular forces between molecules of a substance are also known as .............. .
$(3)$ London forces are also known by the name of ........... .
$(4)$ The mathematical form of Charles's Law is ........ .