Equal volume of $2$ gases $A$ and $B$ diffuse in $20 \ s$ and $10 \ s$ respectively. If molar mass of $A$ is $80$,then the molar mass of $B$ is:

What is saturated vapor pressure?

$50 \ mL$ of hydrogen diffuses out through a small hole from a vessel in $20 \ min$. The time needed for $40 \ mL$ of oxygen to diffuse out is ............. $min$.

Equal amounts of two gases of molecular weights $4$ and $40$ are mixed. The pressure of the mixture is $1.1 \ atm$. What will be the partial pressure of the lighter gas in the mixture (in $atm$)?

Sulphur dioxide $(SO_2)$ and oxygen $(O_2)$ were allowed to diffuse through a porous partition. $20 \ dm^3$ of $SO_2$ diffuses through the porous partition in $60 \ seconds$. The volume of $O_2$ in $dm^3$ which diffuses under the similar conditions in $30 \ seconds$ will be (atomic mass of sulphur $= 32 \ u$)

Arrange the states of matter (solid,liquid,and gas) in increasing order of their energy.