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

$A$ certain volume of oxygen gas diffuses through a porous pot in $20 \ s$. If the same volume of another gas $(X)$ diffuses in $Y \ s$, then $(X)$ and $Y$ respectively are:

Which of the following statements is correct?

$A$ gas diffuses $1/3$ times as fast as hydrogen. Its molecular weight is

Provide the $SI$ units for the following gas properties:
$(i)$ Mass $(ii)$ Volume $(iii)$ Temperature $(iv)$ Pressure

$A$ container consists of a mixture of four gases: $5 \text{ g } H_2$,$8 \text{ g } He$,$50 \text{ g } CO_2$,and $20 \text{ g } Ne$ at a certain temperature. Which of the following gases exerts the minimum partial pressure?