The atmospheric pressure is the sum of the

In a mixture of $CO_2$ and $CH_4$ in a closed vessel at a constant temperature,the total pressure is $8.3 \times 10^4 \, Pa$. If the partial pressure of $CO_2$ is $2.8 \times 10^4 \, Pa$,what will be the partial pressure of $CH_4$?

The rate of diffusion of hydrogen is......

The water having more dissolved $O_{2}$ is:

Which of the following relationships is correct,where $r$ is the rate of diffusion of a gas and $d$ is its density?

Write four main properties of gases.