Which gas volume is measured in a sample by using a solution of $CuCl$ in $NH_4OH$ through the measurement of volume change?

What is the boiling point of $SO_2$ gas (in $K$)?

Write four main properties of gases.

What is the absolute or Kelvin temperature scale?

$A$ 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:

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