The density of phosgene $(COCl_2)$ gas at $STP$ is........

$A$ mixture of one mole each of $H_2$,$He$ and $O_2$ are enclosed in a cylinder of volume $V$ at temperature $T$. If the partial pressure of $H_2$ is $2 \ atm$,the total pressure of the gases in the cylinder is $....... \ atm$

What is viscosity?

At $T \ K$,hydrogen and oxygen gases are mixed in the ratio of $1:2$ by mass in a closed vessel of volume '$V$' litres. If the total pressure of the gaseous mixture is '$p$' atm,the partial pressure of oxygen (in atm) is

Where will the boiling point be lower: at the seashore or on a mountain? Why?

It is recommended that a liquid ammonia bottle should be opened after cooling it in ice for some time. This is because liquid ammonia: