$1 \mathrm{mole}$ of gas occupies a volume of $100 \mathrm{mL}$ at $50 \mathrm{mm}$ pressure. What is the volume occupied by two moles of gas at $100 \mathrm{mm}$ pressure and at same temperature? 

At $0 °\mathrm{C}$ the density of a fixed mass of a gas divided by pressure is $x$. At $100 °\mathrm{C}$, the ratio will be 

A cylinder consists of hydrogen. Another cylinder of the same volume has helium of the same mass. If the pressure of hydrogen is $4 \mathrm{atm}$, then the pressure of helium is (assume constant temperature in both cases)

Two balloons are filled; one with pure $\mathrm{He}$ gas and the other with air, respectively. If the pressure and temperature of these balloons are the same, then the number of molecules per unit volume is

Three containers of the same volume contain three different gases. The masses of the molecules are $m_1$, $m_2$ and $m_3$ and the number of molecules in their respective containers are $N_1$, $N_2$ and $N_3$. The gas pressures in the containers are $P_1$, $P_2$ and $P_3$, respectively. All the gases are now mixed and put in one of the containers. The pressure $P$ of the mixture will be 

Which one of the following graphs is correct at constant pressure?

The kinetic theory of gases was put forward by

Gases exert pressure on the walls of the container because the gas molecules 

In kinetic theory of gases, a molecule of mass $m$ of an ideal gas collides with a wall of vessel with velocity $v$. The change in the linear momentum of the molecule is