The figure shows the pressure versus density graph for an ideal gas at two temperatures $T_1$ and $T_2$.

The relation between $T_1$ and $T_2$ is,

From the $p-T$ graph, what conclusion can be drawn?

$pV$ versus $T$ graph of equal masses of ${\mathrm{H}}_2, \mathrm{He}$ and ${\mathrm{O}}_2$ is shown in the figure. Choose the correct alternative

Pressure versus temperature graph of an ideal gas constant volume $V$ is shown by the straight line $A$. Now, mass of the gas is doubled and volume is halved, then the corresponding pressure versus temperature graph will be shown by the line