Given is the graph between $\frac{PV}{T}$ and P for 1g of oxygen gas at two different temperatures $T_1$ and $T_2$, as shown in figure. Given, density of oxygen =1.427 kg $m^{-3}$. The value of PV/T at the point A and the relation between $T_1$ and $T_2$ are respectively $\frac{PV}{T} J{K}^{-1}$

$\begin{array}{l}\mathrm{PV}=\mathrm{nRT}=\frac{\mathrm{m}}{\mathrm{M}}\mathrm{RT}\text{ }\\ \text{where }\mathrm{m}=\text{ mass of the gas }\\ \text{and }\frac{\mathrm{m}}{\mathrm{M}}=\mathrm{n}=\text{ number of moles}\\ \Rightarrow \text{ }\frac{\mathrm{PV}}{\mathrm{T}}=\mathrm{nR}=\text{ a constant for all values of }\mathrm{P}\text{ }\\ \text{That is why ideally it is a straight line. }\\ \text{}\therefore \frac{\mathrm{PV}}{\mathrm{T}}=\frac{1 \text{g}}{32 \text{g} {\mathrm{mol}}^{-1}}\times 8.31 \text{J} {\mathrm{mol}}^{-1} {\text{K}}^{-1}=0.259 \text{J} {\text{K}}^{-1}\text{ }\\ {\text{Also, T}}_1>{\text{T}}_2\\ \mathrm{Horizontal}\mathrm{dotted}\mathrm{line}\mathrm{represents}\mathrm{ideal}\mathrm{gas}.\mathrm{Curve}1\mathrm{is}\mathrm{closer}\mathrm{to}\mathrm{dotted}\mathrm{line}.\\ \mathrm{A}\mathrm{real}\mathrm{gas}\mathrm{is}\mathrm{closer}\mathrm{to}\mathrm{ideal}\mathrm{gas}\mathrm{when}\mathrm{it}\mathrm{has}\mathrm{high}\mathrm{temperature}.\end{array}$