Physics Question from JEE Main 2023 · 1 February, Shift 2

For three low density gases A, B, C pressure versus temperature graphs are plotted while keeping them at constant volume.

Pressure $P$ (in atm) is on the vertical axis and temperature (in $^\circ \text{C}$) is on the horizontal axis, the vertical axis being drawn at the $0^\circ \text{C}$ mark. The three plots are straight lines of different slopes — A the steepest, then B, then C the least steep — and all three lines start from one and the same point K on the temperature axis, which lies to the left of $0^\circ \text{C}$, so the pressure of every gas is zero at K.

The temperature corresponding to the point 'K' is: