NEET 2026 Chemistry, question 69.

Consider the reversible processes for 1.0 mol of an ideal gas as shown in the figure.

[Figure: Processes 2 and 4 are adiabatic]

$w_1$, $w_2$, $w_3$ and $w_4$ represent work done (in calories) in the processes 1, 2, 3 and 4, respectively; $\Delta U_2$ and $\Delta U_4$ are changes in the internal energy for the processes 2 and 4, respectively.

[use R = 2 cal K$^{-1}$ mol$^{-1}$]

The correct option is