JEE Advanced · 2025 · 18 May 2025 · Paper 1 · Chemical Thermodynamics

An ideal gas (0.5 mol), initially at 2 bar pressure, is compressed at a constant temperature of 600 K in two steps : first against a constant external pressure of P bar $(2<\mathrm{P}<8)$, and then against constant external pressure of 8 bar. At each step, the compression is st …

List-I contains various physical/chemical processes, and List-II contains combinations of changes in enthalpy $(\Delta \mathrm{H})$ and entropy $(\Delta \mathrm{S})$. Match each entry in List-I to appropriate entry in List-II, and choose the correct option.

| List-I | | List …

Consider the following volume-temperature (V - T) diagram for the expansion of 5 moles of an ideal monoatomic gas.

(see diagram)

Considering only P-V work is involved, the total change in enthalpy (in Joule) for the transformation of state in the sequence …

The entropy versus temperature plot for phases $\alpha$ and $\beta$ at 1 bar pressure is given.
${\mathrm{S}}_{\mathrm{T}}$ and ${\mathrm{S}}_0$ are entropies of the phases at temperatures T and 0 K, respectively.

(see diagram)

The transition temperature for $\alpha$ to …

The entropy versus temperature plot for phases $\alpha$ and $\beta$ at 1 bar pressure is given.
${\mathrm{S}}_{\mathrm{T}}$ and ${\mathrm{S}}_0$ are entropies of the phases at temperatures T and 0 K, respectively.

(see diagram)

The transition temperature for $\alpha$ to …

One mole of an ideal monoatomic gas undergoes two reversible processes (A → B and B → C) as shown in the given figure:

(see figure)

$\mathrm{A}\to \mathrm{B}$ is an adiabatic process. If the total heat absorbed in the entire process ( …