Question

Match the LIST-I with LIST-II:

• A. A-III, B-I, C-II, D-IV
• B. A-I, B-III, C-II, D-IV
• C. A-II, B-III, C-IV, D-I
• D. A-III, B-II, C-IV, D-I

Hint:

"Throttling" through a valve is the classic example of an Isenthalpic process ($dH=0$). Chemical equilibrium is the definition of Minimum Gibbs Energy ($dG=0$).

Answer 1

The Correct Option is B

Concept: Thermodynamic state functions define the direction and equilibrium of various physical and chemical processes.

Step 1: Match A (Isothermal).
In an isothermal process (A) involving an ideal gas, temperature is constant, which directly implies that the internal energy change $dU=0$ (I).

Step 2: Match B (Adiabatic reversible).
As established in previous problems, an adiabatic reversible process (B) is isentropic, meaning the entropy change $dS=0$ (III).

Step 3: Match C (Chemical equilibrium).
For a system at chemical equilibrium (C) at constant T and P, the Gibbs free energy is at a minimum and its differential change is $dG=0$ (II).

Step 4: Match D (Joule-Thomson).
The Joule-Thomson expansion (D) (throttling) is a constant enthalpy process, meaning $dH=0$ (IV).