Chemistry - Thermodynamics - I Question with Solution | TestHub

Question Explanation: Match thermodynamic parameters for phase transition of water at boiling point.

Concept: Reversible Phase Transition.

Solution:

Boiling water at 100°C and 1atm is a reversible process.

P (ΔU): Energy change is positive (3).

Q (ΔS_total ): Reversible process, so sum is 0 (1).

R (Work): Expansion work (PΔV) is negative (4).

S (Heat): Heat absorbed is enthalpy of vaporization (2).

Final Answer: Option (B)