Chemistry Thermochemistry PMC 2021
PMDC Verified Question 51 of 81
Which one of the following is not an example of state function?
A
Volume(V)
B
Heat(q)
C
Temperature(T)
D
Enthalpy(H)
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Heat(q)
Concept:

Thermodynamic properties are divided into state functions (path-independent) and path functions (path-dependent).

Formula:

$$ \Delta E = q + w $$

Solution:

  • Temperature (T), Volume (V), and Enthalpy (H) are strictly determined by the current macroscopic state of a system. You can calculate their change purely by knowing the initial and final states. Thus, they are state functions.


  • Heat (q) represents the transfer of thermal energy. The amount of heat transferred depends entirely on how the process is executed (the path taken between states).


  • Therefore, Heat is a path function, not a state function.


Why other options are incorrect:

Volume, Temperature, and Enthalpy are all classic examples of state functions.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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