Chemistry Thermochemistry BUMHS 2023
PMDC Verified Question 31 of 81
Hess's law states the same thing as:
A
Henry's law
B
Second law of thermodynamics
C
First law of thermodynamics
D
Second law of thermochemistry
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: First law of thermodynamics
Concept:

Hess's Law of Constant Heat Summation establishes that the total enthalpy change of a reaction depends only on the initial and final states, not the path taken.

Solution:

  • Because Hess's Law essentially dictates that energy cannot be mysteriously created or destroyed by simply taking a different reaction pathway, it is a direct macroscopic application of the conservation of energy.


  • The conservation of energy is formally defined by the First law of thermodynamics.


Why other options are incorrect:

Henry's Law applies to gas solubility. The Second law of thermodynamics applies to entropy and spontaneity, not strictly enthalpy summation.

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.

Previous Question All Thermochemistry MCQs Next Question

Want to solve full-length papers under timed exam conditions?

Practice with zero-scroll lockdown sprints, dynamic latency zone timers, live peer selection telemetry, and the automated Amber mistake recovery loop.

Enter Arena Sprint iOS App Android App