Chemistry Gases PMC 2021
PMDC Verified Question 50 of 65
When temperature increases, isotherm moves?
A
Away from both axis
B
Toward x axis
C
Toward y axis
D
Remains at same position
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Away from both axis
Concept:

An isotherm is a curve on a Pressure-Volume (P-V) graph representing Boyle's Law at a constant temperature. According to Charles's Law, volume is directly proportional to temperature.

Solution:

  • On a P-V graph, if the constant temperature of an experiment is set to a higher value \( (T_2 > T_1) \), the overall kinetic energy of the gas increases.


  • To maintain the same pressure at a higher temperature, the gas must occupy a larger volume (\( V \propto T \)).


  • Therefore, the entire hyperbolic curve (isotherm) shifts outward, moving further away from both the x-axis and y-axis into regions of higher pressure-volume products.


Why other options are incorrect:

  • Options B & C: Moving toward an axis implies a decrease in Volume or Pressure, which corresponds to a decrease in temperature, not an increase.
  • Option D: The isotherm represents a specific constant temperature; if the temperature changes, the curve must physically shift.

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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