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Question: Answered & Verified by Expert

For three low density gases A, B, C pressure versus temperature graphs are plotted while keeping them at constant volume, as shown in the figure

The temperature corresponding to the point 'K' is:

PhysicsThermodynamicsJEE MainJEE Main 2023 (01 Feb Shift 2)
Options:
  • A -273°C
  • B -100°C
  • C 373°C
  • D -40°C
Solution:
1189 Upvotes Verified Answer
The correct answer is: -273°C

In case of constant volume process, i.e., isochoric process, 

From ideal gas equation,

PT=nRV=constant

Or we have, P=nRVt+273

If P=0t=-273°C

Thus, when temperature goes to -273°C, all constituent particles get freezed and pressure goes to zero irrespective of the density of gas.

Hence, the temperature corresponding to the point K=-273°C.

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