NEET 2024 · PhysicsIdeal gasPrevious Year Question
The following graph represents the T–V curves of an ideal gas (where T is the temperature and V the volume) at three pressures P₁, P₂ and P₃, compared with those of Charles's law represented as dotted lines. Then the correct relation is:
Answer: (C) P₁ > P₂ > P₃. Correct Answer (C): P₁ > P₂ > P₃ Rearranging the ideal gas law PV = nRT gives T = (P/nR) V.
- A.P₁ > P₃ > P₂
- B.P₂ > P₁ > P₃
- C.P₁ > P₂ > P₃✓
- D.P₃ > P₂ > P₁
Correct Answer
(C) P₁ > P₂ > P₃
Solution & Explanation
Correct Answer (C): P₁ > P₂ > P₃ Rearranging the ideal gas law PV = nRT gives T = (P/nR) V. On a T-versus-V graph this is a straight line through the origin whose slope, P/nR, is proportional to the pressure. Therefore the steepest line corresponds to the highest pressure. Reading the graph, the line for P₁ is steepest and P₃ least steep, so P₁ > P₂ > P₃.
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