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Assertion: P-V graph (at constant temperature) for ideal gas is rectangular parabola Reason: Ideal gas obeys Charle's law

1. Both assertion (A) and reason (R) are correct and R gives the correct explanation
2. Both assertion (A) and reason (R) are correct but R doesnt give the correct explanation
3. A is true but R is false
4. A is false but R is true

Correct answer: Both assertion (A) and reason (R) are correct but R doesnt give the correct explanation

Solution

For an ideal gas at constant temperature, PV = constant, so the P–V plot is a rectangular hyperbola, not a rectangular parabola. Charles’ law relates V and T at constant pressure, so it is true for ideal gases but does not explain the isothermal P–V curve.

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