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Q.

One mole of an ideal gas goes from an initial state A to final state B via two processes. It first undergoes isothermal expansion from volume V to 3 V and then its volume is reduced from 3V to V at constant pressure. The correct P-V diagram representing the two processes is :

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a

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b

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c

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d

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answer is B.

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Detailed Solution

In isothermal expansion T = constant ⇒ PV = constant ⇒ graph is rectangular hyperbola.
At constant pressure P = constant

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