$A s s e r t i o n :$ A quasi-static isothermal expansion of an ideal gas in a cylinder fitted with a frictionless movable piston is a irreversible process
$R e a s o n :$ A process is irreversible only if system remains in equilibrium with the surroundings at every stage.

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if both assertion and reason are true but reason is not the correct explanation of assertion

If both assertion and reason are true and reason is the correct explanation of assertion.

if both assertion and reason are false

if assertion is true but reason is false.

answer is D.

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Detailed Solution

Irreversible process (like a free expansion or an explosive chemical reaction) take the system to non-equilibrium states.

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