Directions : In the following questions, a statement of assertion i...

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Directions : In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as :
(a) If both assertion and reason are true and reason is the correct explanation of assertion.
(b) If both assertion and reason are true but reason is not the correct explanation of assertion.
(c) If assertion is true but reason is false.
(d) If both assertion and reason are false.
Assertion : A quâsi-static isothermal expansion of an ideal gas in a cylinder fitted with a frictionless movable piston is a irreversible process.
Reason : A process is irreversible only if system remains in equilibrium with the surroundings at every stage.
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