Assertion :When a gas at high pressure expands against vaccum, the work done is maximum. Reason: Work done in expansion depends upon the pressure inside the gas and increase in volume.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is D Both Assertion and Reason are incorrect
As we know, $W = P Δ V$ .
So, when a gas at high pressure expands against vacuum, the work done is zero as external pressure is zero.

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