Assertion :The pressure of wet gas is reduced to half, if its volume is doubled. Reason: Aqueous tension remains constant at constant pressure.

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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Assertion is incorrect but Reason is correct

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Solution

The correct option is C Assertion is correct but Reason is incorrect
The pressure of the moist gas is equal to the sum of the pressure of dry gas and the pressure of the water vapours. The observed pressure of the moist gas is equal to the sum of the pressure of the dry gas and the pressure of water vapours. The pressure of the water vapours is constant at a particular temperature and is known as aqueous tension at that temperature.

$P_{observed} = P_{gas} + aqueous tension$

$P_{gas} = P_{observed} - aqueous tension$

As saturated vapours do not obey gas laws so aqueous tension doesn't remains constant at constant pressure.

Hence, the correct option is $C$

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