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Grade 12th passPhysical Chemistry

1--Oxygen gas is collected by downward displacement of water in a jar. The level of water inside the jar is adjusted
to the height of water outside the jar. When the adjustment is made the pressure exerted by the oxygen is
(a) equal to the atmospheric pressure
(b) equal to the vapour pressure of oxygen at that temperature.
(c) equal to atmospheric pressure plus aqueous tension at that temperature.
(d) equal to atmospheric pressure minus aqueous tension at that temperature

Profile image of vikas kumar
11 Years agoGrade 12th pass
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1 Answer

Profile image of Sunil Kumar FP
11 Years ago
ANS:-(D)
When the gas is colleced over the water, it becomes moist due to presence of small quantity of water vapour caused by evaporation.
Then, pressure exerted by moist gas = pressure exerted by dry gas + pressure of water vapour (aqueous tension).
i.e. Patmospheric = Pdry + f (aqueous tension)
or, Pdry = Patmospheric – f
Therefore, aqueous tension should be subtracted from the total pressure to get pressure of the dry gas.

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