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Under which condition is vapour pressure measured correctly?

Answer and explanation

Correct answer: In a closed vessel at equilibrium

The vapour pressure of a liquid is the pressure exerted by its vapour when the liquid and vapour are in dynamic equilibrium at a specified temperature. A closed vessel is needed so that vapour does not continuously escape. In an open vessel or strong wind, vapour is removed and equilibrium pressure is not established. A vacuum without liquid cannot have the vapour pressure of that liquid. Hence A is correct.

Related tags

Vapour PressureClosed VesselDynamic EquilibriumEquilibrium In Physical And Chemical ProcessesEquilibriumChemistryClass 11 Mcq

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