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Lowering of vapour pressure is determine...

Lowering of vapour pressure is determined by Ostward and Walner dynamic method. It is based on the principle, when air is allowed to pass through a solvent or solution, it takes up solvent vapour with it to get itself saturated with vapours at that temperature.
dry ari `to` solution `overset(P_(A)) to underset(A)("solvent") overset(P_(A)^(+)) to "Anhy".CaCl_(2) to` air.
A and B are weighted separately before and after passing dry air. Loss in weight of each set, gives the lowering of vapour pressure. The temperature of air, the solution and the solvent is kept constant.
Loss in weight `(w_(1))` of solution will be proportional to

A

`P_(A)`

B

`P_(A)^(@)`

C

`P_(B)`

D

`P_(B)^(@)`

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The correct Answer is:
A
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