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At a given temperature if P is the vapou...

At a given temperature if P is the vapour pressure of a solution and `P_0` that of its pure solvent , the relative lowerning of vapour pressure of the solution is given by :

A

`(P_0 - P) /( P_0`)

B

`(P - P_0)/ (P_0)`

C

`(P_0)/(P)

D

`(P)/ (P_0)`

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The correct Answer is:
A
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