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If P^(@) and P(S) are the vapour pressur...

If `P^(@)` and `P_(S)` are the vapour pressure of the solvent and solution respectively, `n_(1) and n_(2)` are the mole fractions of the solvent and solute respectively, then:

A

`P_(S)=P^(@)n_(1)`

B

`P_(S)-P^(@)n_(2)`

C

`P^(@)=P_(S)n_(2)`

D

`P_(S)=P^(@)(n_(1)//n_(2))`

Text Solution

Verified by Experts

The correct Answer is:
A
According to Raoult's law,
`(P^(@)-P_(S))/(P^(@))=(n)/(n+N)`
or `(P^(@)-P_(S))/(P^(@))=n_(2)` (as given)or `1-(P_(S))/(P^(@))=n_(2)`
or `(P_(S))/(P^(@))=1-n_(2)=n_(1) or P_(S)=P^(@)xxn_(1)`
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