1.

If p^(@) and p_(s) are the vapour pressures of the solvent and its solution respectively and N_(1) and N_(2) are the mole fractions of the solvent and solute respectively, then

Answer»

<P>`P_(S)=p^(@)N_(2)`
`P^(@)-P_(S)=p^(@)N_(2)`
`P_(S)=P^(@)N_(1)`
`(P^(@)-P_(S))//P_(S)=N_(1)//(N_(1)+N_(2))`.

ANSWER :B::C


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