For a solution formed by mixing liquids L and M , the vapour pressure of L plotted against the mole fraction…

For a solution formed by mixing liquids L and M, the vapour pressure of L plotted against the mole fraction of M in solution is shown in the following figure, Here, XL and XM represent mole fractions of L and M, respectively, in the solution. The correct statement(s) applicable to this system is(are) -

  1. The point Z represents vapour pressure of pure liquid M and Raoult's law is obeyed when XL →0
  2. The point Z represents vapour pressure of pure liquid L and Raoult's law is obeyed when XL →1
  3. Attractive inter-molecular interactions between L–L in pure liquid L and M-M in pure liquid M are stronger than those between L–M when mixed in solution
  4. The point Z represents vapour pressure of pure liquid M and Raoult's law is obeyed from XL=0 to XL=1

Solution

(iii)  This is case of positive deviation hence

FL-L, FM-M>FL-M

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Asked in: JEE Advanced 2017 (Paper 1)

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