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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, X L and X M represent mole fractions of L and M , respectively, in the solution. The correct statement(s) applicable to this system is(are) -

Options

  1. AThe point Z represents vapour pressure of pure liquid M and Raoult's law is obeyed when X L → 0
  2. BThe point Z represents vapour pressure of pure liquid L and Raoult's law is obeyed when X L → 1
  3. CAttractive inter-molecular interactions between L – L in pure liquid L and M-M in pure liquid M are stronger t
  4. DThe point Z represents vapour pressure of pure liquid M and Raoult's law is obeyed from X L = 0 to X L = 1

Correct answer

B. The point Z represents vapour pressure of pure liquid L and Raoult's law is obeyed when X L → 1

Step-by-step solution

(iii) This is case of positive deviation hence F L - L , F M - M > F L - M

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