The following graph represents variation of boiling point with composition of liquid and vapours of binary liquid mixture. The graph is plotted at constant pressure. Which of the following statement(s) is/are incorrect. Here X & Y stands for mole fraction in liquid and vapour phase respectively

Engineering

Chemistry

Raoult Law and Vapour Pressure

Ideal Solution

Question

The following graph represents variation of boiling point with composition of liquid and vapours of binary liquid mixture. The graph is plotted at constant pressure.
Which of the following statement(s) is/are incorrect. Here X & Y stands for mole fraction in liquid and vapour phase respectively

X_toluene = 0.3 and Y_benzene = 0.6

X_benzene = 0.3 and Y_toluene = 0.4

X_benzene = 0.7 and Y_toluene = 0.4

if X_benzene = 0.7 than Y_toluene < 0.3

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Benzene more volatile than toluene
Hence from figure
Statement (C) is correct X_toluene = 0.7 and Y_toluene = 0.4
⇒ X_benzene = 0.3 and Y_toluene = 0.4

Statement (D) is correct because X_benzene = 0.7 {Y_benzene > 0.7}
⇒ Y_toluene necessarily < 0.3

Statement (A) incorrect : absurb : because D option is correct
Statement (B) : X_toluene = 0.3 ⇒ X_benzene = 0.7
⇒ Y_benzene must be > 0.7

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