NEET 2016 Phase 1 · ChemistryPrevious Year Question
Which of the following statements about the composition of the vapour over an ideal 1 : 1 molar mixture of benzene and toluene is correct? Assume that the temperature is constant at 25 °C. (Given vapour pressure data at 25 °C, = 12.8 kPa, = 3.85 kPa)
Answer: (A) The vapour will contain a higher percentage of benzene.. \textbf{Answer:} (A) The vapour will contain a higher percentage of benzene.
- A.The vapour will contain a higher percentage of benzene.✓
- B.The vapour will contain a higher percentage of toluene.
- C.The vapour will contain equal amounts of benzene and toluene.
- D.Not enough information is given to make a prediction.
Correct Answer
(A) The vapour will contain a higher percentage of benzene.
Solution & Explanation
\textbf{Answer:} (A) The vapour will contain a higher percentage of benzene. \textbf{Solution:} For an ideal solution Raoult's law gives the partial pressures from the mole fractions in the liquid (). Partial pressures: kPa, kPa. Total pressure: kPa. Mole fraction of benzene in the vapour: . Since the vapour is always richer in the more volatile component (benzene), the vapour contains a higher percentage of benzene.
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