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Chemistry · PYQ NEET UG 2016(1)

हिन्दी

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 \( 25^\circ\text{C} \). (Given: Vapour pressure data at \( 25^\circ\text{C} \), benzene = \( 12.8\text{ kPa} \), toluene = \( 3.85\text{ kPa} \))

  1. The vapour will contain equal amounts of benzene and toluene.
  2. Not enough information is given to make a prediction.
  3. The vapour will contain a higher percentage of benzene.
  4. The vapour will contain a higher percentage of toluene.

Correct answer · Option 3

The vapour will contain a higher percentage of benzene.

Explanation

According to Raoult's law, the component with higher vapour pressure (benzene, \( 12.8\text{ kPa} \)) will have a greater mole fraction in the vapour phase than in the liquid phase.
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