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NEET 2016 Chemistry question

ChemistrySolutionsNEET 2016

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 . (Given vapour pressure data at , benzene = 12.8 kPa, toluene = 3.85 kPa)

Answer: (1)

Solution

For an ideal 1 : 1 mixture, . By Raoult's law the partial pressures are and , so . Mole fraction in vapour (Dalton's law): $ =

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Question ID VK-091914