JEE Main 2019 (Online) 10th January Morning Slot | Solutions Question 114 | Chemistry

Liquids A and B form an ideal solution in the entire composition range. At 350 K, the vaapor pressures of pure A and pure B are 7 $$ \times $$ 10³ Pa and 12 $$ \times $$ 10³ Pa, respectively . The composition of the vapor in equilibriumwith a solution containing 40 mole percent of A at this temperature is :

x_A = 0.76; x_B = 0.24

x_A = 0.28; x_B = 0.72

x_A = 0.4; x_B = 0.6

x_A = 0.37; x_B = 0.63

JEE Main 2019 (Online) 9th January Evening Slot

MCQ (Single Correct Answer)

-1

A solution containing 62 g ethylene glycol in 250 g water is cooled to $$-$$ 10^oC. If K_f for water is 1.86 K kg mol^$$-$$1 , the amount of water (in g) separated as ice is :

JEE Main 2019 (Online) 9th January Morning Slot

MCQ (Single Correct Answer)

-1

Which one of the following statements regarding Henry's law is not correct ?

Higher the value of K_H at a given pressure, higher is the solubility of the gas in the liquids

Different gases have different K_H (Henry's law constant) values at the same temperature.

The partial pressure of the gas in vapour phase is proportional to the mole fraction of the gas in the solution.

The value of K_H increases with increase of temperature and K_H is function of the nature of the gas

JEE Main 2018 (Online) 16th April Morning Slot

MCQ (Single Correct Answer)

-1

The mass of a non-volatile, non-electrolyte solute (molar mass = 50 g mol^-1 ) needed to be dissolved in 114 g octane to reduce its vapour pressure to 75%, is :

37.5 g

75 g

150 g

50 g

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