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JEE Main 2022 (Online) 29th June Morning Shift
Numerical
+4
-1
English
Hindi

1.2 mL of acetic acid is dissolved in water to make 2.0 L of solution. The depression in freezing point observed for this strength of acid is 0.0198$$^\circ$$C. The percentage of dissociation of the acid is ___________. (Nearest integer)

[Given : Density of acetic acid is 1.02 g mL$$-$$1, Molar mass of acetic acid is 60 g mol$$-$$1, Kf(H2O) = 1.85 K kg mol$$-$$1]

2
JEE Main 2022 (Online) 28th June Evening Shift
Numerical
+4
-1
English
Hindi

2.5 g of protein containing only glycine (C2H5NO2) is dissolved in water to make 500 mL of solution. The osmotic pressure of this solution at 300 K is found to be 5.03 $$\times$$ 10$$-$$3 bar. The total number of glycine units present in the protein is ____________.

(Given : R = 0.083 L bar K$$-$$1 mol$$-$$1)

3
JEE Main 2022 (Online) 28th June Morning Shift
Numerical
+4
-1
English
Hindi

The vapour pressures of two volatile liquids A and B at 25$$^\circ$$C are 50 Torr and 100 Torr, respectively. If the liquid mixture contains 0.3 mole fraction of A, then the mole fraction of liquid B in the vapour phase is $${x \over {17}}$$. The value of x is ______________.

A solution containing 2.5 $$\times$$ 10$$-$$3 kg of a solute dissolved in 75 $$\times$$ 10$$-$$3 kg of water boils at 373.535 K. The molar mass of the solute is ____________ g mol$$-$$1. [nearest integer] (Given : Kb(H2O) = 0.52 K kg mol$$-$$1 and boiling point of water = 373.15 K)