Solutions

The vapour pressure of two volatile liquid A and B at 25°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 $\frac{x}{17}.$  The value of x is____________.

Elevation in boiling point for 1.5 molal solution of glucose in water is 4 K. The depression in freezing point for 4.5 molal solution of glucose in water is 4K. The ratio of molal elevation constant to molal depression constant (K_b/K_f) is________.

150g of acetic acid was contaminated with 10.2g ascorbic acid $\left(C_6{H}_8{O}_6\right)$  to lower down its freezing point by (x * 10^-1)°C. The value of x is _________. (Nearest integer)

          (Given K_f = 3.9 K kg mol^-1; molar mass of ascorbic acid = 176 g mol^-1]

The depression in freezing point observed for a formic acid solution of concentration 0.5 mL L^-1 is $0.0405°C.$  Density of formic acid is 1.05 g mL^-1. The Van't Hoff factor of the formic acid solution is nearly: (Given for water $K_f=1.86kkgmo{l}^{-1}$ )

What is the apparent molecular mass (in gm/mol) of a weak acid, HA (molar mass = 30.0 gm/mol) in an aqueous solution, which shows elevation in boiling point by $0.0156°C?$  

[Given: pK_a (HA) = 2.0, K_b (H₂O) = 0.52 K kg mol^-1]

Determine the freezing point (nearest integer) of a 1 mole kg^-1 aqueous solution of a weak electrolyte that is 7.5% dissociated into two ions (in °C) [Given K f of water is 1.86 °C/m].

Calculate the strength in g/L of 10 volume solution of hydrogen peroxide at 273 K and 1 bar pressure. [Report your answer divided by 10]

Consider a solution consisting of the following two buffer systems.

Which of the following statement is true for an ideal solution?

The density of a solution prepared by dissolving 1 gram molecule of sucrose in 1000 gram of water is 1.15 gm/ml. The molarity of the solution is ____.