Solutions

If O₂ gas is bubbled  through water at 303 K, the number of millimoles of O₂ gas that dissolve in 1 litre of water is______________. (Nearest integer)

(Given: Henry’s Law constant for O₂ at 303 K is 46.82 k bar and partial pressure of O₂ = 0.920 bar)

(Assume solubility of O₂ in water in too small, nearly negligible)

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 osmotic pressure of blood is 7.47 bar at 300K. To inject glucose to a patient intravenously, it has to isotonic with blood. The concentration of glucose solution in gL^-1 is __________.

(Molar mass of glucose = 180 g mol^-1 R = 0.083 L bar K^-1 mol^-1) Nearest integer)

The equation

k =   $\left(6.5*10^{12}{s}^{-1}\right)e^{-26000K/T}$

Is followed for the decomposition of compound A. The activation energy for the reaction is________ kJ mol^-1 [nearest integer]        (Given : R = 8.314 JK^-1 mol^-1)

2.0g of H₂ gas is adsorbed on 2.5g platinum powder at 300K and 1 bar pressure. The volume of the gas adsorbed per gram of the adsorbent is ______________mL.

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

The osmotic pressure exerted by a solution prepared by dissolving 2.0g of protein of molar mass 60 kg mol^-1 in 200 mL of water at 27°C is_______Pa. (nearest integer)

(Use R = 0.083 L bar mol^-1 K^-1)

1.2 mL of acetic acid is dissolved in water to make 2.0L of solution. The depression in freezing point observed for this strength of acid is 0.0198°C. The percentage of dissociation of the acid is_____________. (Nearest Integer).

[Given Density of acetic acid is 1.02g mL^-1

Molar mass of acetic acid is 60g mol^-1]

The elevation in boiling point for 1 molal solution of non-volatile solute A is 3K. The depression in freezing point for 2 molal solution of A in the same solvent is 6 K. The ratio of K_b and K_f i.e. K_b/K_f is 1 : X. The value of X is [nearest integer]

Match List – I and List – II.

Choose the correct answer from the options given below

A gaseous mixture of two substances A and B, under a total pressure of 0.8 atm is in equilibrium with an ideal solution. The mole fraction of substance A is 0.5 in the vapour phase and 0.2 in the liquid phase. The vapour pressure of pure liquid A is_________atm. (Nearest integer)