Liquid Solution Questions

0.2 molal acid HX is 20% ionised in solution Kf = 1.86 K molality–1. The freezing point of the solution is

Assertion : Reverse osmosis is used to purify sea water. Reason : Solvent molecules pass from concentrate solution to pure solvent through semipermeable membrane if high pressure (> π) is applied on solution side

A solution containing 12.5g of non-electrolyte substance in 175g of water gave boiling point elevation of 0.70K. Calculate the molar mass of the substance. Molal elevation constant (Kb) for water 0.52K kg mol−1

Which among the following solutions will exhibit positive deviation from Raoult's law?

Match List-I with List-II The correct option is

Y gm of non-volatile solute of molar mass M is dissolved in 250 g of benzene. If Kb is molal elevation constant, the value of ΔT is given by-

The relationship between osmotic pressure at 273 K when 10 g glucose (p1), 10 g urea (p2) and 10 g sucrose (p3) are dissolved in 250 mL of water is:

What is the freezing point of a solution containing 8.1 g HBr in 100 g water assuming the acid to be 90% ionised? (kf for wt. = 1.86 K mol–1)

Which characterises the weak intermolecular forces of attraction in a liquid?

Y g of non-volatile organic substance of molecular mass M is dissolved in 250 g benzene. Molal elevation constant of benzene of Kb. Elevation in its boiling point is given by:

Freezing point of an aqueous solution is –0.186°C. Elevation of boiling point of same solution would be: (Kb = 0.512 and Kf = 1.86 K molality–1)

During osmosis, flow of water through a semipermeable membrane is:

In a mixture of A and B, components show negative deviation when

Saturated solution of NaCl on heating becomes:

Solutions A, B, C and D are respectively 0.1M glucose, 0.05 M NaCl, 0.05 M BaCl2 and 0.1 M AlCl3. Which one of the following pairs is isotonic?

The vapour pressure of two pure liquid (A) and (B) are 100 torr and 80 torr respectively. The total pressure of solution obtained by mixing 2 mole of (A) and 3 mole of (B) would be:

The degree of dissociation (α) of a weak electrolyte, AxBy is related to van’t Hoff factor (i) by the expression

The freezing point of solvent is depressed by 0.37°C in a 0.01 mol NaCl solution. The freezing point of 0.02 molal solution of urea is depressed by:

The statement, “The mass of a gas dissolved in a given mass of a solvent at any temperature is proportional to the pressure of the gas above the solvent” is

An azeotropic solution of two liquids has boiling point lower than either when it

The unit of molality is:

The relative lowering of vapour pressure of an aqueous solution containing non-volatile solute is 0.0125. The molality of the solution is:

The vapour pressure of pure liquid A is 0.80 atm. When a non-volatile B is added to A its vapour pressure drops to 0.60 atm. The mole fraction of B in the solution is:

A solution of urea (mol. mass 56) boils at 100.18°C at atmospheric pressure. If Kf and Kb for water are 1.86 and 0.512 K molality–1 respectively, the above solution will freeze at:

Which of the following statement is true?

The vapour pressure of benzene at 80°C is lowered by 10 mm by dissolving 2g of a non-volatile substance in 78 g of benzene. The vapour pressure of pure benzene at 80°C is 750 mm. The molecular weight of the substance will be:

Which of the following mixture does not show positive deviation from the Raoult's law?

The normality of 2.3 MH2SO4 solution is:

A solution containing 1.8 g of a compound (empirical formula CH2O) in 40 g of water is observed to freeze at –0.465°C. The molecular formula of the compound is (Kf of water – =1.86 kg K mol–1)

The osmotic pressure of 0.2molar solution of urea at 27°C (R = 0.082 L atm mol–1 K–1) is

The solubility order for the following gases is:

A solution of sucrose (molar mass 342 g mol–1) has been produced by dissolving 68.5 g sucrose in 1000 g water. The freezing point of the solution obtained will be: (Kf for H2O = 1.86 K kg mol–1)

Dissolution of a solute is an exothermic process if:

Mole fraction of solute in benzene is 0.2 then find molality of solute

The osmatic pressure of a 5% (wt./vol) solution of cane sugar at 150°C is:

A and B ideal gases. The molecular weights of A and B are in the ratio of 1:4. The pressure of a gas mixture containing equal weight of A and B is p atm. What is the partial pressure (in atm) of B in the mixture?

Molal elevation constant of a liquid is:

At high altitude the boiling of water occurs at low temp. because:

The vant's Hoff factor for 0.1 Mba (NO3)2 solution is 2.74. The degree of dissociation is:

Which of the following concentration term is/are independent of temperature?

Binary liquid solutions which exhibit negative deviations from Raoult's law boil at temperature .... than the expected value:

The vapour pressure of benzene at a certain temperature is 640 mm of Hg. A non-volatile and nonelectrolyte solid weighing 2.175 g is added to 39.08 g of benzene. If the xapour pressure of the solution is 600 mm of Hg, what is the molecular weight of

The vapour pressure (VP) of a dilute solution of non-volatile solute is P and the VP of pure solvent is P0, the lowering of the VP is:

When two liquids A and B are mixed then their boiling points becomes greater than both of them. What is the nature of this solution?

When 10 g of a non-volatile solute is dissolved in 100 g of benzene, it raises boiling point by 1°C then molecular mass of the solute is (kb for C6 H6 = 2.53 kg–mol–1)

Which of the following is incorrect?

Van’t hoff factor of Ca(NO3)2 is:

If P0 and Ps are the vapour pressure of solvent and solution respectively and N1 and N2 are the mole of solute and solvent then:

Choose the correct statement. When concentration of a salt solution is increased

Which of the following shows maximum depression in freezing point?