**Q1.**Vapour pressure of chloroform (CHCl_3) and dichloromethane (CH_2 Cl_2) at 25°C are 200 mm Hg and 41.5 mm Hg respectively. Vapour pressure of the solution obtained by mixing 25.5 g of CHCl_3 and 40 g of CH_2 Cl_2 at the same temperature will be : (Molecular mass of CHCl_3=119.5 u and molecular mass of CH_2 Cl_2=85 u)

Solution

**Q2.**A solution is prepared by dissolving 24.5 g of sodium hydroxide in distilled water to give 1L solution. The molarity of NaOH in the solution is (Given, that molar mass of NaOH = 40.0 g 〖mol〗^(-1))

Solution

**Q3.**The molal elevation constant for water is 0.52 K molality^(-1). The elevation caused in the boiling point of water by dissolving 0.25 mole of a non-volatile solute in 250 g of water will be :

Solution

∆T_f=(1000 ×0.52×0.25)/250=0.52 ͦC

∆T_f=(1000 ×0.52×0.25)/250=0.52 ͦC

**Q4.**The phenomenon in which cells are shrinked down if placed in hypertonic solution is called :

Solution

The exosmosis occurs from cell to solution (hypertonic or high osmotic pressure or high concentration)..

The exosmosis occurs from cell to solution (hypertonic or high osmotic pressure or high concentration)..

**Q5.**Two solutions of glucose have osmotic pressure 1.0 and 3.5 atm. If 1 L of first solution is mixed with V L of second solution, the osmotic pressure of the resultant solution becomes 2.5 atm. Volume of second solution isTwo solutions of glucose have osmotic pressure 1.0 and 3.5 atm. If 1 L of first solution is mixed with V L of second solution, the osmotic pressure of the resultant solution becomes 2.5 atm. Volume of second solution is

Solution

**Q6.**The difference between the boiling point and freezing point of an aqueous solution containing sucrose (mol wt. = 342 gmol^(-1)) in 100 g of water is 105.0^∘ C. If K_f and K_b of water are 1.86 and 0.51 K kg mol^(-1) respectively, the weight of sucrose in the solution is about

Solution

**Q7.**At temperature 327℃ and concentration C osmotic pressure of a solution is p, the same solutions at concentration C/2 and a temperature 427℃ shows osmotic pressure 2 atm, value of p will be

Solution

**Q8.**A non-ideal solution was prepared by mixing 30 mL chloroform and 50 mL acetone. The volume of mixture will be

Solution

**Q9.**The solubility of a gas in liquid at a temperature is directly proportional to its :

Solution

Amount of gas dissolved per unit volume ∝pressure of gas; this is Henry’s law.

Amount of gas dissolved per unit volume ∝pressure of gas; this is Henry’s law.

**Q10.**Binary liquid mixtures which exhibit positive deviations from Raoult’s law boil at…. temperature than the expected b. p.:

Solution

Liquid mixtures showing positive deviations from Raoult’s law posses lower b. p..

Liquid mixtures showing positive deviations from Raoult’s law posses lower b. p..