If N₂ gas is bubbled through water at 293 K, how many millimoles of N₂ gas would dissolve in 1 liter  of water? Assume that N₂ exerts a partial pressure of 0.987 bar. Given Henry's law constant for N₂ at 293 K is 76.48 kbar.

2

(a)

What type of non-idealities are exhibited by cyclohexane-ethanol and acetone-chloroform mixture? Give reasons for your answer.

2

(a)

The boiling point of a solution of urea in water is 100.13^oC. Calculate the freezing point of  solution.(K_f and K_b for water are 1.86 K kg mol^-1 and 0.52 K kg mol^-1 respectively).

2

(a)

Calculate the normal boiling point of a sample of sea water containing 3.5% of NaCl and 0.13% of MgCl₂ by mass. Given Kb (water) = 0.52 K kg mol^-1 (Mol. Wt. of NaCl = 58.5 g mol^-1. MgCl₂ = 95g mpl^-1)

2

(a)

The degree of dissociation of Ca(NO₃)₂ in a dilute aqueous solution containing 14 g of the salt per 200 g of water at 100^oC is 70% If the vapour pressure of water is 760 mm Hg, calculate the vapour pressure of the solutions.

2

(a)

V₁ cc of solution having molarity M₁ is diluted to have molarity M₂. Derive expression (in terms of M₁,M₂ and V₁) for the volume of water required to be added.

2

(a)

Why is a molar solution of solute in water more concentrated than a molal solution?

2

(a)

Explain depression in freezing point of a solution on the addition of a solute. Show that depression in freezing point is a colligative property.

2

(a)

State Raoult's law for solutions of volatile liquids. Taking suitable examples explain the meaning of positive and negative deviations from Raoult's law.

2

(a)

What is the mole fraction of the solute in 2.5 m aqueous solution?

2

(a)

Differentiate between molarity and molality of a solution. How can we change molality value of a solution into molarity value?

2

(a)

Assuming complete dissociation, calculate the freezing point of a solution prepared by dissolving 6 g of glaubers salt (Na₂SO₄.10H₂O) in 0.100 kg of H₂O. Given kf = 1.86k kg mol^-1 Atomic mass of H₂O : 18 , Na : 23 , S : 32 , O : 16 , H : 1 all in amu units.

2

(a)

The temperature at a hill station is – 10⁰C. Will it be suitable to add ethylene glycol to water in the radiator sol that the solution is 30 % by mass. Why ?

2

(a)

45 g of ethylene glycol (C₂H₄O₂) is mixed with 600 g of water. Calculate
(i) the freezing point depression and 
(ii) the freezing point of the solution.

2

(a)