Unit – IV C

Problems:

  1. 1. Which of the following aqueous solutions will have maximum depression in freezing point.
    a) 0.5 M Li2SO4 b) 1 M NaCl  c) 0.5 M Al2(SO4)3 d) 0.5 M BaCl2
  2. A solution containing 0.73 g of camphor (molar mass 152 g mol-1) in 36.8 g of acetone (boiling point 56.3° C) boils at 56.55° C. A solution of 0.564 g of unknown compound in the same weight of acetone boils at 56.46° C. calculate molar mass of unknown compound.
  3. 1.0 x 10-3 kg of urea when dissolved in 0.0985 kg of a solvent, decreases freezing point of the solvent by 0.211 K. 1.6 x 10-3 kg of another non electrolyte solute when dissolved in 0.086 kg of the same solvent depresses the freezing point by 0.34 K. Calculate the molar mass of the another solute.
  4. Which of the following aqueous solutions will have minimum elevation in boiling point.
    a) 0.1 M KCl b) 0.05 M NaCl  c) 1 M AlPO4 d) 0.1 M MgSO4
  5. Boiling point of a solvent is 80.2° C. When 0.419 g of the solute of molar mass 252.4 g mol-1, is dissolved in 75 g of above solvent, the boiling point of solution is found to be 80.26° C. Find molal elevation constant.
  6. Molal elevation constant is elevation of boiling point produced by
    a) 1 g of solute in 100 g of solvent              b) 100 g of solute in 1000 g of solvent
    c) 1 mole of solute in 1 litre of solvent      d) 1 mole of solute in 1 kg of solvent
  7. 1. The freezing point of 0.2 m glucose solution is (Kf = 1.86 K m-1)
    a) 373.372 K b) 303.436 K  c) 272.628 K d) 273.372 K
  8.  If 0.1 m NaBr dissociates 80%, the boiling point of solution will be (Kb = 0.52 K kg mol-1)
    a) 373.052 K b) 373.104 K  c) 373.093 K d) 373.214 K
  9. 2. Which of the following solution has the highest freezing point?
    a) 0.4 m AlCl3 b) 0.2 M Al2(SO4)3  c) 0.2 m glucose d) 0.3 m KCl

 

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