Unit – IV C
- 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
- 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.
- 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.
- 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
- 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.
- 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
- 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
- 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
- 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