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Class 12 Chemistry Practice Test: Colligative Properties and Determination of Molar Mass
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Class 12 Chemistry Practice Test: Colligative Properties and Determination of Molar Mass
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20 Questions

1. What is a necessary condition for osmosis to take place?
2. What are colligative properties useful for?
3. Which of the following is Raoult’s law applicable to, in order to determine molar masses correctly?
4. When a non-volatile solute is added to a solvent what is the difference in vapor pressure expressed as a faction of original vapor pressure equal to?
5. On addition of non-volatile potassium iodide in water at 298K it is noticed that vapor pressure reduces from 23.8 mm Hg to 2.0 cm Hg. What is the mole fraction of solute in the solution?
6. If 1.5 grams of a non-volatile solute (MW = 100) is added to 200 ml pure CS2 (ρ = 1.3 g/cc) whose vapor pressure is 400 mm of Hg at 28.0°C, what is the resulting vapor pressure of the dilute solution?
7. Boiling point of chloroform is 61°C. After addition of 5.0 g of a non-volatile solute to 20 g chloroform boils at 64.63°C. If kb = 3.63 K kg mol-1, what is the molecular weight of the solute?
8. A cell with lots of salt inside it is placed in a vessel containing just water. Which process takes place?
9. When 2.0 grams of copper (II) nitrate is added to 1000 ml of pure water, by how much is the vapor pressure of water decreased, given that at 20°C the vapor pressure of pure water is 17.535 mm Hg?
10. Which law specifically governs the relative lowering of vapor pressures in solutions?
11. 117 g of NaCl is added to 222 g of water in a saucepan. At what does temperature does water boil at 101.325 kPa? Ebullioscopy constant for water = 0.52 K kg mol-1 and b.p. = 100°C
12. Which of the following is a colligative property?
13. At 70°C the vapor pressure of pure water is 31 kPa. Which of the following is most likely the vapor pressure of a 2.0 molal aq. glucose solution at 70°C?
14. A pair of solution bears the same osmotic pressure. What is this pair of solutions called?
15. What are the properties arising due to varying concentrations of solute in a given solvent, irrespective of the nature of solute with respect to the solvent?
16. Which is the most appropriate method for determining the molar masses of biomolecules?
17. If the relative lowering of pressure of o-xylene is 0.005 due to addition of 0.5 grams of non-volatile solute in 500 grams of solvent, what is the molecular weight of the solute?
18. Two components A and B have their pure vapor pressures in the ratio 1 ∶ 4 and respective mole fractions in solution in ratio 1 ∶ 2. What is the mole fraction of component B in vapor phase?
19. Why is ‘raising of viscosity’ of a solution after addition of solute, not considered to be a colligative property?
20. Pure CS2 melts at -112°C. 228 grams of propylene glycol crystals is mixed with 500 grams of CS2. If kf of CS2 = -3.83 K kg mol-1 what is the depression in freezing point?

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