Question

B) depression of the freezing poirit l C) an increase in the osmotic pressure of a solution D) upon th the increase of reaction rates with increase in temperature E) depression of vapor pressure upon addition of a solute to a solvent 100 90 80 S 60 50 E 30 20 10 0 10 20 30 40 50 60 70 80 90 100 Temperature (C) 8) A sample of potassium nitrate (49.0 g) is dissolved in 101 g of water at 100°C, with precautions28) taken to avoid evaporation of any water. The solution is cooled to 30.0°C and no precipitate is observed. This solution is - . A) hydrated B) supersaturated C) unsaturated D) placated E) saturated A sample of potassium nitrate (49.0 g) is dissolved in 101 g of water at 100 °C, with precautions taken to avoid evaporation of any water. The solution is cooled to 30.0 °C and a small amount of precipitate is observed. This solution is 2 A) supersaturated B) placated C) unsaturated D) hydrated E) saturated he mole fraction of urea (MW-60.0 g/mol) in a solution prepared by dissolving 16 g of urea in gof H2O is A) 0.11 B) 0.58 C)9.1 D) 0.37 E) 0.13

Answer 1

1. Hydrated means absorption of water molecule.
2. Unsaturated solution is the solution in which more amount of solute can be dissolved.
3. Saturated solution is the solution in which no more amount of solute can be dissolved at given temperature.
4. In saturated solution if we raise the temperature more amount of solute can be dissolved, the solution prepared this way is called supersaturated solution.
5. The solution prepared when maximum amount of solute dissolved at given temperature and remaining left behind at bottom of container is called placated solution.

The Answer of first question is -

At 30°C the solution is clear (no precipitate form) means the solution is (c)unsaturated solution.

The Answer of second question is-

At 30°C small amount of precipitate observed means the solution is (b) placated solution

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