Unsaturated, Saturated, And Supersaturated Solutions Jamb Chemistry Past Questions
Question 1
When 50cm3 of a saturated solution of sugar (molar mass 342.0g) at 40oC was evaporated to dryness, 34.2g of dry solid was obtained. The solubility of sugar at 40oC is
- A. 10.0 moles dm-3
- B. 7.0 moles dm-3
- C. 3.5 moles dm-3
- D. 2.0 moles dm-3
Question 2
On which of the following is the solubility of a gaseous substance dependent?
I. Nature of solvent
II. Nature of solute
III. Temperature
IV. Pressure
- A. Nature of solvent
- B. I, II, III and IV
- C. I and II only
- D. II only
- E. III and IV only
Question 3
Methanoic acid mixes with water in all proportions and has about the same boiling point as water. Which of the following methods would you adopt to obtain pure water from a mixture of Sand, water and methanoic acid?
- A. Extractive distillation
- B. Filtration followed by distillation
- C. Neutralization with sodium hydroxide followed by distillation
- D. Neutralization with sodium hydroxide followed by filtration
Question 4
The solubility of the solids that dissolves in a given solvent with the liberation of heat will
- A. increase with an increase in temperature
- B. decrease with an increase in temperature
- C. decrease with a decrease in temperature
- D. not be affected by changes in temperature
Question 5
Which of the following separation techniques can be employed in obtaining solvent from its solution?
- A. Evaporation
- B. Distillation
- C. Filtration
- D. Precipitation
