Unit 9: Solution

21. What is the molarity of a solution that contains 2 moles of solute in 1 liter of solution?

a) 2 M
b) 1 M
c) 0.5 M
d) 2 L
Answer: a) 2 M

22. What is the molality of a solution that contains 3 moles of solute in 2 kg of solvent?

a) 3 mol/kg
b) 1.5 mol/kg
c) 6 mol/kg
d) 0.67 mol/kg
Answer: b) 1.5 mol/kg

23. Which term refers to the ratio of the mass of solute to the mass of the solution, expressed as a percentage?

a) Molarity
b) Molality
c) Weight percent
d) Normality
Answer: c) Weight percent

24. The property of a solution that depends on the number of solute particles in the solution rather than the nature of the solute is called:

a) Colligative properties
b) Solubility
c) Concentration
d) Vapor pressure
Answer: a) Colligative properties

25. What effect does the addition of a non-volatile solute have on the vapor pressure of a solvent?

a) Increases it
b) Decreases it
c) No effect
d) Changes the boiling point
Answer: b) Decreases it

26. The decrease in vapor pressure of a solvent when a non-volatile solute is added is known as:

a) Boiling point elevation
b) Freezing point depression
c) Vapor pressure lowering
d) Osmotic pressure
Answer: c) Vapor pressure lowering

27. What is the boiling point elevation of a solution?

a) The increase in the boiling point of a solution compared to the pure solvent
b) The decrease in the boiling point of a solution compared to the pure solvent
c) The temperature at which a solution freezes
d) The pressure required to keep the solvent from evaporating
Answer: a) The increase in the boiling point of a solution compared to the pure solvent

28. The lowering of the freezing point of a solvent when a solute is added is known as:

a) Boiling point elevation
b) Freezing point depression
c) Vapor pressure lowering
d) Osmotic pressure
Answer: b) Freezing point depression

29. Which of the following is true for a solution with a high osmotic pressure?

a) It has a high concentration of solute
b) It has a low concentration of solute
c) It has a high vapor pressure
d) It has a low boiling point
Answer: a) It has a high concentration of solute