Free Colligative Properties MCQs with Answers
12 Colligative Properties MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Colligative properties depend on the number of dissolved particles rather than their chemical identity. The topic covers relative lowering of vapour pressure, elevation of boiling point, depression of freezing point and osmotic pressure, including electrolyte dissociation, the van’t Hoff factor and molar-mass calculations.
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12 questions · page 2 of 2
11. Freezing point of a solution as compared to the solvent is:
- A. Lower
- B. Variable
- C. Higher
- D. Remain the same
Explanation: The freezing point of a solution is generally lower compared to the freezing point of the pure solvent. This happens because when a solute is added to a solvent, it disrupts the arrangement of the solvent particles, making it harder for them to form a solid structure. As a result, the solution needs to be cooled to a lower temperature in order to freeze.
Correct answer: Lower12. According to Raoult's law relative lowering of vapour pressure for a solution is equal to:
- A. mole fraction of the solvaent
- B. Mole fraction of the solute
- C. Moles of a solvant
- D. Moles of the solvent
Explanation: According to Raoult's law, the relative lowering of vapor pressure is equal to the mole fraction of the solute in the solution.Raoult's law describes the relationship between the vapor pressure of a solvent in a solution and the vapor pressure of the pure solvent. It states that the relative lowering of vapor pressure (Δp/Ppure is equal to the mole fraction of the solute (x solute ).Mathematically, it can be expressed as:Δp/ Ppure =x solute
Correct answer: Mole fraction of the solute