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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

1. Osmotic pressure (7) does NOT depend on

  • A. Molarity
  • B. unoveal gas constant
  • C. Temperature
  • D. structure of solute particle

Explanation: osmotic pressure does not depend on structure of solute particles but it depend on molarity ,temperature,and solute concentration

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Correct answer: structure of solute particle

2. _ properties depend upon the nature of compound.

  • A. Extensive
  • B. Intensive
  • C. Colligative
  • D. Physical

Explanation: The explanation for this question will be added soon.

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Correct answer: Colligative

3. Osmotic pressure of a solution is _ property.

  • A. Obligative.
  • B. Fractional.
  • C. Colligative
  • D. Automated.

Explanation: Osmotic pressure is a 'colligative' property, like freezing point depression, which means that it depends on the number of particles in…

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Correct answer: Colligative

4. The vapor pressure lines for pure as well as solutionsof different concentrations are shown. Which line represents pure water?

  • A. 1
  • B. 2
  • C. 3
  • D. 4

Explanation: Pure water (with the highest vapor pressure) will boil at the lowest temperature.Boiling occurs when vapor pressure = external…

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Correct answer: 1

5. Lowering in vapour pressure is the highest for:

  • A. 0.2 M urea
  • B. 0.1 M Glucose
  • C. 0.1 M MgSO4
  • D. 0.1 M BaCl2

Explanation: The higher the vanthoff factor, the greater the lowering of vapor pressure.

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Correct answer: 0.1 M BaCl2

6. Water has a vapor pressure of 23.75 at 250c what is the vapor pressure of a solution sucrose if its mole fraction is 0.25?

  • A. 15.2 torr
  • B. 17.8 torr
  • C. 23.8 torr
  • D. 29.7 torr

Explanation: Mole fraction of the solute = xs = 0.25Pressure of the solvent = PH2O = 23.76 torrFirst, we solve for the mole fraction of the…

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Correct answer: 17.8 torr

7. Pure water freezes at 0 oC and boils at 100 oC at standard conditions. Calcium chloride was added to pure water. What do you expect about its freezing point and boiling point?

  • A. No change in its freezing point and boiling point
  • B. Freezing point increases and boiling point decreases.
  • C. Freezing point increases and boiling point increases
  • D. Freezing point decreases and boiling point increases

Explanation: The presence of impurities in a substance lowers the melting point but increases the boiling point of the substance.

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Correct answer: Freezing point decreases and boiling point increases

8. The osmotic pressure of dilute solution is given by the formula:

  • A. π = nRT/V
  • B. π = PRT
  • C. π = CRT
  • D. π = PV=nRT

Explanation: The correct formula for the osmotic pressure of a dilute solution is π = CRT, where:C is the molar concentration of the solute.R is the…

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Correct answer: π = CRT

9. The osmotic pressure of dilute solution is given below by relationship:

  • A. π = iCRT
  • B. π = RCT/M
  • C. π = nRT/V
  • D. π = PV = nRT

Explanation: The correct relationship for the osmotic pressure of a dilute solution is given by the equation π = RCT/M.

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Correct answer: π = RCT/M

10. Which of the following solution will have

  • A. 1 molar solution of urea
  • B. 1 molar solution of glucose
  • C. 1 molar solution of sodium chloride
  • D. 1 molar solution of magnesium chloride

Explanation: The correct answer is the 1 molar solution of urea. Urea is a non-electrolyte, meaning it does not dissociate into ions in solution.

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Correct answer: 1 molar solution of urea

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.

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Correct answer: Lower

12. 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…

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Correct answer: Mole fraction of the solute
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Colligative Properties MCQs: common questions

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