Practice Abnormal Molar Mass and van’t Hoff Factor (i) - 2.8 | Chapter 2: Solutions | ICSE Class 12 Chemistry
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2.8 - Abnormal Molar Mass and van’t Hoff Factor (i)

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Practice Questions

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Question 1

Easy

What is the van’t Hoff factor for a solution where the observed colligative property is greater than expected?

💡 Hint: Think about whether particles are increasing or decreasing.

Question 2

Easy

Define dissociation in the context of solutions.

💡 Hint: Consider how ionic compounds behave in water.

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Interactive Quizzes

Engage in quick quizzes to reinforce what you've learned and check your comprehension.

Question 1

What does a van’t Hoff factor greater than 1 indicate?

  • Association of solute
  • Dissociation of solute
  • No effect on solute

💡 Hint: Think about how ions behave in solution.

Question 2

True or False: The van’t Hoff factor can be less than 1.

  • True
  • False

💡 Hint: Consider examples of solutes that might not behave ideally.

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Challenge Problems

Push your limits with challenges.

Question 1

A solution of potassiumnitrate (KNO₃) has a van’t Hoff factor of 3 due to its dissociation into K+ and 2NO3-. Calculate the boiling point elevation for 1 m of KNO₃ if K_b = 0.52 °C kg/mol.

💡 Hint: Make sure to account for the dissociation factor in the calculation.

Question 2

Consider a solution of glucose (C₆H₁₂O₆), which has a van’t Hoff factor equal to 1. If this solution has a molality of 2, calculate the freezing point depression. The K_f for water is 1.86 °C kg/mol.

💡 Hint: Remember, glucose does not dissociate, so use i = 1.

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