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FAQ Colligative Properties JEE

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Colligative Properties

Ques 1: What are some of the most significant aspects of “colligative characteristics” to cover?


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    Ans 1: Important subjects in colligative characteristics of solutions, according to the JEE syllabus, include:

    • Relatively lowers the solvent’s vapour pressure.
    • The freezing point of the solvent has dropped.
    • The boiling point of the solvent is raised.
    • The solution’s osmotic pressure.
    • Factor Van ‘t Hoff.

    Part 1 of the NCERT class 12th chemistry textbook is required for colligative characteristics. A quick review of this chapter from NCERT not only offers you a good sense of the many topics you’ll need to cover for the JEE syllabus but also builds the chapter’s basics. Apart from that, you can use a reference book or a book containing previous year’s JEE questions to practice questions on this topic from authors and publications such as Peter Atkins, R.C. Mukherjee, Arihant Publication, and others.

    Ques 3: What are Colligative Properties?

    Ans 3 :

    • Some features of dilute solutions containing non-volatile solutes are dependent only on the number of solute particles present, not on the type of solute present. These are referred to as colligative qualities. These characteristics are particularly noticeable in dilute solutions.
    • We can also think of colligative qualities as those that result from the dissolution of a non-volatile solute in a volatile solvent. In general, the solute alters the solvent characteristics by removing some of the solvent molecules from the liquid phase. The solvent concentration is also reduced as a result of this.
    • Meanwhile, colligative qualities are stated to be inversely proportional to the solute molar mass when we talk about a certain solute-solvent mass ratio.

    Ques 4: On adding non-volatile solute to a solvent the following effect is observed;

    a. Increase in vapour pressure

    b. Increase in freezing point

    c. Decrease in osmotic pressure

    d. Decrease in vapour pressure

    Ans 4: Option (d)

    The molecules of a pure solvent occupy the whole surface of the solvent. When a nonvolatile solute is added to a solvent, the surface now contains both solute and solvent molecules, reducing the proportion of the surface covered by solvent molecules. Because the vapour pressure of the solution is completely due to the solvent, the vapour pressure of the solution is found to be lower than that of the pure solvent at the same temperature.

    Are Colligative properties physical or chemical?

    Colligative characteristics are the physical changes that occur when a solute is added to a solution. Colligative qualities are dependent on the number of solvent particles and the amount of solvent, but not on the form of the solvent particles. They do, however, depend on the kind of solvent.

    Why is Molality used in Colligative properties?

    Because colligative qualities are solely dependent on the number of particles in the solution, molality is not only employed in freezing depression points for colligative properties. Molality, like molarity, is unaffected by changes in temperature. When the temperature varies, the volume changes slightly, and the molarity changes.

    What are the other Colligative properties of the solution?

    The colligative properties of a solution are those that are affected by the concentration of molecules or ions in the solute, but not by the solute's identity. Vapour pressure is reduced, the boiling point is raised, the freezing point is lowered, and the osmotic pressure is reduced.

    What does freezing point depression mean?

    Depression as a result of Freezing Point The freezing point of a solution is lower than the freezing point of the pure solvent. This implies that a solution must be cooled to a lower temperature than the pure solvent in order to freeze.

    What are the colligative properties of a non-volatile solution?

    Some features of dilute solutions containing non-volatile solutes are dependent only on the number of solute particles present, not on the type of solute present. These are referred to as colligative qualities.

    Ques 10: By combining n-heptane and ethanol, a binary liquid solution is created. Which of the following claims about the behaviour of the solution is correct?

    1. The solution that has been created is ideal.
    2. The answer is non-ideal, deviating from Raoult’s law in a positive way.
    3. The answer is non-ideal, as it deviates from Raoult’s law in the negative direction.
    4. n-Heptane deviates from Raoult’s law in the positive direction, whereas ethanol deviates in the negative direction.

    Ans 10: In comparison to pure components, the interactions between n-heptane and ethanol are weaker.

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