Question:

Statement I: For colloidal particles, the values of colligative properties are of small order as compared to values shown by true solutions at the same concentration 
Statement II: For colloidal particles, the potential difference between the fixed layer and the diffused layer of the same charges is called the electrokinetic potential or zeta potential
In the light of the above statements, choose the correct answer from the options given below

Updated On: Mar 19, 2025
  • Statement I is false but Statement II is true
  • Both Statement I and Statement II are true
  • Statement I is true but Statement II is false
  • Both Statement I and Statement II are false
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The Correct Option is B

Solution and Explanation

Statement I: For colloidal particles, colligative properties (e.g., vapor pressure lowering, boiling point elevation) are smaller than for true solutions because the effective number of solute particles is much smaller in colloids. This is due to the aggregation of dispersed phase particles. Conclusion: True. 
Statement II: The zeta potential (or electrokinetic potential) refers to the potential difference between the fixed layer of ions attached to the colloidal particles and the diffused layer of counterions. It plays a crucial role in colloidal stability. 
Conclusion: True. 
Final Conclusion: Both statements are correct.

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Concepts Used:

Surface Chemistry

The study of the chemical phenomena that occur at the interface of two surfaces which can be solid-liquid, solid-gas, solid-vacuum, liquid-gas, etc. 

Read Also: Surface Chemistry

Applications of surface chemistry are:

Adsorption:

The process of attraction and aggregation of the molecules of a substance on the surface of a solid is known as adsorption. For Example, N2 adsorbs on the surface of activated charcoal

Two types of adsorption are:-

  • Chemisorption: It is also known as Chemical Adsorption.
  • Physisorption: It is also known as Physical Adsorption.

Corrosion:

The process through which the refined metals convert themselves into more stable compounds is known as corrosion.

Crystallisation:

The type of technique used in order to purify the substances to separate Solids from liquids is known as crystallisation.

Heterogeneous Catalysis:

The process wherein a catalyst is used in order to increase the rate of a chemical reaction is known as catalysis. The catalyst does not undergo any transformation and can be recovered in a chemically unchanged state. 

There are two types of catalysis:-

  • When the catalyst involved and the reacting substances are same states of matter or in the same phase, it is known as Homogeneous Catalysis.
  • When the catalyst involved and the reacting substances are in different states of matter or different phases, it is known as Heterogeneous Catalysis.