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What are colloids ?...

What are colloids ?

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A colloid is a heterogeneous system in which one substance is dispersed (dispersed phase) as very fine particles in another substance called dispersion medium.
The diameter of colloidal particles range between 1 - 1000 nm. Colloidal particles have a very large surface area per unit mass. This is due to their small size.
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A colloidal solution is a type of mixture which consists of particles whose size varies between 1 and 1000 nanometres. In colloidal solution the particles are distributed evenly. During this process the particles do not settle down. This is one of the best know thing about colloidal solutions. Properties of colloids and their variation are a well-known area ever since the primitive age. The best example to prove their familiarity with us is that we know from very early times that coagulation of milk results in the formation of curd. Physical properties of colloids 1. The nature of the colloidal solution is heterogeneous i.e. unlike. These solutions dwell with two different phases : • Dispersed medium Dispersed phase. 2. Despite the fact that colloidal dispersions are unlike in description (nature), yet the dispersed fragments are not detectable by the human eye. This is due to the microscopic size of the particles in the solution. 3. The colour of the colloidal dispersion is determined by particles in the solution based on their size. The wavelengths of light that is absorbed will be longer ifthe size of the particle is large. 4. As a result of its size, the colloidal fragments can easily be passed through a traditional filter paper. However, these particles can be filtered by using membranes such as animal, cellophane, and ultrafilters. What are colloidal solution particle.

Thomas Graham in 1861, during his work on diffusion found that certain substances such as gelatin, albumin, glue,etc. Diffused at very low rate and were called colloids. The colloid particles have the size in the range of 1 to 100nm consisting of dispersed phase and dispersion ,( medium. The dispersed phase or dispersion medium may be solid, liquid 6r even a gas. Depending upon the nature of dispersion medium or dispersed phase, 8 types of systems are possible except for a gas dispersed in another gas because the gases are completely miscible with each other. The substances which have strong interaction with the dispersion medium are called lyophilic colloids while those which do not pass into collofdalstate readily are called lyophobic colloids. Lyophobic sols are much less stable and are irreversible. What are colloid particles ?

What is colloidal solution, suspension and True solution?

In multi-molecular colloids, the colloidal particles are an aggregate of atoms or small molecules with a diameter of less than 1 nm. The molecules in the aggregate are held together by van der Waal's forces of attraction: Examples of such colloids include gold sol and sulphur sol. In macro-molecular colloids, the colloidal particles are large molecules having colloidal dimensions. These particles have a high molecular mass. When these particles are dissolved in a liquid, sol is obtained. For example: starch, nylon, cellulose, etc. Certain substances tend to behave like normal electrolytes at lower concentrations. However, at higher concentrations, these substances behave as colloidal solutions due to the foirnation of aggregated particles. Such colloids are called aggregated colloids. What are aggregated colloids ?

All colloids :

What are protective colloids ?

What are lyophobic Colloids?

What are lyophilic colloids?

BETTER CHOICE PUBLICATION-SURFACE CHEMISTRY -Question Bank
  1. Give the mechanism of heterogeneous catalysed reaction.

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  2. Explain two applications of enzymes.

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  3. What are colloids ?

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  4. which are the properties of colloidal solution ?

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  5. What is the difference between true solution and colloidal solution?

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  6. Give three differences between suspension and colloid solution.

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  7. Name the dispersed phase and dispersion mediumin fog.

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  8. Comment on the statement that “colloid is not a substance but a state ...

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  9. What are lyophilic and lyophobic sols ? Give one example of each. Why ...

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  10. What are gels ? Give an example of elastic and non-elastic gel.

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  11. How will you differentiate Lyophilic colloids from Lyophobic colloids?

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  12. Lyophillic colloids are more stable than lyophobic colloids. Explain.

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  13. What is the difference between multimolecular and macromolecular collo...

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  14. Give three differences between multimolecular colloids and macromolecu...

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  15. What are micelles ? Give one example of a micellar system.

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  16. Explain the mechanism of the cleansing action of soaps

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  17. Discuss cleansing action of soap by micelle formation.

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  18. Write short note on peptisation.

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  19. What is peptization ? What is cause of peptization ? Give one example.

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  20. How will you prepare a collidal solution of gold?

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