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Which is not a gel ?...

Which is not a gel ?

A

Cheese

B

Butter

C

Boot polish

D

Blood

Text Solution

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The correct Answer is:
To determine which option is not a gel, we first need to understand the definition of a gel. A gel is a type of colloid where the disperse phase is liquid and the dispersion medium is solid. ### Step-by-Step Solution: 1. **Understand the Definition of Gel**: - A gel is a colloidal system where: - **Disperse Phase (dp)**: Liquid - **Dispersion Medium (dm)**: Solid 2. **Analyze the Options**: - **Option 1: Cheese** - Disperse Phase: Liquid - Dispersion Medium: Solid - Conclusion: Cheese fits the definition of a gel. - **Option 2: Butter** - Disperse Phase: Liquid - Dispersion Medium: Solid - Conclusion: Butter also fits the definition of a gel. - **Option 3: Boot Polish** - Disperse Phase: Liquid - Dispersion Medium: Solid - Conclusion: Boot Polish fits the definition of a gel. - **Option 4: Blood** - Disperse Phase: Solid - Dispersion Medium: Liquid - Conclusion: Blood does not fit the definition of a gel because the disperse phase is solid and the dispersion medium is liquid. 3. **Final Conclusion**: - The option that is not a gel is **Option 4: Blood**.
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Comprehension # 1 Many lyophilic sols and few lyophobic sols when coagulated under some special conditions changes into semi rigid mass, enclosing whole amount of liquid within itself, it is called gel and the process is called gelation, Gelatin Agar-agar, gum-Arabic can be converted into gels by cooling them under moderate concentration conditions. Hydrophobic sols like silicic acid. Al(OH)_(3) are prepared by double decomposition and exchange of solvent method. Types of Gel : (i) Elastic gel : Those gel which have elastic properties. Ex : Gelatin, Strach, Agar-agar etc. (ii) Non-elastic gel : Those gel which are rigid. Ex : Silica gel. Properties of Gel : 1. Syneresis/weeping of gel : The spontaneous liberation of liquid from a gel is called syneresis or weeping of gels. It is reverse of swelling. Ex : Gelatin, Agar-Agar show syneresis at low concentration while sillicic acid shows it at high concentration. 2. Imbibition or swelling of gel : When gel is kept in a suitable liquid (water) it absorb large volume of liquid. The phenomenon is called imbibition or swelling of gel. 3. Thixotropic : Some gels when shaken to form a sol, on keeping changes into gel are termed as thixotropic gel and phenomenon is called thixotropy. Ex : Gelatin and silica liquify on shaking changing into corresponding sol and sol on keeping changes back into gel. Which of the following is used to adsorb water ?

Comprehension # 1 Many lyophilic sols and few lyophobic sols when coagulated under some special conditions changes into semi rigid mass, enclosing whole amount of liquid within itself, it is called gel and the process is called gelation, Gelatin Agar-agar, gum-Arabic can be converted into gels by cooling them under moderate concentration conditions. Hydrophobic sols like silicic acid. Al(OH)_(3) are prepared by double decomposition and exchange of solvent method. Types of Gel : (i) Elastic gel : Those gel which have elastic properties. Ex : Gelatin, Strach, Agar-agar etc. (ii) Non-elastic gel : Those gel which are rigid. Ex : Silica gel. Properties of Gel : 1. Syneresis/weeping of gel : The spontaneous liberation of liquid from a gel is called syneresis or weeping of gels. It is reverse of swelling. Ex : Gelatin, Agar-Agar show syneresis at low concentration while sillicic acid shows it at high concentration. 2. Imbibition or swelling of gel : When gel is kept in a suitable liquid (water) it absorb large volume of liquid. The phenomenon is called imbibition or swelling of gel. 3. Thixotropic : Some gels when shaken to form a sol, on keeping changes into gel are termed as thixotropic gel and phenomenon is called thixotropy. Ex : Gelatin and silica liquify on shaking changing into corresponding sol and sol on keeping changes back into gel. The process of imbibing water when elastic gel are placed in water is called :

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