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Lyophilic sols are :...

Lyophilic sols are :

A

irreversible sols

B

prepared from inorganic compounds

C

coagulated by adding electrolytes

D

self-stabilishing

Text Solution

AI Generated Solution

### Step-by-Step Solution: 1. **Definition of Lyophilic Sols**: - Lyophilic sols are colloidal systems where the dispersed phase (solid particles) has a strong affinity for the dispersion medium (liquid). This affinity makes them stable and easy to prepare. 2. **Characteristics of Lyophilic Sols**: - **Stability**: Lyophilic sols are highly stable due to the strong interactions between the dispersed phase and the dispersion medium. - **Viscosity**: They are known to be highly viscous compared to other types of sols. ...
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Which of the following statement is/are correct regarding stability of sol ? Lyophilic sols are stabilised due to a layer of solvent around sol particles. (ii) Lyophobic sols are stabilised due to presence of charge. (iii) Addition of lyophilic brings in more stability to lyophobic (iv) Addition of lyophobic brings in more stability to lyophobic.

STATEMENT-1(Assertion ) and STATEMENT - 2 (reason). examine the statement carefully and work the correct answer accoridng to the instructions given below : STATEMENT-1: Lyophilic colloids are called as reversible sols. STATEMENT-2: Lyophilic sols are extensively hydrated.

Give the correct order of initials T(true) or F(false) for following statements. (a) Micelles formation takes place only above craft temperature (b)ZSM-5 is a type of zeolites used as a catalyst in petrochemical industries. (c)A micell is an aggregation of surfactants in in aqueous solution, often spherical (d) Lyophilic sols are irreversible sols

Assertion :- Lyophilic sol coagulate by adding other solvent. Reason :- Lyophilic sol are stable due to hydration energy.

STATEMENT-1 : Lyophilic sols can easily be coagulated. STATEMENT- 2 : Lyophobic sols are stabilised by addition of lyophilic solutions. STATEMENT- 3 : The colloidal solution of ice in an organic solvent such as CHCl_(3) is an example of hydrophobic sol.

Lyophobic sols are:

Assertion :- Lyophilic sol is more stable than lyophobic sol. Reason :- Lyophilic sol have greater solvation energy then lyophobic sol.

What happens when a Lyophilic sol is added to a Lyophobic sol?

Many lyophilic sols and few lyophobic sols when coagulated under some special conditions changes into semi rigid mass, enclosing whole amount of liquid within 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 exchanged of solvent method. Types 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. e.g., geletin, agar-agar show syneresis at low concentration while silicic 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 sweeling 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. e.g., gelatin and silica liquify on shaking changing into corresponding sol and the sol on keeping changes back into gel. Some types of gels like gelatin and silica liquify on shaking thereby changing into sols. The sols on standing change back into gels. This process is know as :

Knowledge Check

  • Which of the following statement is/are correct regarding stability of sol ? Lyophilic sols are stabilised due to a layer of solvent around sol particles. (ii) Lyophobic sols are stabilised due to presence of charge. (iii) Addition of lyophilic brings in more stability to lyophobic (iv) Addition of lyophobic brings in more stability to lyophobic.

    A
    (ii) only
    B
    (i) and (iv) only
    C
    (i), (ii) and (iii) only
    D
    All of these.

  • Which of the following statement are correct ? (i) Smaller the gold number of lyophilic colloid, larger will be its protective power (ii) Lyophilic sols , in contrast to lyophobic sols are easily coagulated on addition of small amounts of electrolytes. (iii) Ferric chloride solution is used to stop bleeding from a fresh cut because it coagulating the blood (iv) The flocculatin value of arsenious sulphide sol is independent of the anion of the coagulating

    A
    (i),(ii) and (iii)
    B
    (i) , (iii) and (iv)
    C
    (ii) , (iii) and (iv)
    D
    (i),(ii) and (iv)