Advertisements
Advertisements
प्रश्न
Distinguish between lyophobic and lyophilic sols.
What are the main points of difference between lyophilic and lyophobic sols?
Advertisements
उत्तर
| Sr. No. | Points | Lyophobic sols | Lyophilic sols |
| 1. | Method of formation | Lyophobic sols are formed only by special methods. | Lyophilic sols are formed easily by direct mixing. |
| 2. | Reversibility | They are irreversible. | They are reversible. |
| 3. | Stability | These are unstable and hence, require traces of stabilizers. | These are self-stabilized. |
| 4. | Effect of electrolytes | The addition of a small amount of electrolytes causes precipitation or coagulation of lyophobic sols. | The addition of a large amount of electrolytes causes precipitation or coagulation of lyophilic sols. |
| 5. | Viscosity | The viscosity of lyophobic sol is nearly the same as the dispersion medium. | The viscosity of lyophilic sol is much higher than that of the dispersion medium. |
| 6. | Surface tension | The surface tension of lyophobic sol is nearly the same as the dispersion medium. | The surface tension of lyophilic sol is lower than that of the dispersion medium. |
APPEARS IN
संबंधित प्रश्न
Define the following with a suitable example, of each:
Gel
Write a note on the Tyndall effect.
Write a note on Brownian motion.
Write a note on Types of emulsion.
What are the applications of Electrophoresis?
Draw labelled diagram of Bredig’s arc method.
Which type of colloid is formed on the dissolution of soap in water?
Froth and whipped cream are examples of ____________.
Which of the following is multimolecular colloid?
In coagulation of positively charged ferric hydroxide sol, the most and least effective ions are ____________ and ____________ respectively.
Which of the following is an example of liquid-liquid system?
Maximum coagulation power is in ____________.
Smoke is an example of ____________.
The movement of colloidal particles towards respective electrode under electric field is called ______.
In which of the following sols there is low affinity between dispersed phase and dispersion medium?
A colloidal system having a solid substance as a dispersed phase and a liquid as a dispersion medium is classified as ______.
Which of the following process is responsible for the formation of delta at a place where rivers meet the sea?
What is collodion?
Why are some medicines more effective in the colloidal form?
Match the items of Column I and Column II.
| Column I | Column II |
| (i) Butter | (a) dispersion of liquid in liquid |
| (ii) Pumice stone | (b) dispersion of solid in liquid |
| (iii) Milk | (c) dispersion of gas in solid |
| (iv) Paints | (d) dispersion of liquid in solid |
The coagulation of 200 ML of position sol took place when 0.73 HCL was added to its without changing the volume much. The flocculation value of HCL for the colloid is.
For coagulating 200 ml of arsenious sulphide sol, 10 ml of 1 m NaCl solution is required find out the flocculation value of NaCl.
Which of the following substances will precipitate the negatively charge emulsion
In which of the following, the Tyndall effect is not observed?
Blood may be purified by ______.
Van Arkel's method of purification of metals involves converting the metal to a ______.
Identify the correct decreasing order of precipitation power of flocculating ion added, from following.
