Advertisements
Advertisements
प्रश्न
Distinguish between Lyophobic and Lyophilic sols.
उत्तर
| No. | Lyophobic sols (colloids) | Lyophilic sols (colloids) |
| 1. | Lyophobic sols are formed only by special methods. | Lyophilic sols are formed easily by direct mixing. |
| 2. | They are irreversible. | They are reversible. |
| 3. | These are unstable and hence, require traces of stabilizers. | These are self-stabilized. |
| 4. | 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. | 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. | 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 Brownian motion.
Write a note on Types of emulsion.
What happens when a beam of light is passed through a colloidal sol.
Identify the CORRECT statement.
In coagulation of positively charged ferric hydroxide sol, the most and least effective ions are ____________ and ____________ respectively.
Which of the following is a heterogeneous mixture?
The order of coagulating power of following ions in the coagulation of a positive sol is:
i. \[\ce{PO^{3-}_4}\]
ii. \[\ce{SO^{2-}_4}\]
iii. \[\ce{[Fe(CN)6]^{4-}}\]
iv. \[\ce{NO^-_3}\]
Smoke is an example of ____________.
Froth is a colloidal solution of ____________.
Tyndall effect is useful ______.
Pumice stone is an example of ______.
Which of the following compounds forms a colloidal solution when dissolved in water?
Which of the following ionic species has highest precipitating power?
Freshly prepared precipitate sometimes gets converted to colloidal solution by ______.
Which of the following electrolytes will have maximum coagulating value for AgI/Ag+ solution?
An emulsion cannot be broken by:
(i) heating
(ii) adding more amount of dispersion medium
(iii) freezing
(iv) adding emulsifying agent
Which of the following substances will precipitate the negatively charged emulsions?
(i) \[\ce{KCl}\]
(ii) glucose
(iii) urea
(iv) \[\ce{NaCl}\]
How do emulsifying agents stabilise the emulsion?
On the basis of Hardy-Schulze rule explain why the coagulating power of phosphate is higher than chloride.
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 |
Colloids can
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.
The size of a raw mango shrinks to a much smaller size when kept in a concentrated salt solution. Which one of the following processes can explain this?
Which of the following is most powerful to coagulate the negative colloid?
Smoke is an example of ______.
Blood may be purified by ______.
