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प्रश्न
Explain the term emulsion and types of emulsions.
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उत्तर
- A colloidal system in which one liquid is dispersed in another immiscible liquid is called an emulsion.
- There are liquid-liquid colloidal systems in which both liquids are either completely or partially immiscible.
- There are two types of emulsions:
- Emulsion of oil in water (o/w type):
An emulsion in which a dispersed phase is oil and the dispersion medium is water is called emulsion of oil in water.
Example:
1. Milk consists of particles of fat dispersed in water.
2. Other examples include vanishing cream, paint, etc. - Emulsion of water in oil (w/o type):
An emulsion in which the dispersed phase is water and dispersion medium is the oil is called emulsion of water in oil.
Example:
1. Cod liver oil consists of particles of water dispersed in oil.
2. Some other examples of this type include butter, cream, etc.
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संबंधित प्रश्न
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Multimolecular colloid
Define the following with a suitable example, of each:
Gel
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Draw labelled diagram Dialysis.
Froth and whipped cream are examples of ____________.
Identify the CORRECT statement.
Identify the CORRECT statements from the following.
i. The colour of colloidal dispersion depends on size of colloidal particles.
ii. Tyndall effect is used to distinguish between colloidal dispersion and true solution.
iii. Eosin and congo red are examples of negatively charged sols.
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Maximum coagulation power is in ____________.
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(i) \[\ce{KCl}\]
(ii) glucose
(iii) urea
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| 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 |
Cloud is an example of
For coagulating 200 ml of arsenious sulphide sol, 10 ml of 1 m NaCl solution is required find out the flocculation value of NaCl.
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Starch is an example of which of the following type of colloid?
