Q. No.Emulsions can be used as:
1. For cleansing action of soaps.
2. For digestion of fats in the intestines.
3. As antiseptics and disinfectants.
4. All of the above.
The correct statements about micelles are:
| 1. | Formed by substances such as soaps and detergents when dissolved in water. |
| 2. | Substances whose molecules contain a hydrophobic and a hydrophilic part. |
| 3. | Molecules whose hydrophobic parts are present towards the center, while the hydrophilic parts are pointing towards the outside. |
| 4. | All of the above. |
Incorrect statement regarding colloids is:
| 1. | When the size of the solute particle lies between 1 nm and 1000 nm, it behaves as a colloid. |
| 2. | A colloid is not a substance but a state of the substance that is dependent on the charge of the particle. |
| 3. | A colloidal state is an intermediate state between a true solution and a suspension. |
| 4. | All of the above. |
Among the given options the incorrect statement regarding physisorption/chemisorption is:
1. Physisorption is reversible in nature.
2. Chemisorption is multi-layer adsorption.
3. In chemisorption, strong chemical bonds are formed between the adsorbate and the surface of the adsorbent.
4. Physisorption is favoured by low temperature conditions.
The correct statement about heterogeneous catalysis is :
| 1. | The catalyst and reactants are present in different phases. |
| 2. | The catalyst and reactants are present in the same phase. |
| 3. | The products and reactants are present in different phases. |
| 4. | None of the above. |
Colloids can be classified on the basis of:
| 1. | Physical states of components. |
| 2. | Nature of dispersed phase. |
| 3. | Interaction between the dispersed phase and dispersion medium. |
| 4. | All of the above. |
A colloidal solution having a gas as the dispersion medium and a solid as the dispersed phase is known as -
1. Benzosol
2. Aerosol
3. Hydrosol
4. All of the above
The correct match amongst the following is -
| Physical states of the dispersed phase and dispersion medium | Type of colloid |
| a. D.P = solid; D.M = liquid | i. Foam |
| b. D.P = solid; D.M = gas | ii. Emulsion |
| c. D.P = liquid; D.M = liquid | iii. Aerosol |
| d. D.P = gas; D.M = liquid | iv. Sol |
(D.P = dispersed phase, and D.M = dispersion medium)
Options:
| a | b | c | d | |
| 1. | iv | iii | ii | i |
| 2. | iii | iv | ii | i |
| 3. | iv | ii | iii | i |
| 4. | i | iii | ii | iv |
An emulsion is stabilised by:
1. Emulsifiers.
2. Peptizing agent.
3. Biochemical catalysts.
4. None of the above.
Consider the following statements.
a. Dialysis: It is the process of removing a dissolved substance from a colloidal solution by means of diffusion through a suitable membrane.
b. The process of settling colloidal particles is called coagulation or precipitation of the sol.
c. The movement of colloidal particles under an applied electric potential is called electrophoresis.
d. Tyndall effect is used to distinguish between a colloidal and true
solution.
The incorrect statement(s) is/are-
1. a, b
2. b, c
3. a, b, c
4. None of the above
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