Q. No.Identify the correct statement about zeolites -
1. Zeolites are alumino-silicates that are micro-porous in nature.
2. The reactions taking place in zeolites are very sensitive to the pores and cavity size of the zeolites.
3. Zeolites are commonly used in the petrochemical industry.
4. All of the above.
Shape selective catalysis is:
| 1. | Catalytic reaction depends upon the pore structure of the catalyst. |
| 2. | Catalytic reactions depend on the size of the reactant and the product molecules. |
| 3. | Both '1' and '2' |
| 4. | None of the above. |
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 |
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