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. |
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. |
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.
Heterogeneous catalysis is shown in:
1. | \(2SO_{2}{(g)} \ + \ O_{2}{(g)} \ \xrightarrow[]{Pt(s)} \ 2SO_{3}{(g)}\) |
2. | \(4NH_{3}{(g)} \ + \ 3H_{2}{(g)} \ \xrightarrow[]{Fe(s)} \ 2NH_{3}{(g)}\) |
3. | \(Vegetable \ oil(l) \ + \ H_{2}(g) \ \xrightarrow[]{Ni(s)} \ Vegetable \ ghee(s)\) |
4. | All of the above |
The charge present on micelles is:
1. Negative charge.
2. Positive charge.
3. Both negative and positive charges.
4. None of the above.
Correct statement about emulsion is:
1. | The dispersed phase and dispersion medium are liquids. |
2. | The dispersed phase and dispersion medium are solids. |
3. | The dispersed phase and dispersion medium are gases. |
4. | The dispersed phase are solids and dispersion medium are liquids. |