The phenomenon of the scattering of light by a colloidal solution known as:
1. Zeeman effect.
2. Tyndall effect.
3. Electrophoresis.
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. |
The charge present on micelles is:
1. Negative charge.
2. Positive charge.
3. Both negative and positive charges.
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 |
Identify the correct statement -
1. The activity of a catalyst is its ability to increase the rate of a particular reaction.
2. Chemisorption is the main factor in deciding the activity of a catalyst.
3. The catalysts are selective in nature
4. All of the above.
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. |