Phenomenon that occurs when an electric field is applied to a colloidal solution and electrophoresis is prevented-
a. Reverse osmosis takes place
b. Electroosmosis takes place
c. Dispersion medium begins to move
d. Dispersion medium becomes stationary
The correct choice among the given is -
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)
The correct statement regarding changes in the catalyst during a reaction is -
a. Physical
b. Qualitative
c. Chemical
d. Quantitative
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)
Physical adsorption of a gaseous species may change to chemical adsorption with ..........
1. Decrease in temperature.
2. Increase in temperature.
3. Increase in surface area of adsorbent.
4. Decrease in surface area of adsorbent.
In physisorption adsorbent does not show specificity for any particular gas because..........
1. Involved van der Waals’ forces are universal.
2. Gases involved behave like ideal gases.
3. Enthalpy of adsorption is low.
4. It is a reversible process.
Among the following options the example of absorption is :
1. Water on silica gel.
2. Water on calcium chloride.
3. Hydrogen on finely divided nickel.
4. Oxygen on metal surface.
On the basis of the data given below, the gas which shows the least adsorption on a definite amount of charcoal is-
Gas |
CO2 |
SO2 |
CH4 |
H2 |
Critical temp./K |
304 |
630 |
190 |
33 |
1. CO2
2. SO2
3. CH4
4. H2
In which of the following reactions heterogeneous catalysis is involved ?
1. (ii), (iii)
2. (ii), (iii) and (iv)
3. (i), (ii) and (iii)
4. (iv)
At high concentration of soap in water, soap behaves as .......
1. Molecular colloid.
2. Associated colloid.
3. Macromolecular colloid.
4. Lyophilic colloid.
Tyndall effect is shown by
1. | Aqueous solution of soap below critical micelle concentration. |
2. | Aqueous solution of soap above critical micelle concentration. |
3. | Aqueous solution of sodium chloride. |
4. | Aqueous solution of sugar. |
Method by which lyophobic sol can be protected.
1. By addition of oppositely charged sol.
2. By addition of an electrolyte.
3. By addition of lyophilic sol.
4. By boiling.