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.
Freshly prepared precipitate sometimes gets converted to colloidal solution by ......
1. Coagulation
2. Electrolysis
3. Diffusion
4. Peptisation
The electrolytes with maximum coagulating value for Ag/Ag+ sol is:
1. Na2S
2. Na3PO4
3. Na2SO4
4. NaCl
Which of the following phenomenon occurs when a chalk stick is dipped in ink?
a. Adsorption of coloured substance
b. Adsorption of solvent
c. Absorption and adsorption both of solvent
d. Absorption of solvent
The correct choice among the given is -
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)
Match the types of colloidal systems given in Column I with the names given in Column II.
Column I | Column II |
A. Solid in Liquid | 1. Foam |
B. Liquid in solid | 2. Sol |
C. Liquid in Liquid | 3. Gel |
D. Gas in Liquid | 4. Emulsion |
Codes
A | B | C | D | |
1. | 2 | 3 | 4 | 1 |
2. | 1 | 2 | 3 | 4 |
3. | 1 | 4 | 3 | 2 |
4. | 4 | 1 | 3 | 2 |