The term ‘sorption’ stands for.........
1. Absorption
2. Adsorption
3. Both absorption and adsorption
4. Desorption
Extent of adsorption of adsorbate from the solution phase increases with:
1. Increase in amount of adsorbate in solution.
2. Decrease in surface area of adsorbent.
3. Increase in temperature of solution.
4. Decrease in amount of adsorbate in solution.
Which one of the following is not applicable to the phenomenon of adsorption?
Physical adsorption is not favoured by :
1. High pressure.
2. Negative H
3. Higher critical temperature of adsorbate.
4. High temperature.
Extent of physisorption of a gas increases with ......
1. Increase in temperature.
2. Decrease in temperature.
3. Decrease in surface area of adsorbent.
4. Decrease in strength of van der Waals’ force.
Freundlich adsorption isotherm is given by the expression Which of the following conclusions can be drawn from this expression?
The correct choice among the given is -
1. (a), (b)
2. (b), (c)
3. (c), (d)
4. (a), (c)
H2 gas is adsorbed on activated charcoal to a very little extent in comparison to easily liquefiable gases due to -
a. Very strong van der Waals’ interaction
b. Very weak van der Waals’ forces
c. Very low critical temperature
d. Very high critical temperature
The correct choice among the given is -
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)
The correct statements among the following are :
a. | Mixing two oppositely charged sols neutralizes their charges and stabilizes the colloid. |
b. | The presence of equal and similar charges on colloidal particles provides stability to the colloids. |
c. | Any amount of dispersed liquid can be added to the emulsion without destabilizing it. |
d. | Brownian movement stabilizes sols. |
1. (a, b)
2. (b, c)
3. (c, d)
4. (b, d)
An emulsion cannot be broken by ............. and ................
1. Heating.
2. Adding more amount of dispersion medium.
3. Freezing.
4. Centrifugation
Substances among the following that can precipitate the negatively charged emulsions are-
a. KCI
b. Glucose
c. Urea
d. NaCl
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)