The correct statements among the following about solid catalysts is -
a. | Same reactants may give different products by using different catalysts |
b. | Catalyst does not change ∆ H of reaction |
c. | Catalyst is required in large quantities to catalyse reactions |
d. | Catalytic activity of a solid catalyst does not depend upon the strength of chemisorption |
1. a and b
2. b and c
3. c and d
4. a and d
At the equilibrium position in the process of adsorption ..........
1. ΔH > 0
2. ΔH = TΔS
3. ΔH > TΔS
4. ΔH < TΔS
The process that does not occur at the interface of phases is :
1. Crystallisation
2. Heterogeneous catalysis
3. Homogeneous catalysis
4. Corrosion
The interface that cannot be obtained is
1. Liquid-liquid
2. Solid-liquid
3. Liquid-gas
4. Gas-gas
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)