Advertisements
Advertisements
प्रश्न
What is the role of diffusion in heterogenous catalysis?
Advertisements
उत्तर
The gaseous molecules diffuse on to the surface of the solid catalyst and get adsorbed. After the required chemical changes the products diffuse away from the surface of the catalyst leaving the surface free for more reactant molecules to get adsorbed and undergo reaction.
APPEARS IN
संबंधित प्रश्न
Differentiate between adsorbtion and absorption.
Why is adsorption always exothermic?
Give reason why a finely divided substance is more effective as an adsorbent.
Discuss the effect of temperature on the adsorption of gases on solids.
How does chemisorption vary with temperature?
Answer in one sentence:
Name type of adsorption in which vander Waals focres are present.
Which of the following is an example of physisorption?
Adsorption increases when ____________.
Which among the following is a property of physisorption?
Powdered substances are more effective adsorbents than their crystalline forms because ____________.
Chromatography is based on the principle of ____________.
Physical adsorption of a gaseous species may change to chemical adsorption with ______.
Why is it important to have clean surface in surface studies?
Why do physisorption and chemisorption behave differently with rise in temperature?
Assertion: Detergents with low CMC are more economical to use.
Reason: Cleansing action of detergents involves the formation of micelles. These are formed when the concentration of detergents becomes equal to CMC.
Rate of physisorption increase with:-
Write three differences between physisorption and chemisorption.
Which of the following statements is not true about physisorption?
