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प्रश्न
What is the role of diffusion in heterogenous catalysis?
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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.
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संबंधित प्रश्न
Differentiate between adsorbtion and absorption.
Why is adsorption always exothermic?
Why are powdered substances more effective adsorbents than their crystalline forms?
Distinguish between the meaning of the terms adsorption and absorption. Give one example of.
What are the factors which influence the adsorption of a gas on a solid?
Discuss the effect of temperature on the adsorption of gases on solids.
Physisorption is reversible while chemisorption is irreversible. Why ?
Answer in one sentence:
Name type of adsorption in which vander Waals focres are present.
Which of the following is true about chemisorption?
Adsorption increases when ____________.
Which among the following is a property of physisorption?
Powdered substances are more effective adsorbents than their crystalline forms because ____________.
Which among the following is true for chemisorption?
Extent of physisorption of a gas increases with ______.
Physical adsorption of a gaseous species may change to chemical adsorption with ______.
In which of the following reactions heterogenous catalysis is involved?
(a) \[\ce{2SO2 (g) + O2 (g) ->[NO(g)] 2SO3 (g)}\]
(b) \[\ce{2SO2 (g) ->[Pt(s)] 2SO3 (g)}\]
(c) \[\ce{N2 (g) + 3H2 (g) ->[Fe(s)] 2NH3 (g)}\]
(d) \[\ce{CH3COOCH3 (l) + H2O (l) ->[HCI(l)] CH3COOH (aq) + CH3OH (aq)}\]
Give an example where physisorption changes to chemisorption with rise in temperature. Explain the reason for change.
Chromatography is based on:-
Write three differences between physisorption and chemisorption.
