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Give the mechanism of heterogeneous cata...

Give the mechanism of heterogeneous catalysed reaction.

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The phenomenon of adsorption plays important role in heterogeneous catalysis.
1. Adsorption increases the concentration of reactant on the surface of the catalyst. Due to increased concentration of the reactants, the reactions proceed rapidly.
2. Adsorbed molecules get dissociated to form active species like free radicals which react faster than molecules.
3. The adsorbed molecules are not free to move about and, therefore, they collide with other molecules on the surface.
4. The heat of adsorption evolved acts as energy of activation for the reaction.
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Read the given passage and answers following questions : A catalytic process in which the catalyst and the reactants are present in different phases is known as a heterogeneous catalysis. This heterogeneous catalytic action can be explained in terms of the adsorption theory. The mechanism of catalysis involves the following steps: (i) Adsorption of reactant molecules on the catalyst surface. (ii) Occurrence of a chemical reaction through the formation of an intermediate. (iii) De-sorption of products from the catalyst surface (iv) Diffusion of products away from the catalyst surface. In this process, the reactants are usually present in the gaseous state and the catalyst is present in the solid state. Gaseous molecules are then adsorbed on the surface of the catalyst. As the concentration of reactants on the surface of the catalyst increases, the rate of reaction also increases. In such reactions, the products have very less affinity for the catalyst and are quickly desorbed, thereby making the surface free for other reactants. What is heterogeneous catalysis.

BETTER CHOICE PUBLICATION-SURFACE CHEMISTRY -Question Bank
  1. Define Catalyst and Catalysis.

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  2. What is heterogeneous catalysis ? What role does adsorption play in he...

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  3. Give the mechanism of heterogeneous catalysed reaction.

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  4. Give four examples of heterogeneous catalysis.

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  5. What name is given to the catalysis when the state of the catalyst is ...

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  6. What name is given to the catalysis when the state of the catalyst is ...

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  7. What name is given to the catalysis which is explained by lock-and-key...

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  8. Write two differences between homogeneous catalysis and heterogeneous ...

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  9. What is homogeneous and heterogeneous catalysis ? Give one example of ...

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  10. Write two differences between homogeneous catalysis and heterogeneous ...

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  11. Explain briefly homogeneous catalysis.

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  12. What do you understand by activity and selectivity of a catalyst ? Giv...

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  13. What is shape selective catalysis?

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  14. Describe some features of catalysis by zeolites.

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  15. How do enzymes differ from catalysts ?

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  16. What are Enzymes ? Give important characteristics of enzyme catalysis.

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  17. Give the mechanism of heterogeneous catalysed reaction.

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  18. Explain two applications of enzymes.

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  19. What are colloids ?

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  20. which are the properties of colloidal solution ?

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