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Define Catalyst and Catalysis....

Define Catalyst and Catalysis.

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A catalyst is a substance that increases the rate of reaction without being consumed in the reaction. The phenomenon of increase in the rate of a reaction with the help of a catalyst is known as catalysis. For example, in contact process for the manufacture of sulphuric acid `V_2 O_5`, is used as a catalyst.
`2SO_2 (g) + O_2 (g) overset(V_2 O_5)hArr 2SO_3 (g)`
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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. How many steps involved in mechanism of catalysis ?

BETTER CHOICE PUBLICATION-SURFACE CHEMISTRY -Question Bank
  1. How does adsorption of gases on solids depend upon: Temperature?

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  2. Explain two applications of adsorption.

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  3. Define Catalyst and Catalysis.

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

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  5. Give the mechanism of heterogeneous catalysed reaction.

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  6. Give four examples of heterogeneous catalysis.

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

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

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

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

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

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

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  13. Explain briefly homogeneous catalysis.

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

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  15. What is shape selective catalysis?

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  16. Describe some features of catalysis by zeolites.

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  17. How do enzymes differ from catalysts ?

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

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  19. Give the mechanism of heterogeneous catalysed reaction.

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  20. Explain two applications of enzymes.

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