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Surface Chemistry

Short Answer Type

61. How does chemical adsorption of a gas on a solid vary with temperature?

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62. What is meant by ‘Shape selective’ catalysis?

Answer:

The catalytic reaction that depends upon the structure of pores of the catalyst and the size of the reactant and product molecules is called shape/selective catalysis. Zeolites are good shape/selective catalysts because of their honeycomb-like structures.

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63. Define the enthalpy of adsorption.

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64. Write down the heterogeneous catalyst involved in the polymerisation of ethylene.

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65. Of NH₃ and N₂ which gas will be absorbed more readily on the surface of charcoal and why?

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66. What is the range for the enthalpy of adsorption for physisorption and chemisorption?

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67. Lyophilic sols are reversible whereas lyophobic sols are irreversible. Why?

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68. Why does chemisorption have more heat of adsorption than physico-adsorption?

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69. Colloidal solution can be had in a water and in air as media. What distinctive names are given to these two types of sols?

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70.

Which sol is more stable-lyophilic or lyophobic?

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