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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?

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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?

Answer:

ΔH_adsor for physisorption is in the range of 20-40 kJ/mol .
This is because the attraction between gas molecules and solid surface is only due to weak van der Waals’ forces.

chemisorption it is 40-400 kJ/mol.
Enthalpy of chemisorption is highn as it involves chemical bond formation

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