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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 NH
3
and N
2
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?
Answer:
Chemisorption involves strong forces of attraction along with exchange of electrons at free valencies.
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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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