Surface Chemistry
Short Answer Type
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Which sol is more stable-lyophilic or lyophobic?
Answer:
Lyophilic
: Lyophilic sols are relatively stable as strong forces of interaction exist between colloidal particles and liquid.
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What is meant by ‘Shape selective’ catalysis?
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Write down the heterogeneous catalyst involved in the polymerisation of ethylene.
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Define the enthalpy of adsorption.
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Why does chemisorption have more heat of adsorption than physico-adsorption?
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What is the range for the enthalpy of adsorption for physisorption and chemisorption?
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Lyophilic sols are reversible whereas lyophobic sols are irreversible. Why?
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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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Of NH
3
and N
2
which gas will be absorbed more readily on the surface of charcoal and why?
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How does chemical adsorption of a gas on a solid vary with temperature?
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