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

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

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Define the enthalpy of adsorption.

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

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What is meant by ‘Shape selective’ catalysis?

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

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Which sol is more stable-lyophilic or lyophobic?

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

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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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