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1. Heat of adsorption is greater for chemisorption than physisorption. Why? 

2. What is colloldion? 

3. Differentiate between peptization and coagulation.

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1. Due to the formation of chemical bond between adsorbate and adsorbent.

2. 4% solution of nitro cellulose in a mixture of alcohol and ether. 

3. Peptisation is the process of converting a precipitate into colloidal sol by adding an electrolyte. Rut coagulation is the settling of colloidal particles

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