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Write three distinct differences between physical adsorption and chemisorption.

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Physical adsorption 

1. Forces of attraction between the adsorbent and adsorbate molecules are weak Van der Waals’ forces,

2. Heat of adsorption is low (20-40 kJ mol1

3. It is temporary and reversible.

Chemical adsorption 

1. Forces between the adsorbent and the adsorbate are strong chemical bond. 

2. Heat of adsorption is high (80-24OkJ mol1

3. It is permanent and irreversible.

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