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Surface Chemistry — Chemistry STD 12 — Question

Tamilnadu BoardEnglish MediumSTD 12ChemistrySurface Chemistry3 Marks
Question
Write three distinct differences between physical adsorption and chemisorption.
✓

Answer

solution Physical adsorption
1. Forces of attraction between the adsorbent and adsorbate molecules are weak Van der Waals' forces,
2. Heat of adsorption is low ( $20-40 kJ mol ^1$ )
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 ( $80-240 KJ mol ^1$ )
3. It is permanent and irreversible.

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