Question

$\huge\bigstar{\large\underline\bold\red{QUESTION}}\huge\bigstar$
Difference between Physisorption and chemisorption
What is the change in enthalpy(△H),entropy(△S), Gibb's free energy(△G) for adsorption

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Answer 1

Answer:

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Answer 2

Physisorption (Physical adsorption)

• Weak van der Waals forces are present between the adsorbate molecules and the adsorbent.
• The enthalpy of adsorption is low (20 to 40 kJ/mol). Occurs at low temperature and decreases with an increase in temperature. It is reversible. No significant activation energy is required.
• It forms multimolecular layers.

Chemisorption (Chemical adsorption)

• Strong chemical forces similar to chemical bonds are present between the adsorbate molecules and the adsorbent.
• The enthalpy of adsorption is high (40 to 400 kJ/mol). Occurs at high temperature and increases with increase in temperature. It is irreversible. activation energy is Usually, high required.
• It forms unimolecular layers.