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Question 890002
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Surface Chemistry: Types of adsorption MCQ

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Types of adsorptionEasyQuestion 890002

Question

Chemisorption involves:
  1. A
    Formation of chemical bonds (strong, irreversible, specific)
    Correct
  2. B
    van der Waals forces only
  3. C
    Multi-layer formation
  4. D
    Low activation energy

Correct answer

Formation of chemical bonds (strong, irreversible, specific)

Explanation

Physisorption: weak van der Waals forces, reversible, multi-layer, low ΔH (~20-40 kJ/mol), occurs at low T. Chemisorption: chemical bonds formed, stronger (ΔH ~80-240 kJ/mol), mono-layer, specific, higher activation energy, increases then decreases with T.

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