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प्रश्न
Which statement is not correct?
पर्याय
Physical adsorption is due to van der Waals’ forces.
Physical adsorption decreases at high temperature and low pressure.
Physical adsorption is reversible.
Adsorption energy for a chemical adsorption is generally lesser than that of physical adsorption.
MCQ
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उत्तर
Adsorption energy for a chemical adsorption is generally lesser than that of physical adsorption.
Explanation:
Chemical adsorption (chemisorption) involves stronger valence bond forces and thus has a higher adsorption energy (80-240 kJ/mol), whereas physical adsorption (physisorption) involves weaker van der Waals’ forces with lower adsorption energy (20-40 kJ/mol). Hence, chemical adsorption energy is generally greater, not lesser than physical adsorption energy.
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