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Which of the following statements about Physical Adsorption is true?
Physical adsorption occurs due to the formation of covalent bonds between the adsorbate and adsorbent.
The degree of physical adsorption decreases with an increase in temperature.
Physical adsorption is irreversible and cannot be undone.
The amount of physical adsorption is independent of the surface area of the adsorbent.
Answers (1)
Physical adsorption occurs due to the weak van der Waals forces between the adsorbate and adsorbent. These forces increase with a decrease in temperature and decrease with an increase in temperature. Therefore, the degree of physical adsorption decreases with an increase in temperature. Option A is incorrect because physical adsorption does not involve the formation of covalent bonds. Option C is incorrect because physical adsorption can be undone by reversing the conditions that led to its formation, such as decreasing the pressure or increasing the temperature. Option D is incorrect because the amount of physical adsorption depends on the surface area of the adsorbent.
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