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Adsorption is the tendency of accumulati...

Adsorption is the tendency of accumulation of molecular species at the surface of solid or liquid. Depending upon the nature of bonds or forces of attraction between adsorbate and adsorbent. It is classofied between physisorption and chemisorption.
Which of the following characteristics is not correct for physical adsorption?

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To determine which characteristic is not correct for physical adsorption (physisorption), we can analyze each of the provided statements about physisorption. ### Step-by-Step Solution: 1. **Understanding Physisorption**: Physisorption is the process where molecules (adsorbate) adhere to the surface of a solid or liquid (adsorbent) through weak van der Waals forces. This process is generally characterized by its reversibility and spontaneity. 2. **Analyzing the Characteristics**: - **Characteristic 1**: "Adsorption is spontaneous." - **Explanation**: Physisorption is indeed spontaneous because it occurs without the need for external energy. The Gibbs free energy change (ΔG) for spontaneous processes is negative. Thus, this statement is correct. - **Characteristic 2**: "It is reversible in nature." - **Explanation**: Physisorption is reversible because the weak van der Waals forces can easily be overcome by increasing temperature or reducing pressure. Therefore, this statement is also correct. - **Characteristic 3**: "Degree of adsorption increases with temperature." - **Explanation**: This statement is incorrect. In physisorption, as temperature increases, the kinetic energy of the adsorbate molecules also increases, which can lead to a decrease in adsorption because the weak van der Waals forces become weaker at higher temperatures. Thus, this statement is not correct. 3. **Conclusion**: The characteristic that is not correct for physical adsorption is: "Degree of adsorption increases with temperature." ### Final Answer: The characteristic that is not correct for physical adsorption is: "Degree of adsorption increases with temperature."
To determine which characteristic is not correct for physical adsorption (physisorption), we can analyze each of the provided statements about physisorption. ### Step-by-Step Solution: 1. **Understanding Physisorption**: Physisorption is the process where molecules (adsorbate) adhere to the surface of a solid or liquid (adsorbent) through weak van der Waals forces. This process is generally characterized by its reversibility and spontaneity. 2. **Analyzing the Characteristics**: ...
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