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Surface Chemistry Class 12 Notes Chemistry

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FAQs on Surface Chemistry Class 12 Notes Chemistry

1. What is surface chemistry?
Ans. Surface chemistry is the branch of chemistry that deals with the study of chemical reactions that occur at the interfaces of materials, particularly on the surface of solids, liquids, and gases. It focuses on understanding the behavior of molecules and reactions occurring at the surface or interface.
2. What are the factors that influence surface chemistry?
Ans. Several factors influence surface chemistry, including temperature, pressure, concentration, nature of the substances involved, surface area, and the presence of catalysts. These factors can affect the adsorption, desorption, and reaction rates at the surface.
3. What is adsorption and how does it occur in surface chemistry?
Ans. Adsorption is a process in which molecules or ions from a gas or liquid phase adhere to the surface of a solid or liquid phase. It occurs due to the attractive forces between the adsorbate and the surface. Adsorption plays a crucial role in surface chemistry as it influences various phenomena such as catalysis, corrosion, and separation processes.
4. What is the difference between physical adsorption and chemical adsorption?
Ans. Physical adsorption, also known as physisorption, involves weak van der Waals forces between the adsorbate and the surface. It usually occurs at low temperatures and can be easily reversed. On the other hand, chemical adsorption, also known as chemisorption, involves strong chemical bonds between the adsorbate and the surface. It occurs at higher temperatures and is more difficult to reverse.
5. How does surface chemistry contribute to catalysis?
Ans. Surface chemistry plays a crucial role in catalysis by providing a large surface area for reactant molecules to come into contact with each other. It facilitates the adsorption of reactant molecules onto the catalyst surface, leading to increased reaction rates. The properties of the catalyst surface, such as its composition and structure, also influence the catalytic activity.
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