Adsorption and Colloids
Maharashtra Board · Class 11 · Chemistry
Flashcards for Adsorption and Colloids — Maharashtra Board Class 11 Chemistry. Quick Q&A cards covering key concepts, definitions, and formulas.
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What is adsorption? How does it differ from absorption?
Answer
Adsorption is a surface phenomenon where molecules of a gas or liquid accumulate on the surface of a solid or liquid due to unbalanced forces at the surface. Key differences: - Adsorption: Surface ph…
Define adsorbent and adsorbate with examples.
Answer
Adsorbent: The material on whose surface adsorption takes place Adsorbate: The substance that gets adsorbed on the adsorbent surface Examples: - Activated charcoal (adsorbent) adsorbing methylene blu…
Compare physisorption and chemisorption in terms of forces involved and heat of adsorption.
Answer
Physisorption: - Forces: Weak van der Waals forces - Heat of adsorption: Low (20-40 kJ/mol) - Similar to heat of condensation - Reversible process Chemisorption: - Forces: Chemical bonds (covalent/io…
List five factors affecting adsorption of gases on solids and explain one in detail.
Answer
Five factors: 1. Nature of adsorbate (gas) 2. Nature of adsorbent 3. Surface area of adsorbent 4. Temperature 5. Pressure of gas Detailed explanation - Nature of adsorbate: Gases with high critical t…
State and explain the Freundlich adsorption isotherm equation.
Answer
Freundlich Equation: x/m = kP^(1/n) Where: - x = mass of gas adsorbed - m = mass of adsorbent - P = equilibrium pressure - k, n = constants (depend on nature of adsorbate, adsorbent, temperature) Lo…
What is catalysis? Distinguish between homogeneous and heterogeneous catalysis with examples.
Answer
Catalysis: Process where a substance (catalyst) increases reaction rate without undergoing permanent chemical change. Homogeneous Catalysis: - Reactants and catalyst in same phase - Examples: • H⁺…
Explain the adsorption theory of heterogeneous catalysis with five steps.
Answer
Five steps of heterogeneous catalysis: 1. Diffusion: Reactants move toward catalyst surface 2. Adsorption: Reactant molecules adsorb on catalyst surface 3. Intermediate formation: Chemical reaction o…
What are zeolites? How do they show shape selective catalysis?
Answer
Zeolites: Aluminosilicates with 3D network structure where some Si atoms are replaced by Al atoms, creating microporous structure. Shape Selective Catalysis: - Reactions depend on size and shape of r…
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