Flashcards for NEET Chemistry are designed to boost your NEET preparation. Find below flashcards for the chapter “Surface Chemistry”. These flashcards are prepared as per the NEET syllabus. These are helpful for aspirants of NEET and other exams, during last-minute revision. It covers all the important points that are frequently asked in the exam. Check BYJU’S for the full set of Flashcards and Study material for NEET Chemistry.
Download PDF of NEET Chemistry Flashcards for Surface Chemistry
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Name of the NEET Sub-section |
Topic |
Flashcards Helpful for |
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Chemistry |
Surface Chemistry |
NEET Exams |
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Surface Chemistry |
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Adsorption |
It is the process of accumulation of molecular species (adsorbate) at the surface (adsorbent) rather than in the bulk of a solid or liquid E.g. water molecules get adsorbed on the surface of the silica gel |
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Desorption |
It is the process of removing an adsorbed substance from the surface |
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Sorption |
It is referred to the condition where both adsorption and absorption take place simultaneously |
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Physisorption |
Molecules are held by weak van der Waals’ forces It lacks specificity It is generally reversible Forms multimolecular layers Enthalpy of adsorption is quite low (20-40 kJ mol–1) |
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Chemisorption |
Molecules are held by chemical bonds (covalent or ionic) It is highly specific Generally irreversible in nature Forms unimolecular layer Enthalpy of adsorption is high (80-240 kJ mol–1) |
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Freundlich Adsorption Isotherm |
It tells about the variation in the quantity of gas adsorbed by adsorbent with pressure at a constant temperature log x/m = log k + 1/n (log p) The plot of x/m vs pressure |
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Promoters |
Substances that enhance the activity of a catalyst E.g. Mo acts as a promoter for Fe which is used as a catalyst in Haber’s process |
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Poisons |
Substances that decrease the activity of a catalyst E.g. Lindlar’s catalysts are poisoned by lead acetate, Ziegler-Natta catalysts are poisoned by water and oxygen |
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Shape-selective Catalysis |
In this, the catalytic reaction depends upon the pore structure of the catalyst and the size of the reactant and product molecules E.g. Zeolites (aluminosilicates) with a honey-comb like structures |
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Sols |
Solids in liquids Dispersed phase – solids Dispersion medium – liquids E.g. paints |
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Gels |
Liquids in solids Dispersed phase – liquids Dispersion medium – solids E.g. Cheese |
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Emulsions |
Liquids in liquids Dispersed phase – liquids Dispersion medium – liquids Oil in water type emulsions e.g., milk Water in oil type emulsions e.g., butter |
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Lyophilic Colloids |
Liquid-loving colloids Reversible sols Quite stable and cannot coagulate easily |
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Lyophobic Colloids |
Liquid-hating colloids Irreversible sols Not stable and readily coagulate. Require stabilising agents for preservation |
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Micelles |
Associated colloids Form aggregates at higher concentrations and show colloidal behaviour Kraft temperature (Tk) – the temperature above which the formation of micelles takes place Critical micelle concentration (CMC) – the concentration above which the formation of micelles takes place |
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