Surface Chemistry Flashcards
What are the bonds used in Physiosorption and Chemisorption respectively?
Van Der Wall bonds are used in Physiosorption and Strong Chemical Bonds are used in Chemisorption
What is adsorption Isobar?
Adsorption Isobar is a plot of extent of adsorption(x/m) Vs Temperature at constant pressure
What is adsorption Isotherm?
Adsorption Isotherm is the plot of extent of adsorption(x/m) vs Pressure at constant temperature. ‘x’ is quantity of gas absorbed by m unit mass of solid
What is the formulaic representation of Freundlich Adsorption Theorem?
Freundlich Adsorption Theorem is given by:
log x/m = log k + 1/n log P
Why is adsoption always exothermic?
Adsorption is always exothermic because in Adsoption there is development of inter particle attractions between adsorbate and adsorbent
Out of NH3 and CO2, which gas will get absorbed more easily on the surface of activated charcoal and why?
NH3 will be absorbed more easily on the surface of charcoal because it has higher critical temperature due to Van Der Waal force of attraction
Distinguish between Freundlich Adsorption Theorem and Langmuir Adsoption Theorem
Freundlich Adsorption Theorem fails at high pressure of gas whereas Langmuir adsorption isotherm does not as its based on kinetic theory of gas and involves two processes ie adsoption and desorption
Say something about Zeolites
Zeolites are the shape selective catalysts having honey comb structure. Zeolite Catalyst ZSM-5 is used in petroleum industry to convert alcohols into gasoline by dehydration
What does Sucrose give in presence of Invertase?
Sucrose→→Invertase→→ Glucose + Fructose(Inversion of Cane Sugar)
What does Maltose give in presence of Maltase?
Maltose→→Maltase→→ Glucose + Glucose( Yeah its correct )
What does Lactose give in presence of Lactase?
Lactose→→Lactase→→Glucose + Galactose
What does Glucose give in presence of Zymase?
Glucose→→Zymase→→Ethyl Alcohol + CO2
What does Protein give in presence of Pepsin?
Protein→→Pepsin→→Peptides
What does Milk give in presence of lactobacilli enzyme?
Milk→→Lactobacilli Enzyme→→Curd
What are emulsions ?
Emulsions are liquid-liquid colloidal systems. Eg- Milk, Cream
