Description : The given graph/data I, II, III and IV represent general trends observed for different physisorption and chemisorption processes under mild conditions
Last Answer : The given graph/data I, II, III and IV represent general trends observed for different ... D. IV is chemisorption and III is chemisorption
Description : Rate of physisorption increases with :
Last Answer : Rate of physisorption increases with : A. decrease in temperature B. increases in temperature C. decrease in pressure D. decrease in surface area
Description : Which of the following statements are true for physisorption ?
Last Answer : Which of the following statements are true for physisorption ? A. Extent of adsorption increases with ... easily D. It occurs at high temperature.
Description : Why does physisorption decrease with increase of temperature ?
Last Answer : Ans.: Because the attraction between gas molecules and solid surface is very weak which easily over come by increase of temperature.
Description : Which of the following is not a characteristic of chemisorption?
Last Answer : Which of the following is not a characteristic of chemisorption? A. It is irreversible B. It is ... of adsorption is generally around 80 - 240 kJ
Description : The rate of chemisorption :
Last Answer : The rate of chemisorption : A. decreases with increase of pressure B. increases with increase ... of pressure D. is independent of temperature
Description : Which of the following statements about chemisorption is not applicable?
Last Answer : Which of the following statements about chemisorption is not applicable? A. It involves chemical forces ... D. It does not require activation energy
Description : Chemisorption (chemical adsorption) is (A) Same as "Van der Waals" adsorption (B) Characterised by adsorption of heat (C) An irreversible phenomenon (D) A reversible phenomenon
Last Answer : (C) An irreversible phenomenon
Description : Pick out the wrong statement. (A) With decrease in feed temperature, the number of plates required for binary distillation decreases for a given L/V' ratio (B) The extraction per unit ... and its crosssection is wider at the bottom (D) Vander wall adsorption is also called chemisorption
Last Answer : (D) Vander wall adsorption is also called chemisorption
Description : Why physical adsorption is multimolecular whereas chemisorption is unimolecular ?
Last Answer : Chemisorption takes place as a result of reaction between adsorbent and adsorbate. When the surface of the adsorbent is covered with one layer, no further reaction can take place. Physical adsorption is ... any number of layers may be formed one over the other on the surface of the adsorbent.
Description : Pick out the wrong statement. (A) Exit age description function (E) and internal age distribution function (I) are related as, E = -(dI/dθ) (B) Chemisorption studies are useful in the ... energy (D) A catalyst increases the potential energy barrier over which the reactants must pass to form products
Last Answer : (D) A catalyst increases the potential energy barrier over which the reactants must pass to form products
Description : 10. In Freundlich Adsorption isotherm, the value of 1/n is: (1) 1 in case of chemisorption (2) between 0 and 1 in all cases (3) between 2 and 4 in all cases (4) 1 in case of physical adsorption
Last Answer : between 0 and 1 in all cases