When adsorption hysteresis is observed, the desorption equilibrium pressure is __________ that obtained by adsorption. (A) Always lower than (B) Always higher than (C) Same as (D) Dependent on the system; can be either lower or higher than

When adsorption hysteresis is observed, the desorption equilibrium
pressure is __________ that obtained by adsorption.
(A) Always lower than
(B) Always higher than
(C) Same as
(D) Dependent on the system; can be either lower or higher than
by

1 Answer

Answer :

(A) Always lower than
by

Related questions

Though, theoretically the adsorption & desorption isotherms is expected to coincide but sometimes at least a part of the isotherms does not coincide and this phenomenon is known as adsorption hysteresis. In such cases, the desorption equilibrium pressure is __________ that obtained for adsorption. (A) Lower than (B) Higher than (C) Same as (D) Either same or higher than

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Last Answer : (A) Lower than

Which of the following is not a chemical step in a fluid solid catalytic reaction? (A) Surface chemical reaction (B) Adsorption (C) Desorption (D) None of these

Description : Which of the following is not a chemical step in a fluid solid catalytic reaction? (A) Surface chemical reaction (B) Adsorption (C) Desorption (D) None of these

Last Answer : (D) None of these

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Last Answer : (D) The equilibrium moisture content of the solid can be reduced by increasing the absolute humidity

There is desorption of physical adsorption when

Description : There is desorption of physical adsorption when

Last Answer : There is desorption of physical adsorption when A. temperature is increased B. temperature is ... pressure is increased D. concentration is increased

Gross heating value of coal is __________ the net heating value. (A) Higher than (B) Lower than (C) Same as (D) Either (A) or (B); depends on the type of coal

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For a heterogeneous catalytic reaction, A + B → C, with equimole feed of A and B, the initial rate - rA0 is invariant with total pressure. The rate controlling step is (A) Surface Kc /(1 + TS ) reaction between absorbed A and B in the gas phase (B) Surface reaction between absorbed A and absorbed B (C) Surface reaction between A in the gas phase and absorbed B(D) Desorption of C

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Bound moisture is that liquid which exerts an equilibrium vapor pressure __________ that of the pure liquid at the given temperature. (A) Less than (B) More than (C) Equal to (D) Either (A) or (B); depends on the solid

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Last Answer : (A) Less than

In case of an unsaturated mixture of gas and vapor, the percentage saturation is __________ its relative saturation. (A) Lower than (B) Higher than (C) Equal to (D) Either (A) or (B), depends on the mixture composition

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Brunauer, Emmet and Teller (BET) equation is used to determine the specific surface area of a porous particle but not the pore volume & the porosity of the catalyst bed. Which of the following postulates is not used to derive BET equation? (A) Langmuir's assumption applies to every adsorbed layer (B) There is no dynamic equilibrium between successive layer (C) The adsorbed layer may be polymolecular in thickness and the heat of adsorption in each layer (except the first one) is involved in each of the evaporation process (D) None of these

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In case of an absorber, the operating (A) Line always lies above the equilibrium curve (B) Line always lies below the equilibrium curve (C) Line can be either above or below the equilibrium curve (D) Velocity is more than the loading velocity

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The process employing desorption of the absorbed solute by a solvent is called (A) Elution (B) Osmosis (C) Reverse osmosis (D) Sublimation

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Defination of Desorption

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