Question

The Langmuir adsorption isotherm is deduced by using the assumption that

A. the adsorption takes place in multilayers
B. the adsorption sites are equivalent in their ability to adsorb the particles  
C. the heat of adsorption varies with coverage
D. the adsorbed molecules interact with each other
Answer :   the adsorption sites are equivalent in their ability to adsorb the particles
Solution :
The main points of Langmuir's theory of adsorption are as
(i) Adsorption takes place on the surface of the solid only till the whole of the surface is completely covered with a unimolecular layer of the adsorbed gas.
(ii) Adsorption consist of two opposing processes (a) condensation and (b) evaporation.
(iii) The rate of condensation depend upon the uncovered surface of the adsorbent available for condensation.

Releted MCQ Question on
Physical Chemistry >> Surface Chemistry

Releted Question 1

Rate of physiorption increases with

A. decrease in temperature
B. increase in temperature
C. decrease in pressure
D. decrease in surface area
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Releted Question 2

Adsorption of gases on solid surface is generally exothermic because

A. enthalpy is positive
B. entropy decreases
C. entropy increases
D. free energy increases
View Answer
Releted Question 3

Lyophilic sols are

A. Irreversible sols
B. They are prepared from inorganic compound
C. Coagulated by adding electrolytes
D. Self-stabilizing
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Releted Question 4

Among the following, the surfactant that will form micelles in aqueous solution at the lowest molar concentration at ambient condition is : -

A. $$C{H_3}{\left( {C{H_2}} \right)_{15}}{N^ + }{\left( {C{H_3}} \right)_3}B{r^ - }$$
B. $$C{H_3}{\left( {C{H_2}} \right)_{11}}OSO_3^ - N{a^ + }$$
C. $$C{H_3}{\left( {C{H_2}} \right)_6}CO{O^ - }N{a^ + }$$
D. $$C{H_3}{\left( {C{H_2}} \right)_{11}}{N^ + }{\left( {C{H_3}} \right)_3}B{r^ - }$$
View Answer

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Surface Chemistry

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