Question

Which of the following statements is incorrect regarding physissorptions?

A. More easily liquefiable gases are adsorbed readily.
B. Under high pressure it results into multi molecular layer on adsorbent surface.
C. Enthalpy of adsorption $$\left( {\Delta {H_{adsorption}}} \right)$$   is low and positive.  
D. It occurs because of van der Waal’s forces.
Answer :   Enthalpy of adsorption $$\left( {\Delta {H_{adsorption}}} \right)$$   is low and positive.
Solution :
Adsorption is an exothermic process, hence  $${\Delta H}$$  will always be negative

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
View Answer
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
View Answer
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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