Question

Adsorption of gases on solid surface is generally exothermic because

A. enthalpy is positive

B. entropy decreases

C. entropy increases

D. free energy increases

Answer : entropy decreases

Solution :
When a gas is adsorbed on the surface, the freedom of movement of its molecules becomes restricted. This causes decrease in the entropy of the gas after adsorbtion, i.e. $$\Delta S$$ becomes 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

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

Releted Question 3

Lyophilic sols are

A. Irreversible sols

B. They are prepared from inorganic compound

C. Coagulated by adding electrolytes

D. Self-stabilizing

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. $$C{H_3}{\left( {C{H_2}} \right)_{11}}{N^ + }{\left( {C{H_3}} \right)_3}B{r^ - }$$

Practice More Releted MCQ Question on
Surface Chemistry

Practice More MCQ Question on Chemistry Section

Physical Chemistry Some Basic Concepts in Chemistry Stoichiometry States of Matter Solid, Liquid and Gas Atomic Structure Chemical Thermodynamics Solutions Solid State Surface Chemistry Chemical Equilibrium Ionic Equilibrium Chemical Kinetics Redox Reaction Electrochemistry Nuclear Chemistry

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Organic Chemistry General Organic Chemistry Isomerism Purification and Characterisation of Organic Compounds Hydrocarbons (Alkane, Alkene and Alkyne)Aromatic hydrocarbon Electrophilic Aromatic Substitution (Haloalkanes and Haloarenes)Alkyl and Aryl Halide Reactions on Benzene Alcohol, Phenol and Ether Aldehyde and Ketone Carboxylic Acid Organic Compounds Containing Nitrogen Name Reactions Polymers Biomolecules Chemistry in Everyday Life Practical Organic Chemistry