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JEE Advanced > Surface Chemistry

Explore popular questions from Surface Chemistry for JEE Advanced. This collection covers Surface Chemistry previous year JEE Advanced questions hand picked by experienced teachers.

Q 1.

Correct4

Incorrect-1

Adsorption of gases on solids is accompanied with

A

increase in enthalpy

B

increase in entropy

decrease in entropy

D

increase in free energy

Explanation

Q 2.

Correct4

Incorrect-1

Which of the following statements is correct for lyophilic sols?

A

The coagulation of the sols is irreversible in nature

B

They are formed by inorganic substances

They are self stabilised

D

They are readily coagulated by addition of electrolytes.

Explanation

Q 3.

Correct4

Incorrect-1

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

{tex} \mathrm { CH } _ { 3 } \left( \mathrm { CH } _ { 2 } \right) _ { 15 } \mathrm { N } ^ { + } \left( \mathrm { CH } _ { 3 } \right) _ { 3 } \mathrm { Br } ^ { - } {/tex}

B

{tex} \mathrm { CH } _ { 3 } \left( \mathrm { CH } _ { 2 } \right) _ { 11 } \mathrm { OSO } _ { 3 }^- \mathrm { Na } ^ { + } {/tex}

C

{tex} \mathrm { CH } _ { 3 } \left( \mathrm { CH } _ { 2 } \right) _ { 6 } \mathrm { COO }^- \mathrm { Na } ^ { + } {/tex}

D

{tex} \mathrm { CH } _ { 3 } \left( \mathrm { CH } _ { 2 } \right) _ { 11 } \mathrm { N } ^ { + } \left( \mathrm { CH } _ { 3 } \right) _ { 3 } \mathrm { Br } ^ { - } {/tex}

Explanation

Q 4.

Correct4

Incorrect-1

Among the electrolytes {tex} \mathrm { Na } _ { 2 } \mathrm { SO } _ { 4 } , \mathrm { CaCl } _ { 2 } , \mathrm { Al } _ { 2 } \left( \mathrm { SO } _ { 4 } \right) _ { 3 } {/tex} and {tex} \mathrm { NH } _ { 4 } \mathrm { Cl } {/tex}, the most effective coagulating agent for {tex} \mathrm { Sb } _ { 2 } \mathrm { S } _ { 3 } {/tex} sol is

A

{tex} \mathrm { Na } _ { 2 } \mathrm { SO } _ { 4 } {/tex}

B

{tex} \mathrm { CaCl } _ { 2 } {/tex}

{tex} \mathrm { Al } _ { 2 } \left( \mathrm { SO } _ { 4 } \right) _ { 3 } {/tex}

D

{tex} \mathrm { NH } _ { 4 } \mathrm { Cl } {/tex}

Explanation

Q 5.

Correct4

Incorrect-1

Methylene blue, from its aqueous solution, is adsorbed on activated charcoal at {tex} 25 ^ { \circ } \mathrm { C } . {/tex} For this process, the correct statement is

A

The adsorption requires activation at {tex} 25 ^ { \circ } \mathrm { C } {/tex}

The adsorption is accompanied by a decrease in enthalpy

C

The adsorption increases with increase of temperature

D

The adsorption is irreversible.

Explanation