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Test: Adsorption, Adsorption isotherms - JEE MCQ


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20 Questions MCQ Test Chemistry for JEE Main & Advanced - Test: Adsorption, Adsorption isotherms

Test: Adsorption, Adsorption isotherms for JEE 2024 is part of Chemistry for JEE Main & Advanced preparation. The Test: Adsorption, Adsorption isotherms questions and answers have been prepared according to the JEE exam syllabus.The Test: Adsorption, Adsorption isotherms MCQs are made for JEE 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Adsorption, Adsorption isotherms below.
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Test: Adsorption, Adsorption isotherms - Question 1

The volume of gases and adsorbed by one gram of charcoal at are in order of:

Detailed Solution for Test: Adsorption, Adsorption isotherms - Question 1

Van der Waal force ↑ adsorption ↑

Test: Adsorption, Adsorption isotherms - Question 2

The heat evolved in chemisorption lies in the range (in kJ/mol) of:

Detailed Solution for Test: Adsorption, Adsorption isotherms - Question 2

to

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Test: Adsorption, Adsorption isotherms - Question 3

gram of oxygen is adsorbed on of metal powder. What volume of oxygen adsorbed per gram of the adsorbent at and ?

Detailed Solution for Test: Adsorption, Adsorption isotherms - Question 3
Mass of per gram of adsorbent
No. of moles of per gram of
adsorbent
Volume of per gram of adsorbent
Test: Adsorption, Adsorption isotherms - Question 4
of acetic acid is shaken with activated carbon. The final concentration of the solution after adsorption is . What is the amount of acetic acid adsorbed per gram of carbon?
Detailed Solution for Test: Adsorption, Adsorption isotherms - Question 4
Mass of acetic acid adsorbed by charcoal
Test: Adsorption, Adsorption isotherms - Question 5
Although, nitrogen does not adsorb on a surface at room temperature, it adsorbs on the surface at . Which one of the following statements is correct?
Detailed Solution for Test: Adsorption, Adsorption isotherms - Question 5
At physical absorption takes place effectively so multimolecular layers formed.
Test: Adsorption, Adsorption isotherms - Question 6
Which of the following statements is not correct?
Detailed Solution for Test: Adsorption, Adsorption isotherms - Question 6
Both physical and chemical adsorption are exothermic in nature. But, chemical absorption requires high heat of adsorption due to formation of chemical bond.
Moreover, magnitude of chemical adsorption increases and that of physical adsorption decreases with the rise in temperature due to requirement of activation energy in case of chemical adsorption. Thus, option (b) is incorrect.
Test: Adsorption, Adsorption isotherms - Question 7

Which one of the following statements is correct for adsorption of solutes on solids in solutions?

Detailed Solution for Test: Adsorption, Adsorption isotherms - Question 7

(a) The extent of adsorption increases with an increase in temperature is an incorrect statement because an increase in temperature reduces the interaction between the absorbate molecules and adsorbent molecules.
(b) The extent of adsorption decreases with an increase of surface area of the adsorbate is also an incorrect statement as adsorption surface area of adsorbate.
(c) The extent of adsorption decreases with an increased in temperature.

Thus, is the correct statement.
(d) The extent of adsorption does not depend on amount of solute in solution.
This is also an incorrect statement because :


where, amount of adsorbent , adsorbed on given mass of adsorbate and an integer. Thus, plot of gives a straight line upward slope.
Hence, option (c) is the correct answer.

Test: Adsorption, Adsorption isotherms - Question 8
Methylene blue, from its aqueous solution, is adsorbed on activated charcoal at . For this process, which of the following statement is correct?
Detailed Solution for Test: Adsorption, Adsorption isotherms - Question 8
The adsorption of methylene blue on activated charcoal is an example of physiosorption which is exothermic, multilayer and does not have energy barrier.
Test: Adsorption, Adsorption isotherms - Question 9
In an experiment, of oxalic acid is shaken with of activated charcoal and filtered. The concentration of the filtrate is reduced to . The amount of adsorption is
Detailed Solution for Test: Adsorption, Adsorption isotherms - Question 9
(c) The sols obtained in the two cases will be oppositely charged to coagulate each other.
Mass of oxalic acid adsorbed by charcoal

Test: Adsorption, Adsorption isotherms - Question 10
Which of the following statements regarding difference between adsorption and absorption is incorrect?
Detailed Solution for Test: Adsorption, Adsorption isotherms - Question 10
Both adsorption and absorption can take place simultaneously. The term sorption is used to describe both the processes.
Test: Adsorption, Adsorption isotherms - Question 11
Which gas will be adsorbed on a solid to greater extent?
Detailed Solution for Test: Adsorption, Adsorption isotherms - Question 11
The phenomenon of adsorption of gases by solids depends upon the following: Nature of adsorbent and adsorbate : The amount of the gas adsorbed depends upon the nature of the adsorbent and the gas (adsorbate) which is to be adsorbed. Gases like and , which liquefy more easily are adsorbed more readily than the permanent gases like and which do not liquefy easily.
This is because the easily liquefiable gases have greater van der waal's or the molecular forces of attraction or cohesive forces. As the critical temperatures of the easily liquefiable gases are more than the permanent gases, it follows that higher the critical temperature of the gas (adsorbate), the greater the extent of adsorption.
Test: Adsorption, Adsorption isotherms - Question 12

Which of the following statements is correct for the spontaneous adsorption of a gas?

Detailed Solution for Test: Adsorption, Adsorption isotherms - Question 12

For adsorption and for a spontaneous change hence should be highly negative which is clear from the equation

So if is highly negative will also be

Test: Adsorption, Adsorption isotherms - Question 13

For adsorption, the thermodynamic requirement is that

Detailed Solution for Test: Adsorption, Adsorption isotherms - Question 13

On the basis of equation, ΔG=ΔH−TΔS can be negative if ΔH has sufficiently high negative value as −TΔS is positive. Thus, in adsorption which is a spontaneous process.
ΔS is negative, ΔH is sufficiently negative and as a result ΔG is also negative

Test: Adsorption, Adsorption isotherms - Question 14
Adsorption is always
Detailed Solution for Test: Adsorption, Adsorption isotherms - Question 14
Adsorption is an exothermic process.
Test: Adsorption, Adsorption isotherms - Question 15

Rate of physisorption increases with

Detailed Solution for Test: Adsorption, Adsorption isotherms - Question 15

The physical adsorption (ie, physisorption) is an exothermic process, so on the basis of Le-Chatelier principle increasing of temperature is favourable towards a direction in which heat is absorbed, so the rate of physisorption increases with decrease of temperature.

Test: Adsorption, Adsorption isotherms - Question 16
For the graph below, select correct order of temperature?
Detailed Solution for Test: Adsorption, Adsorption isotherms - Question 16
Temp Extent of adsorption
Test: Adsorption, Adsorption isotherms - Question 17
Which one of the following equations represents Freundlich adsorption isotherm?
Detailed Solution for Test: Adsorption, Adsorption isotherms - Question 17
Freundlich adsorption isotherm reaction is
Test: Adsorption, Adsorption isotherms - Question 18
At the high pressure, Langmuir adsorption isotherm takes the form
Detailed Solution for Test: Adsorption, Adsorption isotherms - Question 18
Langmuir adsorption isotherm, is

At high pressure,
or
Test: Adsorption, Adsorption isotherms - Question 19
According to Langmuir adsorption isotherm, the amount of gas adsorbed at very high pressures
Detailed Solution for Test: Adsorption, Adsorption isotherms - Question 19
According to Langmuir adsorption isotherm, the amount of gas adsorbed at very high pressure reaches a constant limiting volume.
Test: Adsorption, Adsorption isotherms - Question 20
The plot of (y-axis) and -axis) is a straight line inclined at an angle of . When the intercept, is 10 and pressure is the amount of solute in grams adsorbed per gram of adsorbent
Detailed Solution for Test: Adsorption, Adsorption isotherms - Question 20
According to Freundlich adsorption isotherm:-

We have,


Thus,
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