Class 12 Exam > Class 12 Questions > Directions: In the following questions, A st...
Start Learning for Free
Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): Extent of physisorption of a gas increases with decrease in temperature.
Reason (R): It is due to decrease in strength of van der Waals forces.
- a)Both A and R are true and R is the correct explanation of A
- b)Both A and R are true but R is NOT the correct explanation of A
- c)A is true but R is false
- d)A is false and R is True
Correct answer is option 'C'. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Verified Answer
Directions: In the following questions, A statement of Assertion (A) ...
In physisorption, phenomenon particles are held to the surface by weak van der Waals’ force of attraction which get destroyed due to increase in temperature.
View all questions of this test
Most Upvoted Answer
Directions: In the following questions, A statement of Assertion (A) ...
Assertion (A): Extent of physisorption of a gas increases with decrease in temperature.
Reason (R): It is due to decrease in strength of van der Waals forces.
The correct answer is option 'C', i.e., A is true but R is false.
Explanation:
Physisorption is a type of adsorption in which the adsorbate molecules are held to the surface of the adsorbent by weak van der Waals forces. These forces arise due to temporary dipoles induced in the molecules. The extent of physisorption is influenced by several factors, including temperature.
When the temperature decreases, the kinetic energy of the gas molecules decreases. As a result, the gas molecules move slower and have less energy to overcome the attractive forces between the adsorbate and the adsorbent. This leads to an increase in the extent of physisorption.
However, the reason given for the assertion is incorrect. The strength of van der Waals forces does not decrease with a decrease in temperature. In fact, the strength of van der Waals forces remains constant with temperature. These forces are purely intermolecular forces and are not affected by temperature changes.
The increase in the extent of physisorption with a decrease in temperature can be explained by the decrease in the kinetic energy of the gas molecules, which makes it easier for them to be trapped by the weak van der Waals forces. Therefore, the assertion is true.
On the other hand, the reason provided is false as it incorrectly states that the decrease in temperature leads to a decrease in the strength of van der Waals forces. Van der Waals forces are not influenced by temperature.
Hence, the correct choice is option 'C' - A is true but R is false.
Reason (R): It is due to decrease in strength of van der Waals forces.
The correct answer is option 'C', i.e., A is true but R is false.
Explanation:
Physisorption is a type of adsorption in which the adsorbate molecules are held to the surface of the adsorbent by weak van der Waals forces. These forces arise due to temporary dipoles induced in the molecules. The extent of physisorption is influenced by several factors, including temperature.
When the temperature decreases, the kinetic energy of the gas molecules decreases. As a result, the gas molecules move slower and have less energy to overcome the attractive forces between the adsorbate and the adsorbent. This leads to an increase in the extent of physisorption.
However, the reason given for the assertion is incorrect. The strength of van der Waals forces does not decrease with a decrease in temperature. In fact, the strength of van der Waals forces remains constant with temperature. These forces are purely intermolecular forces and are not affected by temperature changes.
The increase in the extent of physisorption with a decrease in temperature can be explained by the decrease in the kinetic energy of the gas molecules, which makes it easier for them to be trapped by the weak van der Waals forces. Therefore, the assertion is true.
On the other hand, the reason provided is false as it incorrectly states that the decrease in temperature leads to a decrease in the strength of van der Waals forces. Van der Waals forces are not influenced by temperature.
Hence, the correct choice is option 'C' - A is true but R is false.
|
Explore Courses for Class 12 exam
|
|
Similar Class 12 Doubts
Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Extent of physisorption of a gas increases with decrease in temperature.Reason (R): It is due to decrease in strength of van der Waals forces.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is TrueCorrect answer is option 'C'. Can you explain this answer?
Question Description
Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Extent of physisorption of a gas increases with decrease in temperature.Reason (R): It is due to decrease in strength of van der Waals forces.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is TrueCorrect answer is option 'C'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Extent of physisorption of a gas increases with decrease in temperature.Reason (R): It is due to decrease in strength of van der Waals forces.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is TrueCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Extent of physisorption of a gas increases with decrease in temperature.Reason (R): It is due to decrease in strength of van der Waals forces.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is TrueCorrect answer is option 'C'. Can you explain this answer?.
Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Extent of physisorption of a gas increases with decrease in temperature.Reason (R): It is due to decrease in strength of van der Waals forces.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is TrueCorrect answer is option 'C'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Extent of physisorption of a gas increases with decrease in temperature.Reason (R): It is due to decrease in strength of van der Waals forces.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is TrueCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Extent of physisorption of a gas increases with decrease in temperature.Reason (R): It is due to decrease in strength of van der Waals forces.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is TrueCorrect answer is option 'C'. Can you explain this answer?.
Solutions for Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Extent of physisorption of a gas increases with decrease in temperature.Reason (R): It is due to decrease in strength of van der Waals forces.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is TrueCorrect answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 12.
Download more important topics, notes, lectures and mock test series for Class 12 Exam by signing up for free.
Here you can find the meaning of Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Extent of physisorption of a gas increases with decrease in temperature.Reason (R): It is due to decrease in strength of van der Waals forces.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is TrueCorrect answer is option 'C'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Extent of physisorption of a gas increases with decrease in temperature.Reason (R): It is due to decrease in strength of van der Waals forces.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is TrueCorrect answer is option 'C'. Can you explain this answer?, a detailed solution for Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Extent of physisorption of a gas increases with decrease in temperature.Reason (R): It is due to decrease in strength of van der Waals forces.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is TrueCorrect answer is option 'C'. Can you explain this answer? has been provided alongside types of Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Extent of physisorption of a gas increases with decrease in temperature.Reason (R): It is due to decrease in strength of van der Waals forces.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is TrueCorrect answer is option 'C'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Extent of physisorption of a gas increases with decrease in temperature.Reason (R): It is due to decrease in strength of van der Waals forces.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is TrueCorrect answer is option 'C'. Can you explain this answer? tests, examples and also practice Class 12 tests.
|
|
Explore Courses for Class 12 exam
|
|
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
Follow Us
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup