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NEET Exam  >  NEET Test  >  Physical Chemistry  >  Assertion & Reason Test: Surface Chemistry (Old NCERT) - NEET MCQ

Surface Chemistry (Old NCERT) - Free Assertion & Reason Questions


MCQ Practice Test & Solutions: Assertion & Reason Test: Surface Chemistry (Old NCERT) (12 Questions)

You can prepare effectively for NEET Physical Chemistry for NEET with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Assertion & Reason Test: Surface Chemistry (Old NCERT)". These 12 questions have been designed by the experts with the latest curriculum of NEET 2026, to help you master the concept.

Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 24 minutes
  • - Number of Questions: 12

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Assertion & Reason Test: Surface Chemistry (Old NCERT) - Question 1
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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 adsorption of adsorbate from solution phase increases with increase in amount of adsorbate in solution.

Reason (R): Freundlich’s equation describes the behaviour of adsorption from a solution.

Detailed Solution: Question 1

Freundlich’s equation describes the behaviour of adsorption from a solution.

It also written as

x = mass of adsorbate

m = mass of adsorbent

p = equilibrium pressure of the gaseous adsorbate in case of experiments made in gas phase (gas/ solid interaction with gaseous species/adsorbed species).

C = equilibrium constant of adsorbate in case of experiments made with an aqueous solution in contact with dispersed solid phase (dissolved species/adsorbed species).

k and n are constants of a given adsorbate and adsorbent at a given temperature (from there, the item isotherm needed to avoid significant gas pressure fluctuations due to uncontrolled temperature variations in the case of adsorption experiments of a gas onto a solid phase).

Assertion & Reason Test: Surface Chemistry (Old NCERT) - Question 2
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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.

Detailed Solution: Question 2

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.

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Assertion & Reason Test: Surface Chemistry (Old NCERT) - Question 3
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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): At the equilibrium position in the process of adsorption ∆H = T∆S.

Reason (R): Adsorption is accompanied by decrease in surface energy.

Detailed Solution: Question 3

∆G = ∆H – T∆S Gibbs Free energy equation Adsorption is a spontaneous process so ∆G is negative. At equilibrium it becomes zero and ∆H = T∆S is attained.

Assertion & Reason Test: Surface Chemistry (Old NCERT) - Question 4
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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): Activated adsorption is also known as chemical adsorption or chemisorption.

Reason (R): It involves formation of chemical bonds between adsorbent and reactants.

Detailed Solution: Question 4

Activated adsorption is also known as chemical adsorption or chemisorption as it involves formation of chemical bonds between adsorbent and reactants.

Assertion & Reason Test: Surface Chemistry (Old NCERT) - Question 5
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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): An ordinary filter paper impregnated with collodion solution stops the flow of colloidal particles.

Reason (R): Pore size of the filter paper becomes more than the size of colloidal particle.

Detailed Solution: Question 5

Pore size of the filter paper becomes less than the size of colloidal particles hence colloidal particles do not flow through it.

Assertion & Reason Test: Surface Chemistry (Old NCERT) - Question 6
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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): Detergents with low CMC are more economical to use.

Reason (R): Cleansing action of detergents involves the formation of micelles. These are formed when the concentration of detergents becomes equal to CMC.

Detailed Solution: Question 6

Cleansing of clothes takes place by micelles and their formation starts at CMC. The lesser is the CMC, the better and more economical is the detergent.

Assertion & Reason Test: Surface Chemistry (Old NCERT) - Question 7
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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): Colloidal solutions do not show Brownian motion.

Reason (R): Brownian motion is responsible for stability of sols.

Detailed Solution: Question 7

Colloidal particles show Brownian movement and it is responsible for the stability of colloidal solution.

Assertion & Reason Test: Surface Chemistry (Old NCERT) - Question 8
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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): Coagulation power of Al3+ is more than Na+.

Reason (R): Greater the valency of the flocculating ion added, greater is its power to cause precipitation (Hardy-Schulze rule).

Detailed Solution: Question 8

According to Hardy-Schulze law, the greater is the valency of the coagulating ion, the more is the power to coagulate the colloidal solution. Thus, the coagulation power of Al3+ is greater than that of Na+.

Assertion & Reason Test: Surface Chemistry (Old NCERT) - Question 9
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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): Colloidal solutions show colligative properties.

Reason (R): Colloidal particles are large in size.

Detailed Solution: Question 9

Colloidal particles are large in size and hence the number of particles is lesser than the true solution. The lesser number of particles results in lower colligative properties.

Assertion & Reason Test: Surface Chemistry (Old NCERT) - Question 10
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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): Colloids are stable.

Reason (R): Brownian movement has a stirring effect, which does not allow the particles to settle.

Detailed Solution: Question 10

Colloids are stable due to Brownian movement which is the movement of colloidal particles striking against the dispersion medium. It prevents them from settling down.

Assertion & Reason Test: Surface Chemistry (Old NCERT) - Question 11
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Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

Assertion: Detergents with low CMC are more economical to use.

Reason: Cleansing action of detergents involves the formation of micelles. These are formed when the concentration of detergents becomes equal to CMC.

Detailed Solution: Question 11

Detergents with low CMC are more economical to use as they involve the formation of micelle which is used for cleaning oil and dirt from our cloth. Micelle formation takes place when the concentration of detergent becomes equal to CMC.

Assertion & Reason Test: Surface Chemistry (Old NCERT) - Question 12
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Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

Assertion : The value of colligative properties are of small order for colloids as compared to true solution.

Reason : Number of particles in colloidal solution is comparatively smaller than true solutions.

Detailed Solution: Question 12

Colligative properties depend upon the number of particles.

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About this NEET Practice Test

This test contains 12 MCQs on Assertion & Reason Test: Surface Chemistry (Old NCERT) with detailed solutions for each question. It is part of the Physical Chemistry for NEET course on EduRev, designed to align with the current NEET syllabus. Each solution explains not just the correct answer but also gives you an understanding of the topic — not just to attempt the question but also help you prepare for the exam with practice.

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