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Infinity Learn provides comprehensive NCERT Exemplar Solutions for Class 12 Chemistry Chapter 5 Surface Chemistry, which include detailed solutions, extra questions, and numerical problems. Solving these exemplar questions helps students grasp both basic and advanced concepts related to the chapter. The marks scored in Class 12 are crucial for college admissions, making it essential for students to practice questions from NCERT Exemplar books to score well in the CBSE exams.
The expert faculty at Infinity Learn meticulously designs these solutions to aid students in performing well in their board exams. By referring to these solutions, students can systematically answer difficult questions based on the CBSE syllabus mark weightage.
This approach not only builds a solid foundation of fundamental concepts but also helps students ace their board exams with confidence. The NCERT Exemplar for Class 12 Solutions is available in both online and offline formats, allowing students to access them as per their convenience.
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Q. At the equilibrium position in the process of adsorption ___________.
(i) ∆H > 0
(ii) ∆H = T∆S
(iii) ∆H > T∆S
(iv) ∆H < T∆S
Answer: Option (ii) is the Correct answer.
Q. Which of the following process does not occur at the interface of phases?
(i) crystallisation
(ii) heterogeneous catalysis
(iii) homogeneous catalysis
(iv) corrosion
Answer: Option (iii) is the Correct answer.
Q. The term ‘sorption’ stands for ____________.
(i) absorption
(ii) adsorption
(iii) both absorption and adsorption
(iv) desorption
Answer: Option (iii) is the Correct answer.
Q. The extent of adsorption of adsorbate from the solution phase increases with ________.
(i) increase in the amount of adsorbate in solution.
(ii) the decrease in surface area of the adsorbent.
(iii) increase in temperature of the solution.
(iv) the decrease in the amount of adsorbate in solution
Answer: Option (i) is the Correct answer.
Also Read: NCERT Syllabus
Q. Which of the following is not a favourable condition for physical adsorption?
(i) high pressure
(ii) negative ∆H
(iii) the higher critical temperature of adsorbate
(iv) high temperature
Answer: Option (iv) is the Correct answer.
Q. In physisorption adsorbent does not show specificity for any particular gas because ______________.
(i) involved van der Waals forces are universal.
(ii) gases involved behave like ideal gases.
(iii) enthalpy of adsorption is low.
(iv) it is a reversible process.
Answer: Option (i) is the Correct answer.
Q. At high concentration of soap in water, soap behaves as ____________.
(i) molecular colloid
(ii) associated colloid
(iii) macromolecular colloid
(iv) lyophilic colloid
Answer: Option (ii) is the Correct answer.
Short Answer Types
Q. Why is it important to have a clean surface in surface studies?
Ans. A clean surface ensures accurate measurements of adsorption and catalytic properties, as impurities can interfere with surface reactions.
Q. Why is chemisorption referred to as activated adsorption?
Ans. Chemisorption involves a chemical reaction between the surface and adsorbate, often requiring activation energy to form strong chemical bonds.
Q. What type of solutions are formed on dissolving different concentrations of soap in water?
Ans. Dilute solutions form true solutions, while concentrated solutions form colloidal solutions known as micelles.
Q. What happens when gelatin is mixed with gold sol?
Ans. Gelatin stabilizes the gold sol by forming a protective layer around the gold particles, preventing their coagulation.
Q. How does it become possible to cause artificial rain by spraying silver iodide on clouds?
Ans. Silver iodide acts as a nucleating agent, causing water droplets to coalesce and form larger droplets that fall as rain.
Q. Gelatin, which is a peptide, is added to ice creams. What can be its role?
Ans. Gelatin acts as a stabilizer and thickener, preventing the formation of large ice crystals and improving the texture of the ice cream.
Q. What is collodion?
Ans. Collodion is a solution of nitrocellulose in ether and alcohol, used in medical dressings and photographic films.
Q. Why do we add alum to purify water?
Ans. Alum helps in coagulating and precipitating impurities, making them easier to remove from water.
Read More: NCERT Syllabus Class 12
Q. What happens when an electric field is applied to a colloidal solution?
Ans. The colloidal particles move towards the electrode of opposite charge, a process known as electrophoresis.
Q. What causes Brownian motion in colloidal dispersion?
Ans. Brownian motion is caused by the random collision of colloidal particles with the molecules of the dispersion medium.
Q. A colloid is formed by adding FeCl3 to excess hot water. What will happen if excess sodium chloride is added to this colloid?
Ans. Excess sodium chloride will cause the colloidal particles to coagulate and settle out of the solution.
Q. How do emulsifying agents stabilize the emulsion?
Ans. Emulsifying agents form a protective layer around dispersed droplets, reducing the interfacial tension and preventing the droplets from coalescing.
Q. Why are some medicines more effective in the colloidal form?
Ans. Colloidal medicines have a larger surface area for absorption, improving their efficacy and rate of action.
Q. Why does leather get hardened after tanning?
Ans. Tanning introduces cross-links between collagen fibers in the leather, making it more durable and resistant to decomposition.
Q. How does the precipitation of colloidal smoke take place in a Cottrell precipitator?
Ans. In a Cottrell precipitator, charged plates attract and neutralize the charged particles in the smoke, causing them to coagulate and precipitate.
More Resources for Class 12
- NCERT Exemplar Solutions for Class 12 Physics
- NCERT Exemplar Solutions for Class 12 Biology
- NCERT Exemplar Solutions for Class 12 Maths
Concepts in Chapter 5 Surface Chemistry
- Adsorption
- The distinction between Adsorption and Absorption
- Mechanism of Adsorption
- Types of Adsorption
- Adsorption Isotherms
- Adsorption from Solution Phase
- Applications of Adsorption
- Catalysis
- Homogeneous and Heterogeneous Catalysis
- Adsorption Theory of Heterogeneous Catalysis
- Shape-Selective Catalysis by Zeolites
- Enzyme Catalysis
- Catalysts in Industry
- Colloids
- Classification of Colloids
- Classification Based on the Physical State of Dispersed Phase and Dispersion Medium
- Classification Based on the Nature of Interaction between Dispersed Phase and Dispersion Medium
- Classification Based on the Type of Particles of the Dispersed Phase, Multi-molecular, Macro molecular and Associated Colloids
- Preparation of Colloids
- Purification of Colloidal Solutions
- Properties of Colloidal Solutions
- Emulsions
- Colloids around Us
This solution includes a variety of question types such as MCQs, match the following, fill in the blanks, true or false, and numerical problems. These questions are crucial for preparing for competitive exams like JEE, NEET, AIPMT, and state board entrance exams. To aid students in their exam preparation, we have provided comprehensive solutions for the NCERT Exemplar Class 12 Chemistry Chapter 5 Surface Chemistry.
FAQs on NCERT Exemplar Class 12 Chemistry Chapter 5
Is Infinity Learn NCERT Exemplar for Class 12 Chemistry Chapter 5 useful for the CBSE students?
Yes, the NCERT Exemplar for Class 12 Chemistry Chapter 5 from Infinity Learn is crafted by subject matter experts in accordance with the latest CBSE board syllabus. These solutions enable students to answer textbook questions effortlessly, helping them identify and address their weak areas to enhance their academic performance.
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A strong grasp of crucial topics is essential for scoring high marks in Class 12 exams. Chemistry, being a significant scoring subject, includes various chemical equations and numerical problems that are vital from an examination standpoint. Students can effectively learn these concepts through NCERT Exemplar Solutions provided by Infinity Learn. These solutions are accessible to students anytime and anywhere, offering comprehensive guidance to help them excel in their exams.
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Finding the right study materials is essential when preparing for Class 12 exams. At Infinity Learn, we provide chapter-wise solutions tailored to students of varying abilities. The NCERT Exemplar for Class 12 Chemistry Solutions offers clear explanations and alternative methods for tackling complex questions, helping students resolve their doubts effectively. These solutions are available for free, both online and offline, ensuring that students can access them anytime and anywhere.
