Table of Contents
The NCERT Exemplar Solutions for Class 12 Chemistry Chapter 15 Polymers offer a comprehensive range of multiple-choice questions, short and long answer questions, fill-in-the-blanks, match the following, true or false, important questions, worksheets, exercises, and assignments.
Solving these exemplar questions helps students thoroughly understand the topics covered in this chapter from an exam perspective. These NCERT Solutions not only enhance exam preparation but also equip students to confidently tackle various graduate entrance exams. For detailed study resources, visit Infinity Learn.
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Q. Which of the following is an example of a condensation polymer?
(a) Polyethylene
(b) Nylon-6,6
(c) PVC
(d) Polystyrene
Answer: (b) Nylon-6,6
Q. Bakelite is a polymer formed by the condensation of:
(a) Phenol and formaldehyde
(b) Ethylene glycol and terephthalic acid
(c) Urea and formaldehyde
(d) Adipic acid and hexamethylene diamine
Answer: (a) Phenol and formaldehyde
Q. Which of the following polymers is used to make non-stick cookware?
(a) Polystyrene
(b) Polyvinyl chloride
(c) Teflon
(d) Polypropylene
Answer: (c) Teflon
Q. Natural rubber is a polymer of:
(a) Isoprene
(b) Vinyl chloride
(c) Styrene
(d) Acrylonitrile
Answer: (a) Isoprene
Q. Which of the following is not a synthetic polymer?
(a) Nylon
(b) Bakelite
(c) Cellulose
(d) Teflon
Answer: (c) Cellulose
Also Read: NCERT Syllabus
Q. Which type of polymerization involves the formation of free radicals?
(a) Addition polymerization
(b) Condensation polymerization
(c) Both (a) and (b)
(d) None of these
Answer: (a) Addition polymerization
Q. Which of the following is a biodegradable polymer?
(a) Polythene
(b) Polystyrene
(c) Polyhydroxybutyrate (PHB)
(d) Nylon-6
Answer: (c) Polyhydroxybutyrate (PHB)
Q. Dacron is a polyester obtained by the polymerization of:
(a) Terephthalic acid and ethylene glycol
(b) Adipic acid and hexamethylene diamine
(c) Caprolactam
(d) Formaldehyde and urea
Answer: (a) Terephthalic acid and ethylene glycol
Q. Which of the following is an example of an elastomer?
(a) Nylon
(b) Bakelite
(c) Natural rubber
(d) Polystyrene
Answer: (c) Natural rubber
Q. Which of the following polymers is used for making transparent optical lenses?
(a) Polyvinyl chloride (PVC)
(b) Polystyrene
(c) Polymethyl methacrylate (PMMA)
(d) Polyethylene
Answer: (c) Polymethyl methacrylate (PMMA)
Q. The polymer obtained by polymerization of styrene is known as:
(a) Polystyrene
(b) Polypropylene
(c) Polyethylene
(d) Polystyrene-butadiene
Answer: (a) Polystyrene
Q. Which of the following monomers forms natural rubber?
(a) Isobutylene
(b) Isoprene
(c) Ethylene
(d) Propylene
Answer: (b) Isoprene
Q. Which of the following is used in the vulcanization of rubber?
(a) Sulfur
(b) Phosphorus
(c) Oxygen
(d) Nitrogen
Answer: (a) Sulfur
Q. What type of polymer is formed from the polymerization of ethylene?
(a) Addition polymer
(b) Condensation polymer
(c) Biodegradable polymer
(d) Copolymer
Answer: (a) Addition polymer
Q. Which of the following is a characteristic of thermosetting polymers?
(a) They can be remolded
(b) They are soluble in organic solvents
(c) They become soft on heating
(d) They cannot be remolded once set
Answer: (d) They cannot be remolded once set
Read More: NCERT Syllabus Class 12
Short Answer Types
Q. What are polymers? Give an example.
Answer: Polymers are large molecules made up of repeating structural units called monomers, linked by covalent bonds. Example: Polyethylene.
Q. What is the difference between addition and condensation polymers?
Answer: Addition polymers form by the addition of monomers with double or triple bonds without loss of any molecule, e.g., Polyethylene. Condensation polymers form by the reaction between monomers with the elimination of small molecules like water, e.g., Nylon-6,6.
Q. Define co-polymerization with an example.
Answer: Co-polymerization is the process of polymerizing two or more different monomers to form a co-polymer. Example: SBR (Styrene-Butadiene Rubber) formed from styrene and butadiene.
Q. What are biodegradable polymers? Give an example.
Answer: Biodegradable polymers are polymers that can be broken down by microorganisms into water, carbon dioxide, and biomass. Example: Polylactic acid (PLA).
Q. Explain the term ‘Tacticity’ in polymers.
Answer: Tacticity refers to the arrangement of pendant groups (side chains) on the polymer backbone. It can be isotactic (same side), syndiotactic (alternating sides), or atactic (random arrangement).
Q. What is vulcanization of rubber?
Answer: Vulcanization is the process of heating raw rubber with sulfur to form cross-links between polymer chains, enhancing elasticity and strength.
Q. What are thermoplastic and thermosetting polymers?
Answer: Thermoplastic polymers soften on heating and can be remolded, e.g., Polyethylene. Thermosetting polymers harden permanently on heating and cannot be remolded, e.g., Bakelite.
Q. Give an example of a polymer used in making non-stick cookware.
Answer: Polytetrafluoroethylene (PTFE), commonly known as Teflon, is used in making non-stick cookware.
Read More: NCERT Exemplar Solutions for Class 12
Q. What is the role of initiators in free radical polymerization?
Answer: Initiators generate free radicals that start the chain reaction in free radical polymerization by breaking the double bonds of monomers.
Q. What are the characteristics of chain-growth polymerization?
Answer: Chain-growth polymerization involves the growth of polymer chains from an active center, with monomers adding one by one. It features high molecular weight polymers forming rapidly.
Q. What are conducting polymers? Give an example.
Answer: Conducting polymers are polymers that conduct electricity. Example: Polyaniline.
Q. What is a homo-polymer? Provide an example.
Answer: A homo-polymer is a polymer made from a single type of monomer. Example: Polyvinyl chloride (PVC) from vinyl chloride monomer.
Q. Explain the term ‘degree of polymerization’.
Answer: The degree of polymerization is the number of repeating units (monomers) in a polymer chain.
Q. What is the function of plasticizers in polymers?
Answer: Plasticizers are added to polymers to increase flexibility, reduce brittleness, and enhance the flow properties of the polymer.
Q. What is the structure of Bakelite?
Answer: Bakelite is a thermosetting polymer formed from the condensation reaction of phenol with formaldehyde. It has a highly cross-linked structure.
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FAQs on NCERT Exemplar Solutions for Class 12 Chemistry Chapter 15
What types of questions are included in the NCERT Exemplar Solutions for Class 12 Chemistry Chapter 15 Polymers?
The NCERT Exemplar Solutions for Class 12 Chemistry Chapter 15 Polymers include multiple-choice questions, short and long answer questions, fill-in-the-blanks, match the following, true or false, and important conceptual questions. These diverse question types help students grasp the key concepts and prepare thoroughly for exams. For detailed solutions and explanations, visit Infinity Learn.
How can the NCERT Exemplar Solutions for Chapter 15 Polymers help in board exam preparation?
The NCERT Exemplar Solutions for Chapter 15 Polymers provide comprehensive answers and detailed explanations, helping students understand the fundamental concepts and solve problems systematically. Practicing these solutions enhances problem-solving skills and boosts confidence, making students well-prepared for board exams. More resources can be found at Infinity Learn.
Are there any additional benefits of using NCERT Exemplar Solutions for competitive exam preparation?
Yes, NCERT Exemplar Solutions for Chapter 15 Polymers include advanced-level questions that are beneficial for competitive exams like JEE and NEET. These solutions help students familiarize themselves with the types of questions asked in competitive exams, improving their analytical and application skills. For further practice and detailed solutions, refer to Infinity Learn.
