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NCERT Solutions for Class 12 Chemistry Chapter 15 Polymers - Hey are you stuck while solving your homework problems? Now you can resolve all your doubts here. Just scroll down to get NCERT solutions for class 12 chemistry chapter 15 Polymers. This Class 12 Chemistry Chapter 15 NCERT solutions contains a total of 6 intext questions and 20 questions in the exercise at chapter end. The NCERT Solutions for Class 12 Chemistry Chapter 15 are prepared in a comprehensive manner so that you will also learn how to write answers in your exams. These NCERT solutions help you in your preparation of CBSE board exams as well as in the various competitive exams like JEE, NEET, etc. By referring to the NCERT solutions for class 12, students can understand all the important concepts and practice questions well enough before their examination.
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Topics and Sub-topics of NCERT Textbook Class 12 Chemistry Chapter 15 Polymers-
15.1 Classification of Polymers
15.2 Types of Polymerisation Reactions
15.3 Molecular Mass of Polymers
15.4 Biodegradable Polymers
15.5 Polymers of Commercial Importance
Question 15.1 What are polymers?
Answer :
Polymers- Poly means many and mer means unit or parts. Polymers are high molecular masses macromolecules . These are formed by joining of the repeated units of monomers.
Question 15.3 (1) Write the names of monomers of the following polymers
Answer :
So, the monomer is adipic acid and hexamethylene diamine
Question 15.3 (2) Write the names of monomers of the following polymers
Answer :
It is a polymer of Nylon6 . So, the monomeric unit is Caprolactum.
Question 15.3 (3) Write the names of monomers of the following polymers
Answer :
the above polymer is a Teflon (PTFE)
the monomeric unit is tetrafluroethene
Question 15.4 Classify the following as addition and condensation polymers: Terylene, Bakelite, Polythene, Teflon.
Answer :
Question 15.5 Explain the difference between Buna-N and Buna-S.
Answer :
Buna-N
It is a copolymer of 1,3-Butadiene and acrylonitrile. It is resistant to the action of petrol, lubricating oil and organic solvents. It is used in making oil seals and tank lining etc.
Buna-S
It is formed by copolymerisation of 1,3-Butadiene and Styrene. It is used for making automobiles tyres and rubber soles etc.
Question 15.6 Arrange the following polymers in increasing order of their intermolecular forces.
Nylon 6,6, Buna-S, Polythene
Answer :
Increasing order in their intermolecular forces-
Buna-S(elastomers)<Polyethene<Nylon6, 6(fibres
Question 15.1 Explain the terms polymer and monomer.
Answer :
Polymers- Poly means many and mer means unit or parts. Polymers are high molecular masses macromolecules. These are formed by joining of repeating unit of monomers.
Monomers- These are simple reactive units, which combine together to form large molecules through covalent bond.examples- ethene and hexamethylene diamine, adipic acid.
Question 15.2 What are natural and synthetic polymers? Give two examples of each type.
Answer :
Natural Polymers-
Polymers that formed naturally like formed by animals and plants. these are found in nature. Example- protein, starch, cellulose etc.
Synthetic Polymers-
Polymers made by human beings are called synthetic or man-made polymers. Examples- plastic(polyethene), nylon6,6 and nylon 6 etc.
Question 15.3 Distinguish between the terms homopolymer and copolymer and give an example of each.
Answer :
HOMO-POLYMER
These types of polymers are formed by polymerisation of one type of monomers.
examples - polyethene is the homopolymer of ethene monomers.
CO-POLYMER-
These types of polymers are formed by the polymerisation of two different monomers.
example- Nylon6, 6 is the copolymer of adipic acid and hexamethylene diamine.
Question 15.4 How do you explain the functionality of a monomer?
Answer :
The functionality of a monomer is the number of binding sites present in it. For example, for propene and ethene functionality is one but for adipic acid and 1,3- butadiene is two.
Question 15.5 Define the term polymerisation.
Answer :
The process of formation of polymers or high molecular masses from its respective monomers is known as polymerisation. In polymers monomers are held by cobalent bonds.
Question 15.6 Is , a homopolymer or copolymer?
Answer :
, is a homopolymer because it is obtained from a single monomer of
Question 15 . 7 Why do elastomers possess elastic properties?
Answer :
In elastomers, the polymeric chains are held by weak intermolecular forces of attraction. These weak binding forces allow them to stretch and a few cross-links are there in between the chains, which helps them to retract after stretching or releasing forces. Due to this elastomers are elastic in nature.
Example- Buna-S, Buna-N and Neoprene etc.
Question 15.8 How can you differentiate between addition and condensation polymerisation?
Answer :
Addition Polymerisation- The process of repeated addition of monomer, having a double or triple bond to form polymers. For example, polyethene is formed by the addition polymerisation of ethene.
Condensation Polymerisation- Process of formation of polymers by repeated condensation reaction between two different monomers, having bi-functionality or tri-functionality. A small molecule is eliminated like water and in each condensation step. For example Nylon 6, 6 is a condensation polymerisation of adipic acid and hexamethylene diamine.
Question 15.9 Explain the term copolymerisation and give two examples.
Answer :
The process of formation of polymers of two or more different monomeric units is known as copolymerisation. For example, Buna-S is formed by the copolymerisation.
Question 15.10 Write the free radical mechanism for the polymerisation of ethene.
Answer :
In free radical mechanism, there are three main steps-
1. Chain Initiation - the polymerisation of ethene to polythene consists of heating or exposing to light a mixture of ethene with a small amount of benzoyl peroxide initiator. Generating new and larger free radicals.
2. Chain Propagation Step - As the radical reacts with another molecule of ethene. So, another bigger sized radical is formed. The repetition of this step is chain propagation.
3. Chain Termination step - At some time the product radical reacts with another radical to form the polymerised product and this step is called the chain terminating step.
Question 15.11 Define thermoplastics and thermosetting polymers with two examples of each.
Answer :
Thermoplastic polymers are linear or slightly branched chained molecules. It can be repeatedly softened and hardened on heating. Thus they can be modified again and again. Examples- polyethene and polystyrene. These polymers have intermolecular forces of attraction intermediate between elastomers and fibres. Some examples of common thermoplastics are polyethene, polystyrene, polyvinyls, etc.
Thermosetting Plastics are cross-linked and heavily branched molecules, which get hardened during the moulding process. These polymers cannot be reused. For examples bakelite and urea-formaldehyde resin etc.
Question 15.12(i) Write the monomers used for getting the following polymers.
(i) Polyvinyl chloride
Answer :
For PVC (polyvinyl chloride) we use vinyl chloride as a monomer.
Question 15.12(ii) Write the monomers used for getting the following polymers.
(ii) Teflon
Answer :
The monomeric unit of Teflon (PTFE) is tetraflouroethene ( ). It is resistant to heat and chemical attack.
Question 15.12(iii) Write the monomers used for getting the following polymers.
Bakelite
Answer :
The monomeric unit of abkelite is phenol and formaldehyde.
(a) phenol-
(b) formaldehude-
Question 15.14 How does the presence of double bonds in rubber molecules influence their structure and reactivity?
Answer :
Natural rubber is a linear polymer of isoprene (2-methyl-1, 3-butadiene) and is also called as cis - 1, 4 polyisoprenes. Due to the cis configuration about the double bond, it is difficult to come closer for effective compactness due to the weak intermolecular attraction (van der Waals). Thus natural rubber has a coiled structure and it can be stretched like spring(show elastic nature).
Question 15.15 Discuss the main purpose of vulcanisation of rubber.
Answer :
The natural rubber has many flaws in following ways like-
To improve all these physical properties we do vulcanisation of rubber. During this process, sulphur cross-links are formed, which makes it hard, tough with high tensile strength.
Question 15.16 What are the monomeric repeating units of Nylon-6 and Nylon-6,6?
Answer :
The monomeric repeating unit of Nylon 6 is caprolactam and the monomers of Nylon6, 6 is adipic acid and hexamethylene diamine.
Question 15.17(i) Write the names and structures of the monomers of the following polymers:
Buna-S
Answer :
Name of monomer of Buna-S -(a) (1,3 butadiene)
(b) Styrene
Question 15.17(ii) Write the names and structures of the monomers of the following polymers:
Buna-N
Answer :
The momomeric unit of buna-N is
The structure of the monomer are-
Question 15. 17(iii) Write the names and structures of the monomers of the following polymers:
Dacron
Answer :
The monomer of Dacron is-
-Ethylene glycol
-Terephthalic acid
Structures are-
Question 15.17(iv) Write the names and structures of the monomers of the following polymers:
(iv) Neoprene
Answer :
Monomer of Neoprene is Chloroprene.(2-chloro-1, 3-butadiene)
Structure-
Question 15. 18 (i) Identify the monomer in the following polymeric structures.
Answer :
It is Nylon10, 6
So, the monomer is Decanoic acid [ ]and hexamethylene diamine [ ]
Question 15.18 (ii) Identify the monomer in the following polymeric structures.
Answer :
The above polymer is melamine
So, the monomer is melamine and fomaldehyde( )
Question 15.19 How is dacron obtained from ethylene glycol and terephthalic acid ?
Answer :
Dacron(terelyne) is obtained from polymerisation of ethylene glycol and terepthalic acid at around 420 to 460 K. Also used in blending of cotton and wool fibres.
Question 15.20 What is a biodegradable polymer ? Give an example of a biodegradable aliphatic polyester.
Answer :
Polymers which are decomposed by bacteria are called bio-degradable polymers. Their degraded product does not cause any serious effect on the environment.
Bio-degradable aliphatic polyesters are -
1. poly -hydroxybutyrates-co- -hydroxy valerate(PHBV)
2. Nylon-2-Nylon-6
In this chapter, you will deal with the science of polymers this chapter covers important concepts such as polymers, monomers, polymerization, types of polymers, classification of polymers based on their source and structure, cross-linked or linear polymer with their properties, and importance of polymers in daily life. This chapter holds 3 marks in the CBSE boards exams and after completing the NCERT solutions for Class 12 Chemistry chapter 15 Polymers students will be able to explain the terms like polymer, monomer, and polymerization and realize their importance, able to distinguish between different types of polymerization processes and different classes of polymers. This NCERT syllabus chapter also explains the formation of some important synthetic polymers and their uses and properties.
Important terms and points of NCERT Class 12 Chemistry solutions chapter 15-
1. Polymers- They are very high molecular mass macromolecules, which composed of repeating structural units derived from the monomers. Polymers have a high molecular mass . Rubber, polythene, and nylon 6, 6 are examples of polymers.
2. Monomers- Monomers are simple and reactive molecules that combine in large numbers through covalent bonds to give rise to repeating structural units or polymers. For example propane, vinyl chloride, styrene, etc.
NCERT Solutions Class 12 Chemistry
Chapter 1 | |
Chapter 2 | |
Chapter 3 | |
Chapter 4 | |
Chapter 5 | |
Chapter 6 | |
Chapter 7 | |
Chapter 8 | |
Chapter 9 | |
Chapter 10 | |
Chapter 11 | |
Chapter 12 | |
Chapter 13 | |
Chapter 14 | |
Chapter 15 | Polymers |
Chapter 16 |
If you have a doubt or question that is not available here or in any of the chapters, contact us. You will get all the answers that will help you score well in your exams.
Mostly 1 or 2 questions are asked from this chapter in JEE mains
For complete solutions : https://school.careers360.com/ncert/ncert-solutions-class-12-chemistry
This chapter holds weightage of 3-4 Marks in Board exams. Follow NCERT text book for a good score in the board exam. For more questions refer to NCERT exemplar.
Weightage of NCERT class 12 Chemistry chapter 14 in NEET is 3 percent
hello,
Yes you can appear for the compartment paper again since CBSE gives three chances to a candidate to clear his/her exams so you still have two more attempts. However, you can appear for your improvement paper for all subjects but you cannot appear for the ones in which you have failed.
I hope this was helpful!
Good Luck
Hello dear,
If you was not able to clear 1st compartment and now you giving second compartment so YES, you can go for your improvement exam next year but if a student receives an improvement, they are given the opportunity to retake the boards as a private candidate the following year, but there are some requirements. First, the student must pass all of their subjects; if they received a compartment in any subject, they must then pass the compartment exam before being eligible for the improvement.
As you can registered yourself as private candidate for giving your improvement exam of 12 standard CBSE(Central Board of Secondary Education).For that you have to wait for a whole year which is bit difficult for you.
Positive side of waiting for whole year is you have a whole year to preparing yourself for your examination. You have no distraction or something which may causes your failure in the exams. In whole year you have to stay focused on your 12 standard examination for doing well in it. By this you get a highest marks as a comparison of others.
Believe in Yourself! You can make anything happen
All the very best.
Hello Student,
I appreciate your Interest in education. See the improvement is not restricted to one subject or multiple subjects and we cannot say if improvement in one subject in one year leads to improvement in more subjects in coming year.
You just need to have a revision of all subjects what you have completed in the school. have a revision and practice of subjects and concepts helps you better.
All the best.
If you'll do hard work then by hard work of 6 months you can achieve your goal but you have to start studying for it dont waste your time its a very important year so please dont waste it otherwise you'll regret.
Yes, you can take admission in class 12th privately there are many colleges in which you can give 12th privately.
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A metallurgical engineer is a professional who studies and produces materials that bring power to our world. He or she extracts metals from ores and rocks and transforms them into alloys, high-purity metals and other materials used in developing infrastructure, transportation and healthcare equipment.
An Azure Administrator is a professional responsible for implementing, monitoring, and maintaining Azure Solutions. He or she manages cloud infrastructure service instances and various cloud servers as well as sets up public and private cloud systems.
An AWS Solution Architect is someone who specializes in developing and implementing cloud computing systems. He or she has a good understanding of the various aspects of cloud computing and can confidently deploy and manage their systems. He or she troubleshoots the issues and evaluates the risk from the third party.
Careers in computer programming primarily refer to the systematic act of writing code and moreover include wider computer science areas. The word 'programmer' or 'coder' has entered into practice with the growing number of newly self-taught tech enthusiasts. Computer programming careers involve the use of designs created by software developers and engineers and transforming them into commands that can be implemented by computers. These commands result in regular usage of social media sites, word-processing applications and browsers.
A Product Manager is a professional responsible for product planning and marketing. He or she manages the product throughout the Product Life Cycle, gathering and prioritising the product. A product manager job description includes defining the product vision and working closely with team members of other departments to deliver winning products.
Individuals in the information security manager career path involves in overseeing and controlling all aspects of computer security. The IT security manager job description includes planning and carrying out security measures to protect the business data and information from corruption, theft, unauthorised access, and deliberate attack