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NCERT exemplar Class 12 Chemistry solutions chapter 15 is an important chapter which holds great importance in an exam point of view. It answers How did the manufacturing industries like clothing, toys, packaging, automobile, electrical, medicine, capsules flourish? What made our daily lives convenient and much more colourful? Who played a significant role in all these industries? NCERT exemplar Class 12 Chemistry chapter 15 solutions answers these questions with a single word- Polymer. Also, these NCERT exemplar Class 12 Chemistry solutions chapter 15 pdf download can help in accessing answers offline.
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NCERT exemplar solutions for Class 12 Chemistry chapter 15 defines the word 'polymer' by two Greek words: poly meaning- many and mer meaning- part. A polymer is a giant molecule with a high molecular mass, made by linking together repetitive structural units on a massive scale, called monomers, forming polymers through polymerization.
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The Class 12 Chemistry NCERT exemplar solutions chapter 15 provided here would help you clear your confusion between several polymers and help you get a clear understanding of this chapter to perform well in the 12 boards and competitive exams.
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Question:1
Which of the following polymers of glucose is stored by animals?
(i) Cellulose
(ii) Amylose
(iii) Amylopectin
(iv) Glycogen
Answer:
The answer is the option (iv). Amongst the given options, glycogen is a polymer of glucose that is found in liver, brain and muscles of animals.Question:2
Which of the following is not a semisynthetic polymer?
(i) cis-polyisoprene
(ii) Cellulose nitrate
(iii) Cellulose acetate
(iv) Vulcanised rubber
Answer:
The answer is the option (i). Of all the given options, Cis-polyisoprene is not a semisynthetic polymer. m-polyisoprene is a natural polymer while the others are semisynthetic polymers.Question:3
The commercial name of polyacrylonitrile is ______________.
(i) Dacron
(ii) Orlon (Acrilan)
(iii) PVC
(iv) Bakelite
Answer:
The answer is the option (ii). The commercial name of polyacrylonitrile is Orion (acrilan). It is used as a substitute for wool in making commercial fibres.Question:4
Which of the following polymer is biodegradable?
Answer:
The answer is the option (iii). PHBV is biodegradable in nature. It is formed by the copolymerisation of 3-hydroxybutanoic acid and 3-hydroxypentanoic acid.Question:5
In which of the following polymers ethylene glycol is one of the monomer units?
Answer:
The answer is the option (i). The polymer given below is obtained on condensation polymerisation of ethylene glycol and phthalic acid. The water molecule gets eliminated in the process.Question:6
Which of the following statements is not true about low-density polythene?
(i) Tough
(ii) Hard
(iii) Poor conductor of electricity
(iv) Highly branched structure
Answer:
The answer is the option (iii). We can obtain low-density polythene by polymerisation of ethane under high pressure. It tough but flexible (not too hard) in nature and has a highly branched structure.Question:8
Which of the following polymer can be formed by using the following monomer unit?
(i) Nylon 6, 6
(ii) Nylon 2–nylon 6
(iii) Melamine polymer
(iv) Nylon-6
Answer:
The answer is the option (iv). Nylon -6 is the polymer formed by heating caprolactam with water at a high temperature.Question:9
Which of the following polymers, need at least one diene monomer for their preparation?
(i) Dacron
(ii) Buna-S
(iii) Neoprene
(iv) Novolac
Answer:
The answer is the option (ii, iii) Buna-S and neoprene need at least one diene monomer in their preparation. Buna-S is prepared by copolymerisation of 1, 3-butadiene and styrene in the presence of peroxide catalyst.Question:10
Which of the following are characteristics of thermosetting polymers?
(i) Heavily branched cross-linked polymers.
(ii) Linear slightly branched long-chain molecules.
(iii) Become infusible on moulding so cannot be reused.
(iv) Soften on heating and harden on cooling, can be reused.
Answer:
The answer is the option (i, iii) Thermosetting polymers or thermoset are heavily branched and cross-linked molecules. They cannot be reused as they become infusible on the moulding.Question:11
Which of the following polymers are thermoplastic?
(i) Teflon
(ii) Natural rubber
(iii) Neoprene
(iv) Polystyrene
Answer:
The answer is the option (i, iv) Thermoplastic polymers can be repeatedly softened on heating and hardened on cooling. Thus, they can be remoulded again and again. Teflon and polystyrene are common examples of thermoplastics.Question:12
Which of the following polymers are used as fibre?
(i) Polytetrafluoroethane
(ii) Polychloroprene
(iii) Nylon
(iv) Terylene
Answer:
The answer is the option (iii, iv) Fibres have high tensile strength and modulus due to strong intermolecular forces like H-bonding. This leads to close packing in chain resulting in crystalline nature. Polyamides (Nylon) and Polyesters (terylene) are used as fibres.Question:13
Which of the following are addition polymers?
(i) Nylon
(ii) Melamine formaldehyde resin
(iii) Orlon
(iv) Polystyrene
Answer:
The answer is the option (iii, iv) Orion and polystyrene are examples of addition polymers formed by repeated addition of monomer molecules. Orion is made by polymerisation of and polystyrene byQuestion:14
Which of the following polymers are condensation polymers?
(i) Bakelite
(ii) Teflon
(iii) Butyl rubber
(iv) Melamine formaldehyde resin
Answer:
The answer is the option (i, iv) Phenol when heated with formaldehyde gives an infusible solid mass known as bakelite. On condensation polymerisation of melamine and formaldehyde, melamine formaldehyde resin is obtained.Question:15
Which of the following monomers form biodegradable polymers?
(i) 3-hydroxybutanoic acid + 3-hydroxypentanoic acid
(ii) Glycine + aminocaproic acid
(iii) Ethylene glycol + phthalic acid
(iv) Caprolactam
Answer:
The answer is the option (i, ii) The polymers which are easily decomposed are known as biodegradable polymer. PHBV is biodegradable in nature. It is formed by the copolymerisation of 3-hydroxybutanoic acid and 3-hydroxypentanoic acid. Glycine + amino caproic acid on copolymerisation give Nylon-2-nylon 6 which is also biodegradable.Question:16
Which of the following is an example of a synthetic rubber?
(i) Polychloroprene
(ii) Polyacrylonitrile
(iii) Buna-N
(iv) cis-polyisoprene
Answer:
The answer is the option (i, iii)Question:17
Which of the following polymers can have strong intermolecular forces?
(i) Nylon
(ii) Polystyrene
(iii) Rubber
(iv) Polyesters
Answer:
The answer is the option (i, iv). Polyamides (Nylon) and Polyesters (terylene) have high tensile strength and modulus due to strong intermolecular forces like H-bonding. This leads to close packing in the chain resulting in crystalline nature. That is why they are used as thread forming fibres.Question:18
Which of the following polymers have vinylic monomer units?
(i) Acrilan
(ii) Polystyrene
(iii) Nylon
(iv) Teflon
Answer:
The answer is the option (i, ii, iv) Amongst the given options, acrilan, polystyrene and Teflon has vinylicQuestion:19
Vulcanisation makes rubber ______________.
(i) more elastic
(ii) soluble in inorganic solvent
(iii) crystalline
(iv) more stiff
Answer:
The answer is the option (i, iv). Vulcanisation is a chemical process wherein rubber is heated with Sulphur to form cross-links between rubber molecules. The process is carried to improve the physical properties like elasticity of natural rubber. It makes the rubber stiffer.Question:21
Answer:
Polymerisation of single monomeric species (one type of monomer unit) gives homopolymers. In this case the unit is A.Question:22
Answer:
Polymers wherein repeating structural unit has 2 types of monomer units (let’s say A and B) are known as copolymers.Question:23
Answer:
It is a type of chain growth polymerisation because only addition occurs in this.Question:24
Identify the type of polymer given in the following figure.
Answer:
The polymer given in the diagram is a cross linked polymer because a 3- D network structure (giant molecule) is formed from various polymer chains.Question:25
Identify the polymer given below :
Answer:
The polymer given is cis-polyisoprene (natural rubber) and has a coiled structure. It shows elastic properties as well.Question:26
Why are rubbers called elastomers?
Answer:
Rubber is a natural polymer with elastic properties, i.e. it stretches and relaxes with the application or removal of external force. That is why these are called elastomers.Question:27
Can the enzyme be called a polymer?
Answer:
Since enzymes are biocatalysts that are basically proteins, they can be called polymers.Question:28
Can nucleic acids, proteins and starch be considered as step growth polymers?
Answer:
Step growth polymers are formed by condensation polymerisation reaction resulting in the loss of simple molecule like water, alcohol that in turn, results in the formation of high molecular mass polymers. Nucleic acids, proteins and starch are formed in the same way. Hence, they can be considered as step-growth polymers.Question:29
How is the following resin intermediate prepared and which polymer is formed by this monomer unit?
Answer:
The given intermediate is formed by the condensation polymerisation of melamine and formaldehyde. Its polymerisation gives melamine formaldehyde.Question:30
To have practical applications, why are cross-links required in rubber?
Answer:
Cross-links are formed in the process of vulcanisation which is done to improve the physical properties of natural rubber. By cross-linking, rubber gets hard and tough due to increased tensile strength. The vulcanised rubber has higher elasticity, increased stiffness and low water absorption tendency.Question:31
Why does cis-polyisoprene possess elastic property?
Answer:
The cis-polyisoprene molecule has a coiled structure. In it, several chains are held together by weak van der Waals interactions. This is why they possess elastic property.Question:32
Answer:
or Low-density polythene has a highly branched molecular structure. It has low density (0.92 g/cm 3) and low melting point, as the molecules do not pack well due to branching. It is transparent and chemically inert with moderate toughness.Question:33
Answer:
The role of Benzoyl peroxide in free radical addition polymerisation of alkenes is to generate free radicals and act as an initiator of the reaction by providing chain initiation.Question:34
Which factor imparts crystalline nature to a polymer like nylon?
Answer:
Polymers like nylon have strong intermolecular forces like hydrogen bonding that lead to close packing of polymer chains. This, along with the linear structure, gives a crystalline nature to the polymer.Question:35
Answer:
The polymer is a urea-formaldehyde resin and the monomeric units are urea and formaldehyde.Question:36
Answer:
The biomolecules having some structural similarity with synthetic polyamides are protein. The similarity is that the polyamides and proteins both contain amide linkage.Question:37
Why should the monomers used in addition polymerisation through free radical pathway be very pure?
Answer:
The monomers used in addition polymerisation through free radical should be very pure because even a tiny amount of impurities may act as initiators leading to the formation of polymers with small chain lengths.Question:38
Match the polymer of column I with a correct monomer of column II.
Column I | Column II |
(i) High density polythene | (a) Isoprene |
(ii) Neoprene | (b) Tetrafluoroethene |
(iii) Natural rubber | (c) Chloroprene |
(iv) Teflon | (d) Acrylonitrile |
(v) Acrilan | (e) Ethene |
Answer:
(i e), (ii c), (iii a), (iv b), (v d)Question:39
Match the polymers given in Column I with their chemical names given in Column II.
Column I | Column II |
(i) Nylon 6 | (a) Polyvinyl chloride |
(ii) PVC | (b) Polyacrylonitrile |
(iii) Acrilan | (c) Polycaprolactum |
(iv) Natural rubber | (d) Low density Polythene |
(v) LDP | (e) cis-polyisoprene |
Answer:
(i c), (ii a), (iii b), (iv e), (v d)Question:40
Match the polymers given in Column I with their commercial names given in Column II.
Column I | Column II |
(i) The polyester of glycol and phthalic acid | (a) Novolac |
(ii) The copolymer of 1, 3-butadiene and styrene | (b) Glyptal |
(iii) Phenol and formaldehyde resin | (c) Buna-S |
(iv) The polyester of glycol and terephthalic acid | (d) Buna -N |
(v) The copolymer of 1, 3-butadiene and acrylonitrile | (e) Dacron |
Answer:
(i b), (ii c), (iii a), (iv e), (v d)Question:41
Match the polymers given in Column I with their main applications given in Column II.
Column I | Column II |
i) Bakelite | (a) Unbreakable crockery |
ii) Low-density polythene | (b) Non-stick cookwares |
iii) Melamine-formaldehyde resin | (c) Packaging material for shock absorbance |
iv) Nylon 6 | (d) Electrical switches |
v) Polytetrafluoroethane | (e) Squeeze bottles |
vi) Polystyrene | (f) Tyre, cords |
Answer:
(i d), (ii e), (iii a), (iv f), (v b), (vi c)Question:43
Column I | Column II |
(i) Terylene | (a) Glycosidic linkage |
(ii) Nylon | (b) Ester linkage |
(iii) Cellulose | (c) Phosphodiester linkage |
(iv) Protein | (d) Amide linkage |
(v) RNA |
Answer:
(i b), (ii d), (iii a), (iv d), (v c)Question:44
Match materials are given in Column I with the polymers given in Column II.
Column I | Column II |
(i) Natural rubber latex | (a) Nylon |
(ii) Wood laminates | (b) Neoprene |
(iii) Ropes and fibres | (c) Dacron |
(iv) Polyester fabric | (d) Melamine formaldehyde resins |
(v) Synthetic rubber | (e) Urea-formaldehyde resins |
(vi) Unbreakable crockery | (f) cis-polyisoprene |
Answer:
(i f), (ii e), (iii a), (iv c), (v b), (vi d)Question:45
Match the polymers given in Column I with their repeating units given in Column II
Column I | Column II |
(i) Acrilan | (a) |
(ii) Polystyrene | (b) |
(iii) Neoprene | (c) |
(iv) Novolac | (d) |
(v) Buna-N | (e) |
(f) |
Answer:
(i d), (ii a), (iii b), (iv e),(v c)In the following question a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: Rayon is a semi-synthetic polymer and is taken as a better choice than cotton fabric.
Reason: Mechanical and aesthetic properties of cellulose can be improved by acetylation.
(i) Assertion and reason both are correct statements, but reason does not explain the assertion.
(ii) Assertion and reason both are correct statements, and reason explain the assertion.
(iii) Both assertion and reason are the wrong statements.
(iv) The assertion is correct statement and reason is the wrong statement.
(v) The assertion is the wrong statement and reason is the correct statement.
Answer:
The answer is the option (ii). Rayon is semi-synthetic polymer and is taken as a better choice than cotton fabric because mechanical and aesthetic properties of cellulose can be improved by acetylation. Thus, both assertion and reason are correct with the latter being the correct explanation.Question:47
In the following question a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: Most of the Synthetic polymers are not biodegradable.
Reason: Polymerisation process induces toxic character in organic molecules.
(i) Assertion and reason both are correct statements, but reason does not explain the assertion.
(ii) Assertion and reason both are correct statements, and reason explain the assertion.
(iii) Both assertion and reason are the wrong statements.
(iv) The assertion is correct statement and reason is the wrong statement.
(v) The assertion is the wrong statement and reason is the correct statement.
Answer:
The answer is the option (iv). Most of the synthetic polymers are non-biodegradable in nature i.e. they are not degraded by enzymatic, hydrolytic and environmental oxidation. Polymerisation process does not induce toxic characters in organic molecules.Question:48
In the following question a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: Olefinic monomers undergo addition polymerisation.
Reason: Polymerisation of vinyl chloride is initiated by peroxides/persulphates.
(i) Assertion and reason both are correct statements, but reason does not explain the assertion.
(ii) Assertion and reason both are correct statements, and reason explain the assertion.
(iii) Both assertion and reason are the wrong statements.
(iv) The assertion is correct statement and reason is the wrong statement.
(v) The assertion is the wrong statement and reason is the correct statement.
Answer:
The answer is the option (i). Olefinic monomers like ethene undergo addition polymerisation. The monomers used in addition polymerisation reaction are unsaturated compounds like alkenes, alkadienes etc. The assertion and reason both are correct statements but the reason does not explain the assertion.Question:49
In the following question a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: Polyamides are best used as fibres because of high tensile strength.
Reason: Strong intermolecular forces (like hydrogen bonding within polyamides) lead to close packing of chains and increase the crystalline character, hence, provide high tensile strength to polymers.
(i) Assertion and reason both are correct statements, but reason does not explain the assertion.
(ii) Assertion and reason both are correct statements, and reason explain the assertion.
(iii) Both assertion and reason are the wrong statements.
(iv) The assertion is correct statement and reason is the wrong statement.
(v) The assertion is the wrong statement and reason is the correct statement.
Answer:
The answer is the option (ii). Polyamides are best-used fibers because they have high tensile strength. They have closely packed chains and increased crystalline character due to presence of strong inter molecular forces like hydrogen bonding.Question:50
In the following question a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: For making rubber synthetically, isoprene molecules are polymerised.
Reason: Neoprene (a polymer of chloroprene) is a synthetic rubber.
(i) Assertion and reason both are correct statements, but reason does not explain the assertion.
(ii) Assertion and reason both are correct statements, and reason explain the assertion.
(iii) Both assertion and reason are the wrong statements.
(iv) The assertion is correct statement and reason is the wrong statement.
(v) The assertion is the wrong statement and reason is the correct statement.
Answer:
(v) Isoprene (2-methyl-1,3-butadiene) molecule is the monomer for natural rubber. Neoprene (a polymer of chloroprene) is a synthetic rubber.Question:51
In the following question a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: Network polymers are thermosetting.
Reason: Network polymers have high molecular mass.
(i) Assertion and reason both are correct statements, but reason does not explain the assertion.
(ii) Assertion and reason both are correct statements, and reason explain the assertion.
(iii) Both assertion and reason are the wrong statements.
(iv) The assertion is correct statement and reason is the wrong statement.
(v) The assertion is the wrong statement and reason is the correct statement.
Answer:
The answer is the option (i). Network polymers are thermosetting and have high molecular mass. However, the reason they are thermosetting is because of extensive cross-linking during polymerisation and not because of higher molecular mass.Question:52
In the following question a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: Polytetrafluoroethene is used in making non-stick cookware.
Reason: Fluorine has the highest electronegativity.
(i) Assertion and reason both are correct statements, but reason does not explain the assertion.
(ii) Assertion and reason both are correct statements, and reason explain the assertion.
(iii) Both assertion and reason are the wrong statements.
(iv) The assertion is correct statement and reason is the wrong statement.
(v) The assertion is the wrong statement and reason is the correct statement.
Answer:
The answer is the option (i). Polytetrafluoroethene or Teflon is used in making nonstick cookware, as it is chemically inert, resistant to attack by corrosive reagents and thermally stable.Question:53
Answer:
Synthetic polymers are non-biodegradable as they are resistant to environmental degradation process. They form a major share of the polymer solid waste material.Question:54
Differentiate between rubbers and plastics on the basis of intermolecular forces.
Answer:
Rubber | Plastics |
The molecule consists of chains held together by weak Van Der Waals interaction. | Intermolecular forces of attarction intermediate between elastomers and fibre. |
Coiled structure | Linear or slightly branched long chain |
Returns to its original shape, size and length after being stretched. | Not really elastic in nature but capable of softening on heating and hardening on cooling. |
Question:56
Answer:
LDP | HDP |
Formed at a temperature of 350 K to 570 K and very high pressure of about 1000-2000 atm. | The temperature of about 333 K to 343 K and a pressure of 6-7 atm is required. |
It is obtained by free-radical addition and has a highly branched structure. | It has straight linear molecules and a high density. |
Chemically inert and tough but flexible. | Chemically inert. Tougher and harder than LDP |
Question:57
Answer:
Thermoplastic polymers soften on heating and harden on cooling. Polythene, polyvinyl and polystyrene are thermoplastic polymers. Their intermolecular force of attraction is somewhere between elastomers and fibres. They soften on heating and harden on cooling.NCERT exemplar Class 12 Chemistry chapter 15 solutions Polymers have a diverse range of industrial and commercial uses. Industries like automotive, aerospace, electronics, packaging, and medical use polymers' adaptability and flexibility. They are used in drug delivery, biometric sensors, genetic engineering, aerospace engineering, and cosmetics. The wide range of polymers is still expanding and NCERT exemplar solutions for Class 12 Chemistry chapter 15 can be really helpful in understanding all these.
They have been used in sports, molecular recognition, water purification, biopolymers to save the environment, bulletproof vests, fire resistance, holography, renewable biomass applications, and 3D printing.
Without polymers, our lives would not have been so easy going and fast. From plastic packaging to huge rocket structures, polymers have always been the backbone of many major industries.
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 |
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Class 12 Chemistry NCERT exemplar solutions chapter 15 help in learning, the process of polymerization, the types of polymerization, the source of polymers, the types of polymers, the properties, and natural polymers.
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The NCERT exemplar solutions for Class 12 Chemistry chapter 15 include all the questions present in the main exercise.
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If you have uploaded screenshot of your 12th board result taken from CBSE official website,there won,t be a problem with that.If the screenshot that you have uploaded is clear and legible. It should display your name, roll number, marks obtained, and any other relevant details in a readable forma.ALSO, the screenshot clearly show it is from the official CBSE results portal.
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Hello Akash,
If you are looking for important questions of class 12th then I would like to suggest you to go with previous year questions of that particular board. You can go with last 5-10 years of PYQs so and after going through all the questions you will have a clear idea about the type and level of questions that are being asked and it will help you to boost your class 12th board preparation.
You can get the Previous Year Questions (PYQs) on the official website of the respective board.
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