CBSE Class 12 Chemistry Polymers Worksheet

Question. Which of the following is a natural polymer?
(a) cis-1, 4-polyisoprene
(b) poly (Butadiene-styrene)
(c) polybutadiene
(d) poly (Butadiene-acrylonitrile) 
Answer. A

Question. The polymer that is used as a substitute for wool in making commercial fibres is
(a) melamine
(b) nylon-6, 6
(c) polyacrylonitrile
(d) buna-N.
Answer. C

Question. Regarding cross-linked or network polymers, which of the following statements is incorrect?
(a) They contain covalent bonds between various linear polymer chains.
(b) They are formed from bi- and tri-functional monomers.
(c) Examples are bakelite and melamine.
(d) They contain strong covalent bonds in their polymer chains.
Answer. D

Question. Natural rubber has
(a) alternate cis- and trans-configuration
(b) random cis- and trans-configuration
(c) all cis-configuration
(d) all trans-configuration. 
Answer. C

Question. Caprolactam is used for the manufacture of
(a) teflon
(b) terylene
(c) nylon 6, 6
(d) nylon 6.
Answer. D

Question. Which of the following organic compounds polymerizes to form the polyester dacron?
(a) Propylene and para HO—(C₆H₄)—OH
(b) Benzoic acid and ethanol
(c) Terephthalic acid and ethylene glycol
(d) Benzoic acid and para HO—(C₆H₄)—OH
Answer. C

Question. Nylon is an example of
(a) polyamide
(b) polythene
(c) polyester
(d) polysaccharide.
Answer. A

Question. Which one of the following is not a condensation polymer?
(a) Melamine
(b) Glyptal
(c) Dacron
(d) Neoprene 
Answer. D

Question. Which of the following statements is false?
(a) Artificial silk is derived from cellulose.
(b) Nylon-6,6 is an example of elastomer.
(c) The repeat unit in natural rubber is isoprene.
(d) Both starch and cellulose are polymers of glucose. 
Answer. B

Question. Of the following which one is classified as polyester polymer?
(a) Terylene
(b) Bakelite
(c) Melamine
(d) Nylon-6,6
Answer. A

Question. Which one of the following statements is not true?
(a) Buna-S is a copolymer of butadiene and styrene.
(b) Natural rubber is a 1,4-polymer of isoprene.
(c) In vulcanization, the formation of sulphur bridges between different chains make rubber harder and stronger.
(d) Natural rubber has the trans-configuration at every double bond. 
Answer. D

Question. Which one of the following polymers is prepared by condensation polymerisation?
(a) Teflon
(b) Natural rubber
(c) Styrene
(d) Nylon-6,6
Answer. D

Question. Which one of the following is a chain growth polymer?
(a) Starch
(b) Nucleic acid
(c) Polystyrene
(d) Protein
Answer. C

Question. Which compound forms linear polymer due to H-bond?
(a) H₂O
(b) NH₃
(c) HF
(d) HCl 
Answer. C

Question. Natural rubber is a polymer of
(a) styrene
(b) ethyne
(c) butadiene
(d) isoprene.
Answer. D

Question. Terylene is a condensation polymer of ethylene glycol and
(a) salicylic acid
(b) phthalic acid
(c) benzoic acid
(d) terephthalic acid. 
Answer. D

Question. Which one of the following is used to make ‘nonstick’ cookware?
(a) Polyethylene terephthalate
(b) Polytetrafluoroethylene
(c) PVC
(d) Polystyrene 
Answer. B

Question. The bakelite is prepared by the reaction between
(a) phenol and formaldehyde
(b) tetramethylene glycol
(c) urea and formaldehyde
(d) ethylene glycol. 
Answer. A

Question. The biodegradable polymer is
(a) buna-S
(b) nylon-6,6
(c) nylon-2-nylon 6
(d) nylon-6
Answer. C

1. Differentiate between:

a. Low density polythene and high density polythene

b. DNA and RNA

c. Nuleoside and Nucleotide

d. Antacids and Antihistamines

e. Disinfectants and antiseptics

f. Agonists and antagonists

g. Elastomers and fibres

2. Write one example each:

a. Broad spectrum antibiotics

b. Artificial sweetening agents

c. Cationic detergents

d. Essential amino acid

e. Source of vitamin B

f. Deficiency disease caused by vitamin C

g. Biodegradable polymer

h. Thermosetting polymer

3. Explain Why?

a. Soaps do not work in hard water

b. Aspirin though an analgesic is given to people suffering from hypertension/cardiac arrests

c. Use of aspartame is limited to cold drinks

ONE MARK QUESTIONS

1.How does vulcanization change the property of rubber?

2.Explain the term ‘homopolymerisation’ giving an example. (2012)

TWO MARK QUESTIONS

1.What is PHBV? Give its importance.

2.Explain the term copolymerization and give two examples.

3.Give chemical equations for the preparation of (a) PHBV (b) Melamine

4.Differentiate between molecular structure and behaviours of thermoplastic and thermosetting polymers. Give one example of each type. (2012)

THREE MARK QUESTIONS

1.Arrange the following polymers in the increasing order of their intermolecular forces. Also classify them as addition and condensation polymers.

a) Nylon 6, 6 ; Buna –S , rubber , Polystyrene.

b) Nylon – 6, neoprene and PVC

c) Polystyrene, terylene, natural rubber (2013)

2.Explain the classification of polymers on the basis of structure?

3.Write the free radical mechanism for the polymerisation of ethene.

4.Give equations for the synthesis of

a) Terylene

b) Neoprene

c) Teflon (2011)

5.Write the (i) and (ii) use of each of the following polymers:(2010)

a) PVC

b) Urea – formaldehyde resin

c) Bakelite

FIVE MARK QUESTIONS

1.Differentiate between:

a) Thermosetting and thermoplastics.

b) Addition and condensation polymers

c) LDP and HDP

d) Nylon-6 and Nylon-6,6

e) Homo-polymer and co-polymer

VALUE BASED QUESTION

1.A large number of polymers are resistant to the environmental degradation and therefore they are responsible for the pollution due to their accumulation in the environment. Polythene which we use daily as carry bags is also one such polymer.

a) How can you as a responsible individual avoid the environmental degradation due to these polymers especially polythene?

b) What is biodegradable polymer? Give an example of biodegradable polymer.

c) Write a short note on aliphatic polyesters.

d) Write the values associated with the paragraph and biodegradable polymers.

Question. Give the name and structure of reagent usedfor initiating a free radicalchainreaction .
Answer : Name- benzoylperoxide ,C₆H₅-CO-O-O-CO-H₅C₆

Question. Classify them as addition and condensation polymers:Nylon-66,Buna-s,polythene,terylene
Answer : Additionpolymer:Polythene and Buna-s,Condensationpolymer:Nylon-66,terylene

Question. Give name and structure of monomer present in natural rubber.
Answer : Name:Isoprene(2-Methyl1,3-Butadiene) ,Structure:CH₂=C(CH₃) CH=CH₂

Question. What is biodegradeablepolymers?Give one example
Answer : PHBV

Question. What is polymers?
Answer : Polymers are high molecularmass substances consisting of large no of repeating structural units.

Question. How are the polymer classified on the basis of structure:
Answer : a) Linear Polymer b) Branched chain polymers c) Cross linked polymers

Question. Writes the names of monomer of the following (-CO-(CH₂) 5-NH-) n
Answer : Caprolactum

Question. Arrange the following polymers in increasing order of their intermolecular forces: Nylon6, Neoprene, polyvinyl chloride.
Answer : Neoprene<Polyvinyl chloride<Nylon-6 

Question. Is (-NH-CHR-Co-) n is a homopolymer or copolymer?
Answer : Homopolymer

Question. What is vulcanized rubber?
Answer : process of heating a mixture of natural rubber with sulphur is called vulcanized rubber.

Question. Write the monomer of Bakelite.
Answer : Phenol and formaldehyde

Question. Menton two uses of Bakelite.
Answer : It is used for making combs,electrical switches and handle of various utensils

Question. Explain the term copolymer and give two examples.
Answer : Polymer which are made up of two different monomer unit are called copolymers: eg.Buna-N,Buna-S (CH-15)

Question. Mention one use of melamine?
Answer : It is used in the manufacture of unbreakable crockery.

Question. How can natural rubber be made more tough?
Answer : By the process of vulcanization with sulphur.

Question. What is natural rubber?
Answer : It is a cis 1,4-polyisoprene.

Question. How do you explain functionality of monomer?
Answer : No of bonding sites in monomers.

Question. What are natural polymers?
Answer : Those polymers which are obtained mostly from plants and animals are called natural polymers eg Natural rubber,cellulose

Question. What is synthetic polymers?
Answer : Those polymer which are obtained from chemical compound are called synthetic polymer

Question. What is monomer of Nylon-2-Nylon-6?
Answer : Glycine,6-Aminocaproic acid.

Two marks questions on polymer

Question. Explain the difference between Buna-N and Buna-s.
Answer : Buna-Nis a polymer of 1,3-Butadiene and andacrylonitrile and buna-s is a polymer of 1,3-Butadiene and styrene.

Question. Distinguish between homopolymer and copolymer?
Answer : Homopolymer is made up of only one type of monomer unit eg. PVC. Where as co-polymer is made up of two different monomer units eg Buna-s.

Question. What are polyamides and polyesters?Give one example of each.
Answer : Polymers having amide linkage in the chain are called polyamides eg Nylon-6.Polymers having ester linkage in the chain are called polyesters eg. Terylene.

Question. Dicuss the main purpose of vulcanization.
Answer : Natural rubberbecome soft at high temperature,Brittle at low temperature.And show higher water absorption capacity. It is nonresistant to attack by oxidizing agent .In order to improve these properties a process of vulcanization is carried out.

Question. In which classes, the polymers are classified on the basis of molecular forces?
Answer : Elastomer, fibre ,thermoplastics and thermosetting polymers.

Question. Write names of monomers of the following polymers.
a) (-CF^2-CF^2-) n b) (CH^2-CH(cl)^-) n.
Answer : a) Tetrafluoroethene b) Vinyl chloride .

Question. what are monomeric repeating units of nylon-6 and nylon-6,6 ?
Answer : Caprolactam , Hexamethylenediamine and Adipic acid

Question. Arrange the following polymers in increasing order of their intermolecular forces.
a) nylon-6 ,6 ,Buna-S , Polythene
b) Neoprene, Nylon-6, PVC
Answer : a) BUNA-S< Polythene <Nylon-6,6
b) Neoprene < PVC < nylon-6

Question. Classify the following as Addition and condensation polymers: Bakelite,melamine,PVC,Buna-S,Buna-N,Nylon-6,6
Answer : Additionpolymers:Buna-N,Buna-S,PVC
Condensation polymer:Nylon-6,6,Bakelite melamine,

Question. How is novolac converted into bakelite?
Answer : Novolac on heating with formaldehyde undergoes crosslinking to form an infusible solid mass called Bakelite.

Question. Differentiate between Addition and condensation polymers.
Answer : Addition polymer:1) It takes place in unsaturated monomers.
2) Loss of small molecule like water and ammonia does not take place.

Two marks questions,Polymer

Condensation polymer: 1) It takes place in monomers having multi functional groups .2) Loss of small molecules like water and ammonia takes place.

Question. Differentiate between thermoplastic and thermosetting polymer.
Answer : Those polymers which are remoulded into our desire shape on heating and cooling are called thermoplastic.eg.PVC,Teflon
Those polymers which are not re mouded into our desire shape on heating and cooling are called thermoplastic.eg.Bakelite,Melamine.

Question. How is Dacron obtained?
Answer : Dacron is obtained by the condensation of ethylene glycol and terephthalic acid.

Question. Give the synthesis of a) Neoprene b) Teflon.
Answer : (a) n CH₂=C (cl) -CH=CH₂ -------(CH₂-C(cl) =CH-CH₂) n
(b) n(CF₂=CF₂) --------------(-CF₂-CF₂) n

Question. What do you mean by nylon-6,6?
Answer : Nylon6,6 is a condensation polymer and is made up of two different monomer units ie,hexamethylenediamine and adipic acid.

Three marks questions on polymer

Question. How does the presence of double bond in rubber molecule influence their structure and reactivity?
Answer : The natural rubber is a linear1,4-polyisoprene.Double bonds are located between C-2 and C-3 of isoprene units.This configuration about double bond do not allow the chains to come closer for effective attraction due to weak intermolecular forces of attraction.That is why natural rubber has a coiled structure and shows elasticity.

Question. Arrange the following polymers in increasing order of their nter molecular forces.
a) PVC,Naturalrubber,Terylene,
b) Nylon-6,6,Neoprene,PVC
c) Nylon6,Buna-N,Teflon
Answer : a) Natural rubber<PVC<Terylene
b) Neoprene<PVC<Nylon6,6
c) Buna-N<Teflon<nylon6

Question. Write the names of monomers used f0r getting the following polymers.
a) PVC
b) Teflon
c) bakelite
d) Neoprene
e) Polyacrylonitrile
f) Buna-S
Answer : a) Vinyl chloride b) Tetrafluoroethene c) Phenol and formaldehyde
d) 2-chloro 1,3-butadiene,e) Acrylonitrile,f) 1,3 Butadiene and styrene

Question. Classify the following as addition and condensation polymer:PHBV,Dacron,Teflon,neoprene,PVC,Bakelite
Answer : Addition polymer:Teflon,PVC,Neoprene
Condensation polymer:PHBV,Bakelite,Dacron

Question. Discuss and classify the polymers on the basis of inter molecular forces.
Answer : 1) Elastomer: Weakest intermolecular forces eg.Buna-N,Buna-S
2.Fibre; Strong intermolecular force like hydrogen bond eg Nylon-66
3. Thermoplastic;No cross linkage eg PVC
4. Thermosetting Polymer; numerous cross linkage egBakelite

1 MARK QUESTIONS

1. What are polymers?

2. What do you mean by the term polyamides?

3. Give examples of semisynthetic polymers?

4. What are copolymers?

5. What are elastomers?

6. What are biodegradable polymers?

7. Mention one use of Buna-S.

8. Name the monomers of natural rubber.

9. Name the polymer used for making unbreakable crockery.

10. Name the polymer which is used for making non- stick utensils.

2 MARKS QUESTIONS

11. What is meant by polymerization? What type of polymer is Teflon and what is its chief use?

12. Give the classification of polymers based on molecular forces.

13. Give the classification of polymers based on structure.

14. Arrange the following polymers in the increasing order of their intermolecular forces. Also classify them as addition and condensation polymers: Nylon-6 , Neoprene , PVC.

15. Why do the densities of low density polythene and high density polythene differ?

16. Could a copolymer be formed in both addition and condensation polymerization or not? Explain with examples.

17. What is vulcanization of rubber?

18. Give three differences between linear polymers and branched- chain.