CBSE Class 12 Chemistry Polymers Worksheet Set 01

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

Question: The molecular mass of polymer is in the range of
a) 10¹⁰-10¹⁵u
b) 10³-10⁷u
c) 10⁶-10¹⁸u
d) 10¹-10³u

Answer: b

Question: Polymer which contains strong intermolecular forces, e.g. hydrogen bonding is
a) polystyrene
b) nylon-6,6
c) teflon
d) natural rubber

Answer: b

Question: PVC is a
a) linear polymer
b) branched polymer
c) cross-linked polymer
d) None of these

Answer: a

Question: To which category of polymers, cellulose derivatives belong to?
a) Synthetic polymers
b) Semi-synthetic polymers
c) Natural polymers
d) Branched polymers

Answer: b

Question: Buna-S is a
a) natural polymer
b) synthetic polymer
c) semi-synthetic polymer
d) None of these

Answer: b

Question: What is full form of HDP?
a) High density polythelene
b) High density polythene
c) High density polypropene
d) High density polypropylene

Answer: b

Question: Which one of the following is a network polymer?
a) HDP
b) Bakelite
c) LDP
d) Polyvinyl chloride

Answer: b

Question: Rubber like solids with elastic properties are called
a) elastomers
b) fibres
c) thermosetting polymers
d) thermoplastic polymers

Answer: a

Question: Polymers containing linear chains having some branches are known as
a) network polymers
b) branched polymers
c) linear polymers
d) cross-linked polymers

Answer: b

Question: The repeated addition of same monomer molecules having double or triple bonds is known as
a) copolymer
b) elastomer
c) homopolymer
d) fibre

Answer: c

Question: Buna-S is a copolymer of
a) ethene and styrene
b) 1, 3-butadiene and ethene
c) 1, 3-butadiene and styrene
d) ethene and propene

Answer: c

Question: Low density polythene is obtained through
a) electrophilic addition
b) free radical addition
c) nucleophilic addition
d) nucleophilic substitution

Answer: b

Question: The type of polythene which is chemically inert and more tough and hard is
a) HDP
b) LDP
c) Both (a) and (b)
d) None of these

Answer: a

Question: Nylon is an example of
a) polyester
b) polysaccharide
c) polyamide
d) polythene

Answer: c

Question: LDP is used in the insulation of electricity wires and manufacture of flexible pipes because
a) it is chemically inert
b) it is tough and flexible
c) it is poor conductor of electricity
d) All of the above

Answer: c

Question: The monomers of dacron, a polyester is/are
a) ethylene glycol
b) terephthalic acid
c) caprolactam
d) Both (a) and (b)

Answer: d

Question: Among the following polymers, the phenol formaldehyde resin is
a) teflon
b) bakelite
c) melamine
d) buna-N

Answer: b

Question: The commercial name of polyacrylonitrile is
a) orlon (acrilan)
b) dacron
c) bakelite
d) melamine

Answer: a

Question: In natural rubber, few cross-links are introduced in between the chains. These chains help to
a) make the rubber soft
b) retract the original position after the force is released
c) make the rubber hard
d) None of the above

Answer: b

Question: Among the following, which polymer is used for making combs, electrical switches, handles of utensils and computer discs?
a) Bakelite
b) Glyptal
c) Polystyrene
d) PVC

Answer: a

Question: Which polymer has ‘chiral’ monomer(s)?
a) PHBV
b) Buna-N
c) Nylon-6, 6
d) Neoprene

Answer: a

Question: Preparation of bakelite proceeds via reactions
a) electrophilic addition and dehydration
b) condensation and elimination
c) nucleophilic addition and dehydration
d) electrophilic substitution and dehydration

Answer: d

Question: Biodegradable polymer which can be produced from glycine and amino caproic acid is
a) nylon-2-nylon-6
b) PHBV
c) buna-N
d) nylon-6, 6

Answer: a

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.

Classification of Polymers

Question. Identify the odd one out: Buna-S, Buna-N, Neoprene, Polyesters (on the basis of molecular forces).
Answer: Polyesters. Polyesters are fibres having strong intermolecular forces (like hydrogen bonding/dipole-dipole), whereas Buna-S, Buna-N, and Neoprene are elastomers which have very weak intermolecular forces.

Question. Identify the odd one out: Protein, Starch, Cellulose, Nylon-6 (on the basis of source of formation).
Answer: Nylon-6. Nylon-6 is a synthetic (man-made) polymer, whereas Protein, Starch, and Cellulose are naturally occurring polymers.

Question. Identify the odd one out: Polythene, Teflon, Polystyrene, Nylon-6 (on the basis of mode of polymerization).
Answer: Nylon-6. Nylon-6 is a condensation/ring-opening polymer, whereas Polythene, Teflon, and Polystyrene are addition polymers.

Question. Identify the odd one out: Polythene, Polystyrene, Polyvinyls, Bakelite (on the basis of thermoplastic/thermosetting polymers).
Answer: Bakelite. Bakelite is a thermosetting polymer, whereas Polythene, Polystyrene, and Polyvinyls are thermoplastic polymers.

Question. Match the following:
Column A
(1) Co-polymers
(2) Homo-Polymers
(3) Thermoplastics
(4) Thermosettings

Column B
(a) Bakelite
(b) Teflon
(c) Buna-S
(d) PVC

Answer: (1) - (c) Buna-S, (2) - (b) Teflon, (3) - (d) PVC, (4) - (a) Bakelite

Question. Fill in the blanks:
1. Linear polymers: PVC ; Cross linked polymers: ___________
2. Fibres: Polyesters ; Thermosetting: ___________
3. Addition polymers: ___________ ; Condensation Polymers: Terylene
4. Polyamides: Nylon-6,6 ; Polyesters: ___________

Answer:
1. Bakelite (or Melamine-formaldehyde)
2. Bakelite (or Melamine-formaldehyde)
3. Polythene (or Teflon / PVC / Buna-S)
4. Terylene (or Glyptal)

Question. Match the following:
Column A
(1) HDPE
(2) PHBV
(3) Natural rubber
(4) Poly amides

Column B
(a) Condensation polymers
(b) Isoprene
(c) Bio degradable
(d) Ziegler-Natta Catalyst

Answer: (1) - (d) Ziegler-Natta Catalyst, (2) - (c) Bio degradable, (3) - (b) Isoprene, (4) - (a) Condensation polymers

Question. State whether the following statements are True or False:
1. Buna-N is an addition polymer.
2. Polythene is a fibre.
3. Orlon is a homopolymer.
4. Melamine-formaldehyde is not a condensation polymer.

Answer:
1. True
2. False (It is a thermoplastic)
3. True (Homopolymer of acrylonitrile)
4. False (It is a condensation polymer)

Question. State whether the following statements are True or False:
1. PHBV is a bio-degradable polymer.
2. Benzoyl peroxide is used as an initiator in polymerisation.
3. Chlorine is used for vulcanization of rubber.
4. Fibres are having high tensile strength.

Answer:
1. True
2. True
3. False (Sulphur is used)
4. True

Uses of Polymers

Question. Match the following:
Column A
(1) Teflon
(2) Bakelite
(3) BUNA-N
(4) Melamine-formaldehyde

Column B
(a) Unbreakable Crockery
(b) Oil Seals, tank lining
(c) Electrical switches
(d) Non-stick utensils

Answer: (1) - (d) Non-stick utensils, (2) - (c) Electrical switches, (3) - (b) Oil Seals, tank lining, (4) - (a) Unbreakable Crockery

Question. Match the following:
Column A
(1) BUNA-S
(2) Polyethene
(3) PVC
(4) PHBV

Column B
(a) Specialty Packaging
(b) Rain coats, hand bags
(c) Insulators
(d) Automobile tyres

Answer: (1) - (d) Automobile tyres, (2) - (c) Insulators, (3) - (b) Rain coats, hand bags, (4) - (a) Specialty Packaging

Question. Fill in the blanks:
1. ___________ is used in glass reinforcing material in safety helmets.
2. ___________ is used for making auto tyres, floortiles, cable insulation, etc.
3. ___________ is used for making combs, phonograph records, electrical switches, etc.
4. ___________ is used for making conveyor belts, gaskets, etc.

Answer:
1. Terylene (or Dacron)
2. Polystyrene (or Buna-S)
3. Bakelite
4. Neoprene

Question. Fill in the blanks:
1. Heating a mixture of raw rubber with sulphur and appropriate additive is called ___________.
2. 5 % Sulphur is used as a cross linking agent in the manufacture of ___________.
3. ___________ is used for the making of Paints and lacquers.
4. ___________ is used for making ropes, toys, pipes, etc.

Answer:
1. Vulcanisation
2. Tyre rubber
3. Glyptal
4. Polyethene (or PVC)

Question. State whether the following statements are True or False:
1. Bakelite is used in the manufacture of unbreakable cups.
2. HDPE is used for manufacturing buckets, dustbins & pipes.
3. PAN is used as a substitute for wool in making commercial fiber as Orlon/acrylon.
4. Nylon -6 is not used for making tyre cords & fabrics.

Answer:
1. False (Melamine-formaldehyde is used)
2. True
3. True
4. False (It is commonly used for tyre cords and fabrics)

Question. State whether the following statements are True or False:
1. Polystyrene is a copolymer as well as addition polymer.
2. HDPE is an addition as well as thermoplastic.
3. Condensation polymerization is otherwise called Chain growth polymer.
4. Novolac is used in Paints.

Answer:
1. False (It is an addition homopolymer)
2. True
3. False (It is step growth polymerization)
4. True

Preparation of Polymers

Question. Match the polymers with their correct monomers and major uses:
1. Polythene
2. Teflon (Polytetrafluoroethene)
3. Buna-S
4. Buna-N

Answer:
1. Polythene: Monomer is Ethene (\( \text{CH}_2=\text{CH}_2 \)); Used for making ropes, toys, pipes, squeeze bottles.
2. Teflon: Monomer is Tetrafluoroethene (\( \text{CF}_2=\text{CF}_2 \)); Used for oil seals, gaskets, and non-stick cooking ware.
3. Buna-S: Monomers are Buta-1,3-diene (\( \text{CH}_2=\text{CH}-\text{CH}=\text{CH}_2 \)) and Styrene (\( \text{C}_6\text{H}_5\text{CH}=\text{CH}_2 \)); Used for automobile tyres, footwear, and cable insulation.
4. Buna-N: Monomers are Buta-1,3-diene (\( \text{CH}_2=\text{CH}-\text{CH}=\text{CH}_2 \)) and Acrylonitrile (\( \text{CH}_2=\text{CH}-\text{CN} \)); Used for oil seals, gaskets, and tank linings.

Question. Match the polymers with their correct monomers:
1. Nylon 6,6
2. Nylon 6
3. Bakelite
4. Melamine polymer
5. PHBV
6. Nylon 2–Nylon 6
7. Terylene (Dacron)

Answer:
1. Nylon 6,6: Hexamethylene diamine (\( \text{NH}_2(\text{CH}_2)_6\text{NH}_2 \)) + Adipic acid (\( \text{HOOC}(\text{CH}_2)_4\text{COOH} \))
2. Nylon 6: Caprolactam
3. Bakelite: Phenol + Methanal (Formaldehyde)
4. Melamine polymer: Melamine + Methanal (Formaldehyde)
5. PHBV: 3-Hydroxybutanoic acid + 3-Hydroxypentanoic acid
6. Nylon 2–Nylon 6: Glycine (\( \text{H}_2\text{N-CH}_2\text{-COOH} \)) + Amino caproic acid (\( \text{H}_2\text{N-(CH}_2)_5\text{-COOH} \))
7. Terylene (Dacron): Ethane-1,2-diol (Ethylene glycol) + Benzene-1,4-dicarboxylic acid (Terephthalic acid)

Question. Fill in the blanks:
1. Ethene is monomer unit for the preparation of _______________. (PVC/polythene)
2. Hexamethylene diamine + ___________ are used to prepare Nylon 66. (Adipic acid/ Lactic acid)
3. Ziegler Natta catalyst is used for the synthesis of _______________. (HDP/LDP)
4. PHBV is an example of _______________ polymer. (Biodegradable/ Non-Biodegradable)
5. Dacron/terylene are the best example of ___________ (Polyamides/Polyesters)
6. Phthallic acid and ethylene glycol are the monomers of ___________. (Glyptal/Dacron)

Answer:
1. polythene
2. Adipic acid
3. HDP
4. Biodegradable
5. Polyesters
6. Glyptal

Question. Identify the polymer from the chemical structure:

\[ \text{1. } \left( \text{CH}_2-\text{CH}=\text{CH}-\text{CH}_2-\text{CH}_2-\text{CH}(\text{C}_6\text{H}_5) \right)_n \]
\[ \text{2. } \left( \text{OCH}_2-\text{CH}_2-\text{O}-\text{CO}-\text{C}_6\text{H}_4-\text{CO} \right)_n \]
\[ \text{3. } \left( \text{NH}-(\text{CH}_2)_6-\text{NH}-\text{CO}-(\text{CH}_2)_4-\text{CO} \right)_n \]

Answer:
1. Buna-S
2. Terylene (Dacron)
3. Nylon-66

Question. Identify the monomers from the given polymer structures:

\[ \text{1. } \left( \text{CH}_2-\text{C(Cl)}=\text{CH}-\text{CH}_2 \right)_n \]
\[ \text{2. } \left( \text{NH}-(\text{CH}_2)_6-\text{NH}-\text{CO}-(\text{CH}_2)_4-\text{CO} \right)_n \]
\[ \text{3. } \left( \text{CH}_2-\text{CH}=\text{CH}-\text{CH}_2-\text{CH}_2-\text{CH(CN)} \right)_n \]
\[ \text{4. } \left( \text{OCH}_2-\text{CH}_2-\text{O}-\text{CO}-\text{C}_6\text{H}_4-\text{CO} \right)_n \]

Answer:
1. Chloroprene (2-chloro-1,3-butadiene)
2. Hexamethylene diamine and Adipic acid
3. 1,3-Butadiene and Acrylonitrile
4. Ethylene glycol and Terephthalic acid