Based on the chapter Polymers, some of the important questions are prepared in this question paper. It covers one mark, two and five marks questions from the book back and PTA question.
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Questions:

1 Marks

3 x 1 = 3

Name the polymers used in laminated sheets and give the name of monomeric unit involved in its formation.

What is the repeating structural unit in polythene polymer ?

Define the term 'polymerisation'.

Generic 2

6 x 2 = 12

How is nylon 6,6 synthesized?Write the names and structures of its monomer units.

Differentiate between thermoplastic and thermosetting polymers.Give one example of each

What is the primary feature necessary for a monomer to make it useful in a condensation polymerization reaction?

Draw the molecular structures of the monomers of
(i) PVC
(ii) Teflon

Explain the term copolymerisation and give two examples.

What are polymers ?

Generic 3

4 x 3 = 12

10.

Differentiate between the modes of formation of an addition polymer and a condensation polymer. Give one example of each of these formations.

11.

Distinguish between addition polymers and condensation polymers. Classify the following into addition and condensation polymers:
(a) Polythene
(b) PTFE
(c) Polybutadiene
(d) Bakelite

12.

Mention two important uses of each of the following polymers :
(i) Bakelite
(ii) Nylon 6,6
(iii) PVC

13.

What are biodegradable polymers ? Give an example of such a polymer and mention its uses.

Multiple Choice Question

10 x 1 = 10

14.

Which of the following are biodegradable polymers?

(a)

Nylon-6,6

(b)

PHBV

(c)

Nylon-2-Nylon-6

(d)

Polychloroprene

15.

Which of the following are addition homopolymers?

(a)

Teflon

(b)

SBR

(c)

PVC

(d)

Natural rubber

16.

Soft drinks and baby feeding bottles are generally made up of

(a)

Polyester

(b)

Polyurethane

(c)

Polystyrene

(d)

Polyamide

17.

Which of the following 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

18.

Which of the following polymers can have strong intermolecular forces?

(a)

Nylon

(b)

Polystyrene

(c)

Rubber

(d)

Polyesters

19.

Which of the following are characteristics of thermosetting polymers?

(a)

Heavily branched cross linked polymers

(b)

Linear slightly branched long chain molecules

(c)

Become infusible on moulding so cannot be reused

(d)

Soften on heating and cooling,can be reused

20.

Which of the following is not a semisynthetic polymer?

(a)

cis-Polyisoprene

(b)

Cellulose nitrate

(c)

Cellulose acetate

(d)

Vulcanised rubber

21.

Bakelite is a polymer of

(a)

benzaldehyde and phenol

(b)

formaldehyde and phenol

(c)

formaldehyde and benzyl alcohol

(d)

acetaldehyde and phenol

22.

Which of the following is a step-growth polymer?

(a)

Polyacrylonitrile

(b)

Polyisoprene

(c)

Nylon

(d)

Polythene

23.

Which of the following is a linear polymer?

(a)

Nylon

(b)

Bakelite

(c)

Low density polythene

(d)

Melamine - formaldehyde polymer

Generic 5

2 x 5 = 10

24.

Formaldehyde is a constituent of a number of polymers also called resins. These are non-volatile solids or semi-solids which are obtained from certain plants and also be synthesized in the laboratory.
(i) Name the main formaldehyde resins.
(ii) Mention the major components of these resins also called polymers.
(iii) Which out of these is useful in the manufacture of crockery?
(iv) Formaldehyde is obtained from plants. Similarly we obtain many useful things from plants. Is it worth to destroy plants for obtaining useful material ?

25.

What is nylon?Write an equation for the chemistry involved contain alternate monomers of each type.What is the weight percent of ethylene in this copolymer.

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Answers Key:

1 Marks

3 x 1 = 3

()
The polymer is urea-formaldehyde resin
Monomers: Urea: Na₂CONH₂
Formaldehyde: HCHO

()
\((-{ CH }_{ 2 }-{ CH }_{ 2 }-)_{ n }\)

()
It is process in which large number of small molecules combine under specific conditions of T, P and catalyst to form large molecule called polymer.

Generic 2

6 x 2 = 12

Adipic acid, HOOC(CH₂)₄COOH and hexamethylenediamine, H₂N(CH₂)6NH₂ .By condensation polymerization of adipic acid and hexamethylenediamine at 525 K.

Thermoplastic	Thermosetting
1. These can be softened repeatedly by heating and can be remoulded without any change in their properties.	1. These cannot be softened on heating and cannot be remoulded
2. Example: Polythene	2. Example: Bakelite

The primary feature necessary for monomer units to undergo condensation polymerization is that each monomer unit must have two or three functional groups. For example, the monomers of polyester are: terephthatic acid and ethylene glycol each of which has two functional groups - terephthalic acid has two -COOH groups while ethylene glycol has two -OH groups
In contrast, glypal polymer can be obtained by condensation of phthalic acid or its anhydride with either ethylene glycol which has two -OH groups or glycerol which has three -OH groups.

(i) CH₂=CH-Cl is monomer of PVC.
(ii) CF₂=CF₂ is monomer of Teflon.

The process of forming polymers from two or more different monomeric units is called copolymerization. Multiple units of each monomer are present in a copolymer. The process of forming polymer Buna-S from 1, 3-butadiene and styrene is an example of copolymerization.

Those molecules which are formed from large number of small molecules (monomers) under specific conditions of temperature and pressure are called polymers.

Generic 3

4 x 3 = 12

10.

Condensation polymerisation	Addition polymerisation
1. It is formed by combination of large number of monomers having multifunctional groups to form polymers with loss of small molecules like H₂O, NH₃, etc.	1. It is formed by addition reaction of large number of monomers having double bond without any loss of small molecules.
2. It is step growth polymerisation, e.g. Nylon-66.	2. It is chain growth polymerisation, e.g. Polythene.

11.

Addition Polymerisation	Condensation Polymerisation
1. It takes place in unsaturated monomers.	1. It takes place in monomers having multi-functional groups
2. Loss of small molecules like H₂O, NH₃, NaCl etc., does not take place.	2. Loss of small molecules like H₂O, NH₃, NaCl will take place.

Addition Polymers : Polythene, PTFE, Polybutadiene
Condensation Polymer : Bakrlite

12.

(i) Bakelite :
(a) It is used as making electrical switches.(b) It is used for making switch boards.
(ii) Nylon 6 :
(a) It is used in tyre cords. (b) It is used as making ropes and fabrics
(iii) PVC :
(a) It is used in making hose pipes (b) It is used for insulation of electric wires.

13.

Biodegradable polymers: Those polymers which are biodegradable, i.e. decomposed by microorganisms and do not create water pollution, e.g. PHBV.
Poly (Glycolic acid) and Poly (Lactic acid) are biodegradable polymers such as sutures.Dextron was the first bioabsorbable suture made from biodegradable polyester for post operative stiches

Multiple Choice Question

10 x 1 = 10

14.

15.

SBR (styrene-butadiene rubber) is an addition copolymer.

16.

17.

Nylon-6,6 is an example of elastomer

18.

(d)
Polyesters

19.

(a)
Heavily branched cross linked polymers

20.

cis-Polyisoprene is a natural rubber.

21.

(b)
formaldehyde and phenol

22.

23.

(a)
Nylon

Generic 5

2 x 5 = 10

24.

(i) Main formaldehyde resins: Bakelite, melamine formaldehyde and urea Formaldehyde.
(ii) Bakelite: Phenol and formaldehyde.
Melamine formaldehyde: Melamine and formaldehyde.
Urea formaldehyde: Urea and formaldehyde.
(iii) Melamine is used for this purpose.
(iv) In the modern world, polymer industry has a major role. No doubt, natural polymers are also useful but synthetic polymers have an impact on most of our daily house hold necessity items. It may range from kitchen, bed room and also all luxury items. But it is not worth to destroy plants as they are life giving.

25.

The (-CO-NH-) in nylon gets hydrolysed