Chemistry

Polymers and Plastics

1,227 Questions

Polymers and plastics questions explore the properties, synthesis, and applications of various synthetic and natural polymers. Key topics include biodegradable plastics, vulcanization, and polymer nanocomposites. These concepts are frequently tested in science and engineering competitive exams.

Biodegradable plasticsPolymer nanocompositesVulcanization of rubberPolymer molecular weightAsphalt binders

Polymers and Plastics Questions

Multiple choice chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

Which of the following polymer form net like structure ?

  1. Butyl rubber

  2. Polythene

  3. Polystyrene

  4. Melamine
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Thermosetting polymers have a net-like structure because of the presence of cross-links between different polymeric chains. Among the given only melanin polymer is a thermosetting polymer, so it has a net-like structure. 


Note: Butyl rubber is a Westerner whereas polythene and polystyrene we thermoplastics.

Multiple choice chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

Which of the following is/are true statement(s) for the preparation of Teflon?

  1. It is produced by condensation polymerization

  2. Water acts as catalyst

  3. The monomer used is tetrafluoroethane

  4. The monomer is obtained from carbon tetrachloride
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

 It is produced by addition polymerization. Water acts as a catalyst. The monomer used is tetrafluoroethylene. It is obtained from chloroform.


The option (B) represents a true statement for the preparation of Teflon.

Multiple choice chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

STATEMENT-1 : PMMA (Polymethyl methacrylate) is used for making lenses and light covers.
STATEMENT-2 : It has excellent light transmission properties.

  1. STATEMENT-1 is True, STATEMENT-2 is True, STATEMENT-2 is a correct explanation for STATEMENT-1

  2. STATEMENT-1 is True, STATEMENT-2 is True, STATEMENT-2 is NOT a correct explanation for STATEMENT-1

  3. STATEMENT-1 is True, STATEMENT-2 is False

  4. STATEMENT-1 is False, STATEMENT-2 is True
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

PMMA (polymethyl methacrylate) is a widely commercially used bio-degradable polymer. It has excellent light transmission properties, due to which it is used for making lenses and light covers. 

Multiple choice chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

List-l                         List-ll                                    
A)Rayon                   1)$CH _{2}O+C _{6}H _{5}OH$


B)Silicone polymers  2) $F _{2}C= CF _{2}$
 
                                             R
                                              |
C) Bakelite              3)  HO-Si-OH
                                              |
                                              R
D) Teflon                     4)Cellulose

  1. A-4 B-3 C-1 D-2

  2. A- 1 B-3 C-2 D-4

  3. A-4 B-2 C-3 D-1

  4. A-2 B-4 C-3 D-1
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

(A) Rayon:- Cellulose, organic polymer


(B) Silicone polymers consist of Si atom. Thus option 2.

(C) Bakelite:- condensation polymer formed by phenol and formaldehyde network structure


(D) Teflon:- Tetrafluoro ethene get polymerize forming teflon

A-4, B-3, C-1, D-2

Multiple choice chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

A: Polymethyl methacrylate is also known as plexi glass.
R: PMMA is used in decorative articles.

  1. Both A and R are correct and R is the correct explanation of the A

  2. Both A and R are correct but R is not the correct explanation of the A

  3. A is correct but R is in correct

  4. A is incorrect but R is correct
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Polymethyl methacrylate is also known as plexi glass.
PMMA is polymethyl methaacrylate. It is an addition hopolymer of methyl methacrylate ($\displaystyle CH _2 =C(CH _3)COOCH _3 $).
PMMA is used in decorative articles, lenses, sign borads and aircraft windows.

Multiple choice chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

List - I                                       List - II
A) Polystyrene                        p) Condensation polymer
B) Polythene                           q) Thermoplastic polymer
C) Nylon- $6, :6$                        r) Polyamide
D) Terylene                             s) Addition polymer

  1. (a - q,s), (b - q,s), (c - p,q,r), (d - p)

  2. (a - p), (b - s), (c - p,r), (d - p,q)

  3. (a - s), (b - q), (c - p,r), (d - q)

  4. (a - q), (b - s), (c - r), (d - p,q)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The addition polymers are formed by the repeated addition of monomer molecules possessing double or triple bonds, e.g., the formation of polythene from ethene and polypropene from propene. Addition polymers: Polyvinyl chloride, Polythene, Buna-S, Buna-N, etc.

Polystyrene  is a synthetic aromatic polymer made from the monomer styrene.
It is addition polymer as it is made of addition of monomers.

The condensation polymers are formed by repeated condensation reaction between two different bi-functional or tri-functional monomeric units. 

In these polymerisation reactions, the elimination of small molecules such as water, alcohol, hydrogen chloride, etc. take place. The examples are terylene (dacron), nylon 6, 6, nylon 6, etc. For example, nylon 6, 6 is formed by the condensation of hexamethylene diamine with adipic acid.


Hence, option A is correct.

Multiple choice chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

List -I                                List -II
A) Polystyrene               p) $C _{6}H _{5}-CH=CH _{2}$
B) Buna-S                      q) $CH _{2}=CH-CH=CH _{2}$
C) Buna - N                    r) $CH _{2}OH-CH _{2}OH$
D) Terylene                    s) Condensation polymer

  1. a- p

  2. b- p,q

  3. c-r

  4. d-r,s
Reveal answer Fill a bubble to check yourself
A,B,D Correct answer
Explanation

The condensation polymers are formed by repeated condensation reaction between two different bi-functional or tri-functional monomeric units. 

Terylene is a condensation polymer. Monomers of Terylene is ethylene glycol and teri-phthalic acid.
Buna-S is formed by the monomeric addition of compound styrene (p) and butadiene (q). 
Hence, options A, B and D are correct options.

Multiple choice chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

Non-stick frying pans are coated black with Teflon, a material that is resistant to heat. Teflon is a polymer of:

  1. fluoromethane

  2. styrene

  3. ethylene

  4. tetrafluoroethylene
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Teflon is a polymer of tetrafluoroethylene $\left({C} _{2}{F} _{4} \right)$, also known as polytetrafluoroethylene. It is a manmade polymer that has particular applications in manufactured products because of the chemical properties of Polytetrafluoroethylene.
Multiple choice chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

Teflon, a polymer of tetrafluoroethylene, is an excellent plastic material for films and coatings. Which of the following is not the property of Teflon?

  1. It is unaltered by radiation

  2. It can withstand high temperatures

  3. It is one of the most chemically-resistant plastic in the world

  4. It is an ideal insulator for high-frequency fittings
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

$PTFE$ (Poly tetra fluoro ethylene) is very sensitive and is therefore not suitable for applications involving exposure of any radiation as it will degrade.