Chemistry

Polymers and Plastics

1,228 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

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.

Multiple choice

which of the following correctly describes biodegradable plastics

  1. some plastics deteriorate when exposed to sunlight

  2. plastic that contain sugar can be broken down by bacteria

  3. degradable plastics usually bread down smaller pieces

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Biodegradable plastics encompass multiple types: photodegradable (break down in sunlight), biodegradable (sugar-based plastics broken down by microbes), and degradable plastics that fragment into smaller pieces. 'All of the above' correctly captures the variety of technologies.

Multiple choice chemistry animal fibre synthetic fibres & their characteristics processing of fibres synthetic fibres and its types

Which of the following is not a natural polymer?

  1. Starch

  2. Nucleic acid

  3. Polystyrene

  4. Protein
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Polystyrene is made of styrene monomer which is a synthetic polymer. The monomer is a liquid petrochemical.

Polystyrene are used in making CD, jewel cases, expanded polystyrene (EPS) Foam products from Foam cups to Foam coolers, etc.