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 biology human influences on the environment human intervention in ecosystems humans in the environment involvement of humans in the conservation of environment

Vulcanisation of Rubber is carried out to make it

  1. Soft

  2. Elastic

  3. Resistant to temperature changes

  4. Hard and inelastic
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Vulcanization is a chemical process that adds sulfur to rubber, creating cross-links between polymer chains. This makes the rubber more durable and resistant to temperature fluctuations.

Multiple choice copolymerisation types of polymerisation reactions polymer polymers chemistry

Teflon and Neoprene are the example of:

  1. copolymer

  2. monopolymer

  3. homopolymer

  4. condensation polymer.
Reveal answer Fill a bubble to check yourself
B,C Correct answer
Explanation

Teflon is homopolymer of monomeric units of tetra-fluoro-ethene

$CF _2=CF _2$
Neoprene is homopolymer of monomeric units of chloroprene [ $2-chloro-1,3-butadiene$].
so these are homopolymer and monomers, correct option is [B,C].

Multiple choice copolymerisation types of polymerisation reactions polymer polymers chemistry

Which of the following sets contain only addition homopolymers?

  1. Polythene, Natural rubber, Cellulose

  2. Nylon, Polyester, Melamine resin

  3. Teflon, Bakelite, Orlon

  4. Neoprene, PVC, Polythene
Reveal answer Fill a bubble to check yourself
A,D Correct answer
Explanation

On the basis of mode of polymerization, polymers can be classified into two types:-

[1] Addition polymer
[2] Condensation polymer
Addition polymers are formed by the repeated addition of monomer molecules possessing double or triple bonds. However, the addition polymers formed by the polymerization of a single monomeric species are known as homopolymers.
Example= Polythene: Made from the polymerization of ethene
Natural rubber: Made from the polymerization of cis-1,4-polyisoprene
Cellulose: Made from the polymerization of $\beta$ D- glucose
Neoprene: Made from the polymerization of chloroprene
PVC: Made from the polymerization of vinyl chloride

Multiple choice copolymerisation types of polymerisation reactions polymer polymers chemistry

On complete hydrogenation, natural rubber produces:

  1. ethylene-propylene copolymer

  2. vulcanized rubber

  3. polypropylene

  4. polybutylene
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Natural rubber forms due to polymerisation of isoprene and on hydrogenation provide a polymer of the ethylene-propylene copolymer.


Hence, option A is correct.

Multiple choice copolymerisation types of polymerisation reactions polymer polymers chemistry

Polymerisation in which two or more chemically different monomers take part is called 

  1. addition polymerisation

  2. copolymerisation

  3. chain polymerisation

  4. homopolymerisation
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Addition polymerisation - In this type of polymerisation, the molecules of the same monomer or different monomers add together on a large scale to form a polymer.
Copolymerisation - Copolymerisation is a polymerisation reaction in which a mixture of more than one monomeric species is allowed to polymerise to form a copolymer.
Chain polymerisation - Chain polymerisation or chain growth polymerisation is a polymerisation technique, where unsaturated monomer molecules add on to the active site on a growing polymerisation one at a time.
Homopolymerisation - Homopolymerisation is the polymerisation of a single type of monomer to form a homopolymer.

Multiple choice copolymerisation types of polymerisation reactions polymer polymers chemistry

Buna-S is a copolymer of:

  1. styrene and $1,\:3$ - butadiene

  2. styrene and ethylene
  3. $1,\:3$ - butadiene and ethylene
  4. $1,\: 3$ - butadiene and acrylonitrile
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Buna-S is formed from styrene and $1,:3$ - butadiene.
The reaction is shown below:
$nCH _2=CH-CH=CH _2 + nC _6H _5CH=CH _2 \rightarrow -(CH _2-CH=CH-CH _2-CH _2-CH(C _6H _5)) _n-$

Multiple choice copolymerisation types of polymerisation reactions polymer polymers chemistry

Which one of the following is an example of co-polymer ?

  1. Buna - S

  2. Teflon

  3. PVC

  4. Polypropylrnr
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Copolymer is a polymer made of two or more than two different monomers.

Buna-S is made of $1,3-$butadiene and styrene monomer.
But others are made of single polymer only.
Teflon $\longrightarrow$ Tetrafluorocarbon.
PVC $\longrightarrow$ Vinyl Chloride.
Polypropylene $\longrightarrow$ Propylene.

Multiple choice copolymerisation types of polymerisation reactions polymer polymers chemistry

Which of the following is not addition copolymer?

  1. Saran

  2. Vinyon

  3. SBR

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

PVC (Polyvinyl chloride) is formed by the addition polymerization of a single monomer, vinyl chloride, making it a homopolymer rather than a copolymer. Saran, Vinyon, and SBR are copolymers formed from two or more different monomers.

Multiple choice copolymerisation types of polymerisation reactions polymer polymers chemistry

Which one is not a synthetic rubber?

  1. Buna -S

  2. Homopolymers of 1, 3-butadiene derivative

  3. PVC

  4. Copolymer of 1, 3-butadiene
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

PVC is a thermoplastic polymer made from vinyl chloride monomer and is a plastic, not a synthetic rubber. Buna-S and copolymers/homopolymers of butadiene derivatives are classified as synthetic rubbers (elastomers).

Multiple choice copolymerisation types of polymerisation reactions polymer polymers chemistry

Caprolactam is the monomeric unit of :

  1. Nylon 6, 6

  2. Nylon 2-Nylon 6

  3. Nylon 6

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Nylon 6 is made from one kind of monomer called caprolactam. 

Nylon 6,6 is made from two monomers, adipoyl chloride and hexamethylene diamine.

Nylon 2–Nylon 6 is a copolymer of glycine and amino caproic acid. 
Multiple choice copolymerisation types of polymerisation reactions polymer polymers chemistry

Which of the following represents the example of a homopolymer ?

  1. PMMA

  2. Bakelite
  3. Nylon - $6,\:6$

  4. Neoprene
Reveal answer Fill a bubble to check yourself
A,D Correct answer
Explanation

When a polymer is made by linking only one type of small molecule or monomer together, it is called a homopolymer, e.g. PMMA and Neoprene.


When two different types of monomers are joined in the same polymer chain, the polymer is called a co-polymer, e.g., Nylon - $6,:6$ and Bakelite.

Multiple choice copolymerisation types of polymerisation reactions polymer polymers chemistry

Which of the following is a co-polymer ?

  1. Polytetrafluoroethylene

  2. Polyvinyl chloride

  3. Polyethylene
  4. Nylon - $6, \:6$

  5. Natural rubber
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A polymer derived from more than one species of monomer is a co-polymer e.g. Nylon - $6,:6$. 


All others are formed by following single monomers: 
Polytetrafluoroethylene - tetrafluoroethylene, 
Polyvinyl chloride - vinyl chloride, 
Polyethylene - ethylene and
 Natural rubber or polyisoprene - isoprene ($2$-methyl-$1,:3$-butadiene).

Multiple choice copolymerisation types of polymerisation reactions polymer polymers chemistry

Which of the following is an alternative copolymer?

  1. Styrene

  2. Neoprene
  3. Nylon - $2$ - nylon - $6$
  4. Nylon - $6$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Alternative polymers are those polymers which are formed by only two monomeric units which are alternatively arranged in polymeric chain Nylon - $2$ - nylon - $6$.
The formation is shown in the reaction below:
$HOOC-(CH _2) _4-COOH + H _2N-(CH _2) _2-NH _2 \rightarrow -[NH(CH _2) _2NHCO(CH _2) _4CO] _n- + nH _2O$

Multiple choice copolymerisation types of polymerisation reactions polymer polymers chemistry

Orion and Acrilan are fibres of well-known textile materials of the same name. They are copolymers of:

  1. styrene and butadiene

  2. alcohol and ester

  3. acrylonitrile and 2-vinylpyridine

  4. methane and acetone
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Orlon is also known as polyacrylonitrile hence is the copolymer of acrylonitrile.

Acrilan is also a copolymer of acrylonitrile.