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 synthetic polyamides polymerisation chemistry

Which of the following polymers are used as fibre?

  1. Nylon

  2. Polytetrafluoroethane

  3. Terylene

  4. Buna-S
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Nylon is used as fiber because, it is very important substitute of silk, it's other properties is elasticity, strength and resistance for mildew.

So the correct option is [A].

Multiple choice synthetic polyamides polymerisation chemistry

Polymer which has amide linkage is:

  1. nylon-$6,6$

  2. terylene

  3. teflon

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

Polyamides have the amide linkage.

Example- Nylon 6-6, Nylon 6
Nylon 6, 6 is used in making sheets, bristles for brushes and in the textile industry.

The correct option is [A].

Multiple choice synthetic polyamides polymerisation chemistry

Which of the following polymers does not have vinylic monomer units?

  1. Acrilan

  2. Nylon

  3. Polystyrene

  4. Neoprene
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
 Acrilan  $(-CH _2=CHCN-) _n$
 Polystyrene  $(-C _6H _5-CH _2=CH _2-) _n$
 Neoprene  $(-CH _2=CHCl-) _n$
 Nylon  $(Hexa methylene \,di amine + adipic\,acid) _n$

Only nylon does not have vinylic monomer units.

So the correct option is [B].

Multiple choice synthetic polyamides polymerisation chemistry

The polymer formed by the condensation of hexamethylenediamine and adipic acid is

  1. Teflon

  2. Bakelite

  3. Dacron

  4. Nylon-66
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The polymer formed by the condensation of hexamethylenediamine $\displaystyle (H _2N-(CH _2) _6-NH _2)$ and adipic acid $\displaystyle (HOOC-(CH _2) _4-COOH)$ is Nylon-66.
$\displaystyle H _2N-(CH _2) _6-NH _2+HOOC-(CH _2) _4-COOH  \xrightarrow {\Delta} H _3N^+-(CH _2) _6-NH _3^+O^-OC-(CH _2) _4-COO^-$


$\displaystyle nH _3N^+-(CH _2) _6-NH _3^+O^-OC-(CH _2) _4-COO^-\xrightarrow [-H _2O]{\Delta} \underset{\text{Nylon} 6,6}{[HN-(CH _2) _6-NH \underset {\displaystyle  \underset {\displaystyle \text {O }}{||} }{C}-(CH _2) _4- \underset {\displaystyle  \underset {\displaystyle \text {O }}{||} }{C}] _n}$

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

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.