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 types of polymerisation reactions condensation polymerisation polymer polymers chemistry

Polymer formation form monomers starts by:

  1. condensation reaction between monomers

  2. conversion of monomer to monomer ions by protons

  3. coordination reaction between monomers

  4. hydrolysis of monomers
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Polymerization occurs by a condensation reaction, which is a chemical reaction in which two molecules or moieties (functional groups) combine to form a larger molecule, together with the loss of a small molecule such as water, HCl etc.

Option A is correct.

Multiple choice types of polymerisation reactions condensation polymerisation polymer polymers chemistry

Hair sprays generally contain resins in a volatile solvent. Upon drying, they leave a thin film that holds the hair in place. Which of the following is a resin used in hair spray?

  1. Polyester

  2. Polyvinyl alcohol

  3. Polyvinyl pyrrolidone (PVP)

  4. Polythene
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
$PVP$ (Polyvinyl pyrrolidone) is a versatile ingredient which is used in cosmetics and beauty industry as a bindes, film former, emulsion stabilizer, suspending agent and hair fixative used in products like mascara, eyeliner, hair conditioners, hair sprays and shampoos.
Multiple choice types of polymerisation reactions condensation polymerisation polymer polymers chemistry

Which of the following polymers can be made by condensation polymerisation reaction?

  1. Dacron
  2. Nylon - $6,\: 6$

  3. Bakelite

  4. Polyethylene
Reveal answer Fill a bubble to check yourself
A,B,C Correct answer
Explanation

Condensation polymers are formed by repeated condensation reactions 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. takes place. 

Dacron, Nylon-6.6 and Bakelite are produced by condensation polymerisation.

On the other hand, Polyethylene is formed by breakage of the double bond and there is no elimination of molecules.


Multiple choice types of polymerisation reactions condensation polymerisation polymer polymers chemistry

Which of the following is/are not a condensation copolymer?

  1. Nylon-$6$
  2. Nylon-$6,6$

  3. Dacron

  4. PVC
Reveal answer Fill a bubble to check yourself
A,D Correct answer
Explanation
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, etc. For example, nylon 6, 6 is formed by the condensation of hexamethylenediamine with adipic acid.

When two different types of monomers are joined in the same polymer chain, the polymer is called a copolymer. 
Nylon 6 is a condensation polymer but it's not a co-polymer.
PVC is an addition polymer.

Hence, options A and D are correct.
Multiple choice types of polymerisation reactions condensation polymerisation polymer polymers chemistry

Nylon-$6$ is prepared by linear condensation homopolymerization reaction of: 

  1. caprolactum

  2. hexamethylene diamine and adipic acid
  3. $6$-aminohexanoic acid

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

Solution:- (A) Caprolactam

Nylon-$6$ is prepared by linear condensation homopolymerization reaction of caprolactam.
$n \left( \text{Caprolactum} \right) \xrightarrow[{N} _{2}]{533 \; K} \text{Nylon}-6$

Multiple choice biology waste generation and management disposal of waste safe disposal of waste solid waste and its management

Select the incorrect statement regarding polyblend.

  1. Recycled and modified form of plastic

  2. Used to lay road when mixed with bitumen

  3. Enhances the water absorbing capacity of bitumen

  4. Both A and B
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Polyblend is a fine powder of recycled modified plastic. The binding property of plastic makes the road last longer besides giving strength to withstand more loads when mixed with bitumen. Polyblend lowers moisture absorption capacity due to the coating of plastics at the surface.

So, the incorrect statement regarding polyblend is 'Enhances the water absorbing capacity of bitumen'.

Multiple choice biology biotechnology and genetic engineering making use of enzymes genetic technology genetic engineering

Nitrocellulose and nylon are used in which of the following technique of immobilisation?

  1. Entrapment

  2. Encapsulation

  3. Adsorption

  4. Cross-linking
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Encapsulation involves enclosing enzymes within a semi-permeable membrane, such as nitrocellulose or nylon, to immobilize them while allowing substrate and product diffusion.

Multiple choice chemistry chemical reactions of organic compounds commercially important alcohols - methanol methanol some commercially important alcohols uses of alcohols

From methyl alcohol we get:

  1. bakelite, a hard plastic

  2. the rubber neoprene

  3. the plastic perspex

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

Solution:- (A) bakelite, a hard plastic.

Explanation:-
Methyl alcohol on reaction with formaldehyde at room temperature and pressure gives bakelite.

Multiple choice chemistry substances in daily use polyester and acrylic rayon and nylon synthetic fibres

Polyester consists of :

  1. repeating unit of ether

  2. monomer of ester

  3. repeating units of ester

  4. monomer of ether
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Polyester is a category of polymers that contain ester in their main chain.


 Polyesters are used to make bottles, films, holograms, filters, dielectric film for capacitors, film insulation for wire and insulating tapes.

Hence the correct option is C.