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 classification of polymers introduction to polymers and its classification polymer polymers chemistry

Suppose A and B are two monomers.
Match the following types of Copolymers with their correct arrangements.


List - I                                                List - II
(i) Random Copolymer                       1) (A-A-A-A)-(B-B-B-B)-(A-A-A)

(ii) Block Copolymer                          2) -A-B-A-B-A.

(iii) Graft Copolymer                          3) -A-B-A-A-A-B-B-A-B-A-A-

                                                                                      B-B-B-B-
                                                                                      $|$
(iv) Alternating Copolymer                4)-A-A-A-A-A-A-A-A-A-
                                                                     $|$
                                                                    B-B-B-B-

  1. (i)-1, (ii)-2, (iii)-3, (iv)-4

  2. (i)-2, (ii)-4, (iii)-3, (iv)-1

  3. (i)-3, (ii)-1, (iii)-4, (iv)-2

  4. (i)-4, (ii)-3, (iii)-1, (iv)-2
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A) Random copolymer is that in which there is no specific arrangement of monomers, but it is formed by two or more than two monomers.
B) Block copolymer is (A-A-A-A)-(B-B-B-B)-(A-A-A-A)-, as the polymer is divided in subunits (blocks) of a single type of monomer.
C) Graft means branched copolymer.
D) Alternating copolymer is formed by only two monomeric units arranged alternatively.

Multiple choice classification of polymers introduction to polymers and its classification polymer polymers chemistry

$Si(Cl) _2(CH _3) _2 \xrightarrow {Hydrolysis} A \xrightarrow {Polymerisation} B (Polymer)$ 


What is/are the use(s) of $B$?

  1. As elastomer, surface coatings.

  2. Life saving substance as blood plasma.

  3. For preparing cooking ware.

  4. Tyre cards production.
Reveal answer Fill a bubble to check yourself
B,C,D Correct answer
Explanation

${ (C{ H } _{ 3 } }) _{ 2 }Si{ Cl } _{ 2 }+{ H } _{ 2 }O\longrightarrow { (C{ H } _{ 3 } }) _{ 2 }SiO+2HCl$


$n[{ (C{ H } _{ 3 } }) _{ 2 }SiO]\xrightarrow { polymerisation } { [{ (C{ H } _{ 3 } }) _{ 2 }SiO] } _{ n }$

The polymer ${ [{ (C{ H } _{ 3 } }) _{ 2 }SiO] } _{ n }$ is used as life saving substance as blood plasma, for preparing cooking ware and tyre production.

Multiple choice classification of polymers introduction to polymers and its classification polymer polymers chemistry

'Koroseal' is a long, chain polymer. When mixed with plasticizers, it forms an excellent plastic. Which one of the following is not the use of it?

  1. For water-proofing

  2. Lining material for tanks

  3. In wire and cable insulation

  4. For sun-shading
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Koreseal is a long chain polymer of vinyl chloride $(CH _2CHCl)$.

Vinyl polymers are heat, electricity and corrosion resistant and are unaffected by exposure to light or by long storage.
When it is mixed with plasticizers, it is used as wall covering paints for water proofing property; lining material for tanks; also used in wire and cable insulation.

Multiple choice classification of polymers introduction to polymers and its classification polymer polymers chemistry

Arrange the following types of polymer in order of decreasing force of attraction.


   Fibres        Elastomer                Thermoplastic
      (I)                 (II)                               (III)

  1. I > II > III

  2. I > III > II

  3. II > I > III

  4. III > II > I
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Fiber have strong intermolecular forces of attraction take H-bonding.


Elastomers have weak fores of attraction which thermoplastic have weakest 
forces like london or dispersion forces / vanderwaal forces.

So order is $(I)>(III)>(II)$

Multiple choice botany fibre to fabric: plant fibre classification of fibres fibres history of fabric

Which of the following is monomer of natural rubber?

  1. Isoprene

  2. Chloroprene

  3. Caprolactum

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

Natural rubber is an addition polymer that is obtained as a milky white fluid known as the latex from a tropical rubber tree. Natural rubber is from the monomer isoprene (2-methyl-1,3-butadiene). Since isoprene has two double bonds, it still retains one of them after the polymerization reaction. Natural rubber has the cis configuration for the methyl groups. So, the correct option is A i.e. Isoprene.

Multiple choice chemistry polymer addition polymerisation types of polymerisation reactions petrochemicals and polymers

The monomer that undergo radical polymerisation most easily is ?

  1. $CH _2=CH _2$
  2. $C _6H _5CH=CH _2$
  3. $CH _2=C{(Me)} _2$
  4. $CH _3-CH=CH _2$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Ethylene (CH2=CH2) is the simplest monomer and undergoes radical polymerization most readily because it lacks steric hindrance and has no substituents that would stabilize or destabilize the radical intermediate significantly compared to substituted monomers.

Multiple choice chemistry polymer addition polymerisation types of polymerisation reactions petrochemicals and polymers

Which of the following polymers can be made by free radical addition polymerisation mechanism?

  1. PE

  2. HDPE

  3. LDPE

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

The polymers polyethene (PE), low density polyethene(LDPE), high density polyethene(HDPE) and teflon (polytetrafluoroethylene) can be made by free radical addition polymerisation (also known as chain growth polymerisation) mechanism.  To obtain free radicals, initiators such as benzoyl peroxide, tert-butyl peroxide or acetyl peroxide are used.