Tag: introduction to polymers and its classification

Questions Related to introduction to polymers and its classification

Which polymers occur naturally?

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

  1. Starch and nylon

  2. Cellulose and nylon

  3. Starch and cellulose

  4. Protiens and PVC

Show answer
Correct Option: C
Explanation:

 Starch and cellulose are natural polymers. Nylon, rubber etc. are synthetic polymers.

so correct answer is C.

Which of the following is thermally stable?

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

  1. Silicone polymers

  2. Rayon

  3. Bakelite

  4. Perlon - L

Show answer
Correct Option: A
Explanation:

Silicones are polymers that include silicon together with carbon, hydrogen and oxygen.They have an alternating $  -Si-O-Si-  $ type structure. Silicones are water repellent, very resistant to chemical attack and are thermally stable since they do not decompose at high temperature.

Which of the following is an organic polymer?

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

  1. Glass

  2. Rayon

  3. Silicone rubbers

  4. All

Show answer
Correct Option: B
Explanation:

Rayon is a manufactured regenerated cellulose fibre. Therefore, it is an organic polymer but glass and silicon rubber are examples of non-organic polymer made up of silicone - silicone bond structure.

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-

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

  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

Show answer
Correct Option: C
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.

Which of the following are highly crossed linked polymers?

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

  1. Alkyd resin

  2. Melamine

  3. Bakelite

  4. Urea - formaldehyde

Show answer
Correct Option: A,B,C,D

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


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

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

  1. As elastomer, surface coatings.

  2. Life saving substance as blood plasma.

  3. For preparing cooking ware.

  4. Tyre cards production.

Show answer
Correct Option: B,C,D
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.

'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?

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

  1. For water-proofing

  2. Lining material for tanks

  3. In wire and cable insulation

  4. For sun-shading

Show answer
Correct Option: D
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.

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


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

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

  1. I > II > III

  2. I > III > II

  3. II > I > III

  4. III > II > I

Show answer
Correct Option: B
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 $(I)>(III)>(II)$

Which monomer would polymerise in isotactic, syndiotactic and atactic forms ?

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

  1. $CH _2 = CCl _2$

  2. $CH _3-CH=CH _2$

  3. $Ph-CH=CH _2$

  4. All of the above

Show answer
Correct Option: B,C

Which pair of polymers have similar properties?

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

  1. Nylon, $PVC$

  2. $PAN, PTFE$

  3. $PCTFE, PTFE$

  4. Bakelite, alkyle resin

Show answer
Correct Option: C
Explanation:

$PCTFE, PTFE$ both have same carbon backbone

  1. $-[ClFC - CF _{2}] _{n}$ $ = PCTFE$ (polymonochloro tetrafluoro ethylene)
  2. $ [F _{2}C - CF _{2}] _{n} = PTFE$ (polytetrafluoro ethylene).