NCERT MOST IMPORTANT QUESTIONS CLASS – 12 | CHEMISTRY IMPORTANT QUESTIONS | CHAPTER – 15 | POLYMERS | EDUGROWN |

In This Post we are  providing Chapter-15 POLYMERS NCERT MOST IMPORTANT QUESTIONS for Class 12 CHEMISTRY which will be beneficial for students. These solutions are updated according to 2021-22 syllabus. These MCQS  can be really helpful in the preparation of Board exams and will provide you with a brief knowledge of the chapter

NCERT MOST IMPORTANT QUESTIONS ON POLYMERS

Question 1.
Mention two important uses of each of the following :
(i) Bakelite
(ii) Nylon 6
Answer:
(i) Bakelite :
(i) It is used in making handles of utensils.
(ii) Also used in production of billiard balls, dominoes and pieces for games like chess.
(ii) Nylon 6 :
(i) Nylon is used in making stockings.
(ii) It is also used for making parachutes.

Question 2.
Name the sub-groups into which polymers are classified on the basis of magnitude of intermolecular forces.
Answer:

1. Elastomers
2. Fibres
3. Thermoplastic polymers
4. Thermosetting polymers.

Question 3.
Draw the structure of the monomer for each of the following polymers : (Delhi 2012)
(i) Nylon-6
(ii) Polypropene
Answer:
(i) Nylon-6 :

Question 4.
Define thermoplastic and thermosetting polymers. Give one example of each.
Answer:
Thermoplastic polymers : Linear polymers in which the intermolecular forces of attraction are in between those of elastomers and fibres and can be melted again and again on heating followed by moulding to give desired shape.
Example : Polyethene, Polyvinyl chloride (PVC) etc.

Thermosetting polymers : These are semifluid substances with low molecular masses which when heated in a mould, undergo change in chemical composition to give a hard, infusible and insoluble mass. These cannot be re-melted.
Example : Bakelite, Melamine etc.

Question 5.
Write the name and structure of the monomer of each of the following polymers :
(i) Neoprene
(ii) Buna-S
(iii) Teflon
Answer:

Question 6.
Differentiate between thermoplastic and thermosetting polymers. Give one example of each. (Delhi 2013)
Answer:
Thermoplastic polymers : Linear polymers in which the intermolecular forces of attraction are in between those of elastomers and fibres and can be melted again and again on heating followed by moulding to give desired shape.
Example : Polyethene, Polyvinyl chloride (PVC) etc.

Thermosetting polymers : These are semifluid substances with low molecular masses which when heated in a mould, undergo change in chemical composition to give a hard, infusible and insoluble mass. These cannot be re-melted.
Example : Bakelite, Melamine etc.

Question 7.
Draw the structures of the monomers of the following polymers :
(i) Polythene
(ii) PVC
(iii) Teflon
Answer:

(ii)

(iii)

Question 8.
Write the names and structures of the monomers of the following polymers :
(i) Buna-S
(ii) Dacron
(iii) Neoprene
Answer:

Question 9.
How are polymers classified on the basis of mode of polymerization? Explain with suitable examples. (Comptt. Delhi 2012)
Answer:
Polymers can be classified on the basis of mode of polymerisation into two groups :
(i) Addition polymers : The addition polymers are formed by the repeated addition of monomer molecules possessing double or triple bonds.

(ii) Condensation polymers : They are formed by repeated condensation reaction between two different bi-functional or tri-functional monomeric units.

Question 10.
Explain the term co-polymerization and give two examples of copolymers and the reactions for their preparations.
Answer:
Co-polymerization : Co-polymerization is a polymerization reaction in which a mixture of more than one monomeric species is allowed to polymerise and form a copolymer.
Example : Buna- S, Buna-N.
Equations :