Please refer to Polymers Class 12 Chemistry Important Questions with solutions provided below. These questions and answers have been provided for Class 12 Chemistry based on the latest syllabus and examination guidelines issued by CBSE, NCERT, and KVS. Students should learn these problem solutions as it will help them to gain more marks in examinations. We have provided Important Questions for Class 12 Chemistry for all chapters in your book. These Board exam questions have been designed by expert teachers of Standard 12.
Class 12 Chemistry Important Questions Polymers
Very Short Answer Questions
Question. Arrange the following polymers in the increasing order of their intermolecular forces : Polystyrene, Terylene, Buna-S.
Answer. The intermolecular forces are least in case of elastomers like Buna-S while strongest in case of bres like terylene and in case of thermoplastics like polystrene the intermolecular forces are intermediate in between elastomers and bres. Thus, the increasing order of their intermolecular forces is Terylene > Polystyrene > Buna-S
Question. Define the term, ‘homopolymerisation’ giving an example.
Answer. A polymer made by polymerisation of a single monomer is known as homopolymer and the process is known as homopolymerisation For e.g., Polythene made by polymerisation of ethene molecules.
Question. Explain the following term giving a suitable example :
Answer. Elastomers are the polymers in which polymer chains are held by weakest intermolecular forces.
e.g. Buna-S, Buna-N.
Question. Define the term ‘polymerisation’.
Answer. The process of formation of macromolecules/ polymers from their respective monomeric units, is called polymerisation.
Question. What is the primary structural feature necessary for a molecule to make it useful in a condensation polymerisation reaction?
Answer. Monomers should possess more than one functional group.
Question. What is the difference between the two notations :
nylon – 6 and nylon – 6,6 ?
Answer. Nylon 6 is obtained from the monomer caprolactam which contains 6 carbon atoms. Nylon 6,6 is a condensation polymer of hexamethylene diamine and adipic acid. Both the monomers have 6 carbon atoms each.
Question. Write the names and structures of the monomer of the following polymer :
Answer. PHBV – Poly – β – hydroxybutyrate – co – β – hydroxyvalerate Structure :
Question. What are biodegradable polymers? Give one example.
Answer. Biodegradable Polymers : The natural polymer, which disintegrates by itself or by micro-ogranisms within certain period of time is called biodegradable polymer, e.g., PHBV (poly–β–hydroxybutyrate–co– β–hydroxyvalerate), Nylon 2–nylon 6.
Short Answer Questions
Question. Define thermoplastic and thermosetting polymers. Give one example of each.
Answer. Thermoplastics : Thermoplastics are linear or slightly branched polymers which can be repeatedly soened on heating and hardened on cooling and hence can be used again and again without any change in chemical composition and mechanical strength.
Example : Polythene and polystyrene.
Thermosetting Polymers: Thermosetting polymers on heating in a mould get hardened and set and cannot be soned again. This hardening on heating is due to cross-linking between different polymer chains to give a three-dimensional network solid.
Example : Bakelite.
Question. Write the names and structures of the monomers of the following polymers :
(i) Nylon 6, 6 (ii) Neoprene
Answer. (i) Nylon 6,6 :
HOOC — (CH2)4 — COOH and adipic acid
Question. Explain the term ‘copolymerisation’ and give two examples of copolymerization.
Answer. Copolymerization : When the polymers are synthesised by polymerization of two or more than two different monomers then this process is called as copolymerization. example,
(i) Styrene butadiene rubber (SBR) :
Question. Give names of the monomers of the following polymers :
(i) Neoprene (ii) Polystyrene
Question. Give one example each of
(i) addition polymers,
(ii) condensation polymers,
Answer. (i) Addition polymers : Polythene, rubber.
(ii) Condensation polymers : Terylene, Nylon 6,6.
(iii) Copolymers : SBR, Buna-N.
Question. Draw the structure of the monomer for each of the following polymers.
(i) Nylon-6 (ii) Polypropene
Question. What are biodegrable and non-biodegradable polymers? Give one example of each class.
Long Answer Questions
Question. Write the monomers of the following polymers and classify them as addition or condensation polymers :
Teon, Bakelite and Natural rubber
Answer. Teon : CF2 = CF2 : Addition Polymer
Question. Mention two important uses for each of the following polymers :
(i) Bakelite (ii) Nylon 6,6
Answer. (i) Bakelite – (1) In electrical switches
(2) In making handles of various utensils.
(ii) Nylon 6,6 – (1) In Fabrics
(2) In tyre cords
(iii) PVC – (1) In hand bags
(2) In water pipes
Question. Write a distinguishing feature between homopolymer and copolymer.
Answer. Homopolymer : A polymer made by polymerisation of a single monomer is known as homopolymer and the reaction is called homopolymerisation. e.g. Polythene made by ethene molecules.
Copolymer : A polymer made by polymerisation of two or more different monomers is called copolymer and the reaction is called copolymerisation. When styrene and butadiene are polymerised together, a polymer called styrene-butadiene rubber is formed