Please refer to CBSE Class 12 Chemistry HOTs Polymers. Download HOTS questions and answers for Class 12 Chemistry. Read CBSE Class 12 Chemistry HOTs for Unit 15 Polymers below and download in pdf. High Order Thinking Skills questions come in exams for Chemistry in Class 12 and if prepared properly can help you to score more marks. You can refer to more chapter wise Class 12 Chemistry HOTS Questions with solutions and also get latest topic wise important study material as per NCERT book for Class 12 Chemistry and all other subjects for free on Studiestoday designed as per latest CBSE, NCERT and KVS syllabus and pattern for Class 12
Unit 15 Polymers Class 12 Chemistry HOTS
Class 12 Chemistry students should refer to the following high order thinking skills questions with answers for Unit 15 Polymers in Class 12. These HOTS questions with answers for Class 12 Chemistry will come in exams and help you to score good marks
HOTS Questions Unit 15 Polymers Class 12 Chemistry with Answers
Answer. The polymer formed by the polymerization of single/same monomeric species is known as homopolymerisation. E.g., Polythene/PVC/Polypropene.
Question. Give an example of elastomer.
Answer. Natural rubber or Buna-S or Buna-N or Neoprene.
Question. Why is bakelite a thermosetting polymer ?
Answer. Because bakelite have three dimensional network of covalent bonds with crosslinking between chains.
Question. Write the monomers of Buna-N.
Answer.
Question. Is [H2CCH(C6H5)]n a homopolymer or copolymer ? Why ?
Answer. Homopolymer, because it is formed by polymerization of one kind of monomer species.
Question. Write the structure and one use of urea formaldehyde resin.
Answer. [HNCONHCH2 ]n
It is used in unbreakable crockery.
(i) PVC (ii) Nylon-6
Answer.
Question. What is the repeating unit in the condensation polymer obtained by combining HOOCCH2CH2COOH (succinic acid) and H2NCH2CH2NH2 (ethylene diamine) ?
Answer.
Question. Draw the structure of monomers of the following polymers :
(i) Teflon (ii) Polythene
Answer. (i) F2C = CF2 Tetrafluoroethene
(ii) H2C = CH2 Ethene
Question. Name the two groups into which polymers are classified on the basis of magnitude of intermolecular forces.
Answer. (i) Elastomers
(ii) Fibres
(iii) Thermoplastic polymers
(iv) Thermosetting polymers
Question. Mention two important uses of each of the following :
(i) Bakelite (ii) Nylon-6
Answer. (i) Bakelite : For making combs, electrical switches, handles of utensils, computer disc etc.
(ii) Nylon-6 : For making tyre cords, fabrics, ropes etc.
Question. Distinguish between homopolymers and copolymers with an example of each.
Answer. Homopolymers : Polymers whose repeating structural units are derived from only one type of monomer units are called homopolymers. For example, Polythene.
Copolymers : Polymers whose repeating structural units are derived from two or more types of monomer units are called copolymers. For example, Nylon-6, 6.
Question. What is step growth polymerisation ? Explain with an example.
Answer. Step growth polymerisation involves condensation between monomers having multifunctional groups. It is also known as condensation polymerisation. E.g.,
Question. What is the difference between elastomers and fibres ? Give one example of each.
Answer. Elastomers : Polymers in which the intermolecular forces of attraction between the polymer chains are weakest are called elastomers. E.g., Natural rubber.
Fibres : Polymers in which intermolecular forces of attraction are the strongest are called fibres. E.g., Nylon-6, 6.
Question. Mention the important uses of each :
(i) Nylon-6, 6 (ii) PVC
Answer. (i) Uses of Nylon-6, 6 :
(a) It is used in making carpets, textile fibres etc.
(b) It is used for making elastic hosiery.
(a) It is used for making raincoats, hand bags etc.
(b) It is used in making water pipes.
Question. Write the names and structure of the monomers of the following polymers :
(i) Buna-S (ii) Neoprene (iii) Nylon-6
Answer.
Question. Write names and structure of monomers of following polymers :
(i) Bakelite (ii) Nylon-6 (iii) Polythene
Answer. (i) Phenol and formaldehyde
C6H5OH + HCHO
(ii) Caprolactum
H2C = CH2
Question. Write names and structure of monomers of following polymers :
(i) Polystyrene (ii) Dacron (iii) Teflon
(ii) Ethylene glycol + Terephthalic acid
F2C = CF2
Question. (i) What is the role of t-butyl peroxide in the polymerisation of ethane ?
(ii) Identify the monomers in the following polymer :
[ HN(CH2 ) NHCO(CH2 )4 CO ]
(iii) Arrange the following polymers in the increasing order of their intermolecular forces :
Polystyrene, Terylene, Buna-S
Answer. (i) Catalyst/initiator of free radical
(ii) Hexamethylenediamine and adipic acid
(iii) Buna-S < Polystyrene < Terylene
Question. Write the mechanism of free radical polymerisation of ethane.
Answer. (i) Chain initiation step
Question. Write chemical equation for the synthesis of :
(i) Nylon-6, 6 (ii) Neoprene (iii) Terylene
Answer. (i) Nylon-6, 6 :
Question. Write the monomers which are used for the synthesis of following polymers :
(i) Terylene (ii) Polythene (iii) Bakelite
Indicate the type of polymerisation for each which forms polymers.
Answer. Monomers Type of polymerisation
(i) Ethylene glycol + Terephthalic acid Condensation
(ii) Ethene Addition
(iii) Phenol + Formaldehyde Condensation
Question.
a homopolymer or a copolymer ?
Answer. Homopolymer.
Question. Which of the following is natural polymer ?
Buna-S, Proteins, PVC
Answer. Proteins.
Question. Based on molecular forces what type of polymer is neoprene ?
Answer. Elastomer.
Question. Which of the following is a fibre ?
Nylon, Neoprene, PVC
Answer. Nylon
SHORT ANSWER-I TYPE QUESTIONS
Question.Arrange the following polymers in the order of increasing intermolecular forces :
(i) Nylon-6, Buna-S, Polythene
(ii) Nylon-6, Neoprene, Polyvinyl chloride
Answer. (i) Buna-S < Polythene < Nylon-6
(ii) Neoprene < Polyvinyl chloride < Nylon-6
Question.Define thermoplastic and thermosetting polymers. Give one example of each.
Answer. Thermoplastics : Polymers in which the intermolecular forces of attraction are in between those of elastomers and fibres are called thermoplastics. E.g., Nylon-6, PVC, etc.
Thermosetting polymers : These are semi-fluid substances with low molecular
masses which when heated in a mould undergo a permanent change in chemical composition to give hard, infusible and insoluble mass. E.g., Bakelite.
Question.What is biodegradable polymer ? Give an example of a biodegradable polymer.
Answer. Biodegradable polymers are those which are decomposed by micro organisms.
E.g., PHBV (Poly-B-hydroxybutyrate – Co – B – hydroxyl valerate).
Question.How does vulcanization change the character of natural rubber ?
Answer. It introduce sulphur bridge or cross-link between polymer chain.
Question.Name a polymer each for the following applications :
(i) Insulation of electrical switches
(ii) Making laminated sheets
Answer. (i) Bakelite (ii) Urea formaldehyde resin
Question.How does the presence of double bonds in rubber influence their structure and reactivity ?
Answer. Natural rubber is a cis-polyisoprene. These cis- double bonds do not allow to polymer unit to come close for effective interaction. Hence rubber show elasticity.
SHORT ANSWER-II TYPE QUESTIONS
Question. How are polymers classified on the basis of mode of polymerisation ? Explain with examples.
Answer. Addition polymers : Are formed by repeated addition of a large number of same or different monomers possessing double or triple bonds. E.g., Polythene.
Question.A monomer of a polymer on ozonolysis gives two moles of CH2O and one mol of
Write the structure of monomer and polymer and each step of reaction.
Answer. Structure of monomer :
Question.Can a copolymer be formed in both addition and condensation polymerisation ? Explain with examples.
Answer. Yes. Buna-S, Buna-N : Addition polymer
Nylon-6, 6, terylene : Condensation
(i) Dacron (ii) Nylon-6 (iii) Buna-N
(iv) Glyptal (v) PHBV
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CBSE Class 12 Chemistry Unit 15 Polymers HOTS
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HOTS for Chemistry CBSE Class 12 Unit 15 Polymers
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Unit 15 Polymers HOTS Chemistry CBSE Class 12
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Unit 15 Polymers CBSE Class 12 HOTS Chemistry
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CBSE HOTS Chemistry Class 12 Unit 15 Polymers
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