Assignments Class 12 Chemistry Polymers

Please refer to Assignments Class 12 Chemistry Polymers Chapter 15 with solved questions and answers. We have provided Class 12 Chemistry Assignments for all chapters on our website. These problems and solutions for Chapter 15 Polymers Class 12 Chemistry have been prepared as per the latest syllabus and books issued for the current academic year. Learn these solved important questions to get more marks in your class tests and examinations.

Polymers Assignments Class 12 Chemistry

Question. Melamine plastic crockery is a codensation polymer of
(a) HCHO and melamine
(b) HCHO and ethylene
(c) melamine and ethylene
(d) None of these

Question. Which of the following natural products is not a polymer?
(a) DNA
(b) Cellulose
(c) ATP
(d) Urease

Question. Which of the following polymer is used for making phonograph records ?
(a) Bakelite
(b) Dacron
(c) Teflon
(d) PVC

Question. Dacron is a –
(a) crease resistant
(b) polyamide
(c) addition polymer
(d) polymer of ethylene glycol and phthalic acid 

Question. Protein is a polymer of:
(a) glucose
(b) terephthalic acid
(c) amino acids
(d) None of these

Question. Nylon 66 is a polyamide obtained by the reaction of
(a) COOH(CH₂)₄ COOH + NH₂C₆H₄NH₂
(b) COOH(CH₂)₄ COOH + NH₂ (CH₂)6 NH₂
(c) COOH (CH₂)₆ COOH + NH₂ (CH₂)₄ NH₂
(d) COOHC₆H₄ COOH–(p) + NH₂ (CH2)₆ NH₂

Question. Natural silk is a
(a) polyester
(b) polyamide
(c) polyacid
(d) polysaccharide

Question. Which of the following is/are a semisynthetic polymers?
(a) Cellulose acetate
(b) Polyvinyl chloride
(c) Cellulose nitrate
(d) Both (a) and (c)

Question. Which is/are true for elastomers?
(a) These are synthetic polymers possessing elasticity
(b) These possess very weak intramolecular forces or attractions between polymer chains
(c) Vulcanised rubber is an example of elastomer
(d) All of the above

Question. A polymer is formed when simple chemical units
(a) combine to form long chains
(b) combine to form helical chains
(c) break up
(d) become round

Question. Which is not true about polymers?
(a) Polymers do not carry any charge
(b) Polymers have high viscosity
(c) Polymers scatter light
(d) Polymers have low molecular weight

Question. Polymer formation from monomers starts by
(a) condensation reaction between monomers
(b) coordinate reaction between monomers
(c) conversion of monomer to monomer ions by protons
(d) hydrolysis of monomers.

Question. A homopolymer is obtained by polymerisation of:
(a) one type of monomer units
(b) two types of monomer units
(c) either of the above
(d) None of the above

Question. On the basis of mode of formation, polymers can be classified?
(a) as addition polymers only
(b) as condensation polymers only
(c) as copolymers
(d) both as addition and condensation polymers 

Question. Orlon is a polymer of
(a) styrene
(b) tetrafluoroethylene
(c) vinyl chloride
(d) acrylonitrile

Question. In elastomer, intermolecular forces are
(a) strong
(b) weak
(c) nil
(d) None of these

Question. The monomer of teflon is
(a) CHF == CH₂
(b) CF₂ == CF₂
(c) CHC₁ == CHCl
(d) CHF == CHC₁

Question. A thermoplastic among the following is
(a) bakelite
(b) polystyrene
(c) terylene
(d) urea-formaldehyde resin

Question. Which is an example of thermosetting polymer?
(a) Polythene
(b) PVC
(c) Neoprene
(d) Bakelite 

Question. Bakelite is obtained from phenol by reacting with
(a) (CH₂OH)₂
(b) CH₃CHO
(c) CH₃ COCH₃
(d) HCHO

Question. Among the following polymers the strongest molecular forces are present in
(a) elastomers
(b) fibres
(c) thermoplastics
(d) thermosetting polymers

Question. Generally, molecular mass of a polymer is over
(a) 100
(b) 500
(c) 1,000
(d) 10,000

Question. Melamine plastic crockery is a copolymer of:
(a) HCHO and melamine
(b) HCHO and ethylene
(c) melamine and ethylene
(d) None of these

Question. Caprolactam polymerises to give
(a) terylene
(b) teflon
(c) glyptal
(d) nylon-6

Question. For natural polymers PDI is generally
(a) 0
(b) 1
(c) 100
(d) 1000

Question. Isoprene is a valuable substance for making
(a) propene
(b) liquid fuel
(c) synthetic rubber
(d) petrol 

Question. Which of the following is currently used as a tyre cord ?
(a) Terylene
(b) Polyethylene
(c) Polypropylene
(d) Nylon – 6

Question. Which of the following are example of synthetic rubber?
(i) Polychloroprene (ii) polyacrylonitrile
(iii) Buna-N (iv) cis-polyisoprene
(a) (i) and (iii)
(b) (i) and (ii)
(c) (iii) and (iv)
(d) (ii) and (iii)

Question. Which of the following structures represents neoprene polymer?

Question. Which of the following is not a copolymer?
(a) Buna–S
(b) Baketite
(c) Neoprene
(d) Dacron

Question. Which of the following polymer is used for manufacturing of buckets, dustbins, pipes etc ?
(a) Low density polythene
(b) High density polythene
(c) Teflon
(d) Polyacrylonitrile

Question.Which of the following catalyst is used in preparation of high density polythene ?
(a) Peroxide catalyst
(b) Ziegler – Natta catalyst
(c) Wilkinson’s catalyst
(d) Pd – catalyst

Question. In the manufacture of tyre rubber, the percentage of sulphur used as a crosslinking agent is
(a) 2%
(b) 5%
(c) 10%
(d) 0.5%

Question. The process involving heating of rubber with sulphur is called
(a) Galvanisation
(b) Vulcanization
(c) Bessemerisaion
(d) Sulphonation

Question. Which of the following polymer is formed on reaction of 1,3–butadiene and acrylonitrile?
(a) Buna–S
(b) Buna – N
(c) Neoprene
(d) Dacron

Question. Which is not an example of copolymer ?
(a) SAN
(b) ABS
(c) Saran
(d) PVC

Question. Which of the following monomers form biodegradable polymers?
(a) 3-hydroxybutanoic acid + 3-hydroxypentanoic acid
(b) Glycine + amino caproic acid
(c) Ethylene glycol + phthalic acid
(d) both (a) and (b)

Question.Which of the following is thermoplastic ?
(a) Bakelite
(b) Polyethylene
(c) Terylene
(d) All of these

Question.Thermosets are:
(a) cross-linked polymers
(b) don’t melt or soften on heating
(c) cross-linking is usually developed at the time of moulding where they harden reversibly
(d) all of the above

 STATEMENT TYPE QUESTIONS

Question. Read the following statements.
(i) Rubber latex is a colloidal dispersion of rubber in water.
(ii) Natural rubber is a cis –1, 4–polyisoprene having elastic properties due to coiled structure and weak van der Waal’s forces.
(iii) Vulcanisation of natural rubber with sulphur and an appropriate additive is carried out above 415K.
(iv) In the manufacture of tyre rubber, 5% of sulphur is used as a cross-linking agent.
(v) Synthetic rubbers are homopolymers.
Which of the following is the correct code for the statements above?
(a) FFTFT
(b) TTFTF
(c) TTFFF
(d) FFTTF

Question. Consider the following statements.
(i) Polystyrene is a homopolymer whereas Buna–N is a copolymer.
(ii) Condensation polymers can be obtained by condensation between two similar bi–functional monomeric units.
(iii) Elastomers are the polymers in which the polymeric chains are held together by the weakest intermolecular forces.
(iv) Buna–S and Buna–N consist of close packing of chains which impart them crystalline nature.
Which of the following is the correct code for the statements above?
(a) TTFF
(b) TFTF
(c) FTFT
(d) TFFT

Question. Which of the following statements are correct?
(i) Buna–N being resistant to the action of petrol, lubricating oil and organic solvents is used in making oil seals.
(ii) Biodegradable polymers are manufactured because of low chemical resistance, strength and durability of conventional polymers.
(iii) PHBV is a copolymer used in the manufacture of orthopaedic devices.
(iv) Nylon 2–nylon 6 is a biodegradable polymer.
(a) (i), (ii) and (iii)
(b) (ii), (iii) and (iv)
(c) (i), (iii) and (iv)
(d) (i) and (iv)

Question. Which of the following statements are correct?
(i) A polyamide nylon 6,6 prepared by the condensation polymerisation of hexamethylene diamine with adipic acid is used in the manufacture of tyre cords.
(ii) Terylene is crease resistant and is blended with cotton and wool fibres for various applications.
(iii) Condensation reaction of phenol and formaldehyde to form novolac can be catalysed either by acid or base.
(iv) Melamine formaldehyde polymer is mainly used in the manufacture of electrical switches
(a) (i), (ii) and (iii)
(b) (ii), (iii) and (iv)
(c) (iii) and (iv)
(d) (ii) and (iii)

Question. Which of the following statement(s) is/are correct?
(i) Macromolecules have high molecular mass of order 10³ – 10⁷u.
(ii) Monomeric units are joined together by ionic or covalent bond.
(a) Only (i)
(b) Only (ii)
(c) Both (i) and (ii)
(d) Neither (i) nor (ii)

Question. Two condensation polymers are made
(1) ethylene diamine + ethane–1, 2– dicarboxylic acid
(2) trimethylenediamine + ethane–1, 2– dicarboxylic acid if both polymers of same molecular weight are obtained then which of the following statements is/are correct ?
(i) Polymer (1) is found to melt at lower temperature.
(ii) Polymer (2) is found to melt at lower temperature.
(iii) H-bonding is major factor.
(a) (i), (ii) and (iii)
(b) Only (ii)
(c) (i) and (iii)
(d) (ii) and (iii)

ASSERTION-REASON TYPE QUESTIONS

Directions : Each of these questions contain two statements,Assertion and Reason. Each of these questions also has four alternative choices, only one of which is the correct answer. You
have to select one of the codes (a), (b), (c) and (d) given below.
(a) Assertion is correct, reason is correct; reason is a correct explanation for assertion.
(b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(c) Assertion is correct, reason is incorrect
(d) Assertion is incorrect, reason is correct.

Question. Assertion : In vulcanisation of rubber, sulphur cross links are introduced.
Reason : Vulcanisation is a free radical initiated chain reaction.

Question. Assertion : Most of the Synthetic polymers are not biodegradable.
Reason : Polymerisation process induces toxic character in organic molecules.

Question. Assertion : Bakelite is a thermosetting polymer.   
Reason : Bakelite can be melted again and again without any change.

Question. Assertion : Olefinic monomers undergo addition polymerisation. 
Reason : Polymerisation of vinylchloride is initiated by peroxides/ persulphates.

Question. Assertion : Teflon has high thermal stability and chemical inertness.
Reason : Teflon is a thermoplastic.

Question. Assertion : The time of vulcanisation and temperature is increased by adding accelerators.
Reason : By vulcanising, a material of high tensile strength can be obtained.