Bihar Board 12th Chemistry Objective Answers Chapter 15 Polymers

Bihar Board 12th Chemistry Objective Questions and Answers

Bihar Board 12th Chemistry Objective Answers Chapter 15 Polymers

Question 1.
Glycogen, a naturally occuring polymert stored in animals is a
(a) monosaccharide
(b) disaccharide
(c) trisaccharide
(d) polysaccharide
Answer:
(d) polysaccharide

Question 2.
Which of the following is a homopolymer ?
(a) Bakelite
(b) Nylon 6,6
(c) Neoprene
(d) Buna-S
Answer:
(c) Neoprene

Question 3.
Which of the following sets contain only addition homopolymers ?
(a) Polythene natual rubber, cellulose
(b) Nylon polyester, melamine resin
(c) Teflon, bakelite, orlon
(d) Neoprene, PVC, polythene
Answer:
(d) Neoprene, PVC, polythene

Question 4.
Teflon and neoprene are the examples of
(a) copolymers
(b) monomers
(c) homopolymers
(d) condensation polymers
Answer:
(c) homopolymers

Question 5.
The correct structure of monomers of buna-S is

Answer:
(c)

Question 6.
The S in buna-S refers to
(a) sulphur
(b) styrene
(c) sodium
(d) salicylate
Answer:
(b) styrene

Question 7.
Arrange the following polymes in an increasing order of intermolecular forces; fibre, plastic, elastomer.
(a) Elastomer < Fibre < Plastic
(b) Elastomer < Plastic < Fibre
(c) Plastic < Elastomer < Fibre
(d) Fibre < Elastomer < Plastic
Answer:
(b) Elastomer < Plastic < Fibre

Question 8.
Which of the following are thermoplastic polymers ?
(a) Polythene, urea-formaldehyde, polyvinyls
(b) Bakelite, polythene, polystyrene
(c) Polythene, polystyrene, polyvinyls
(d) Urea-f ormaldehydc, polystyrene, bakelite
Answer:
(c) Polythene, polystyrene, polyvinyls

Question 9.
Bakelite is an example of
(a) elastomer
(b) fibre
(c) thermoplastic
(d) thermosetting
Answer:
(d) thermosetting

Question 10.
Which of the following is not an example of addition polymer ?
(a) Polythene
(b) Polystyrene
(c) Neoprene
(d) Nylon 6,6
Answer:
(d) Nylon 6,6

Question 11.
Which of the following sets contains only addition polymers ?
(a) Polythelene, polypropylene, terylene
(b) Polyethylene, PVC, acrilan
(c) Buna-S, nylon, polybutadiene
(d) Bakelite, PVC, polyethylene.
Answer:
(b) Polyethylene, PVC, acrilan

Question 12.
Which of the following polymers does not have vinylic monomer units ?
(a) Acrilan
(b) Nylon
(c) Polystyrene
(d) Neoprene
Answer:
(b) Nylon

Question 13.
Which of the following is not true about high density polythene ?
(a) Tough
(b) Hard
(c) Inert
(d) Highly branched
Answer:
(d) Highly branched

Question 14.
Composition of Ziegler-Natta catalyst is
(a) (Et₃)₃Al-TiCl₂
(b) (Me)₃AI TiCl₂
(c) (Et)₃Al-TiCl₄
(d) (Et)₃Al-PtCl₄
Answer:
(c) (Et)₃Al-TiCl₄

Question 15.
Nylon 6,6 is obtained by condensation polymerisation of
(a) adipic acid and ethlene glycol
(b) adipic acid and hexamethylenediamine
(c) terephthalic acid and ethlene glycol
(d) adipic acid and phenol
Answer:
(b) adipic acid and hexamethylenediamine

Question 16.
Synthetic polymer prepared by using caprolactam is known as
(a) terylene
(b) teflon
(c) nylon 6
(d) neoprene
Answer:
(c) nylon 6

Question 17.
Which of the following is a condensation polymer ?
(a) Teflon
(b) PVC
(c) Polyester
(d) Neoprene
Answer:
(c) Polyester

Question 18.
Polymer which has amide linkage is
(a) nylon-6,6
(b) terylene
(c) teflon
(d) bakelite
Answer:
(a) nylon-6,6

Question 19.
Dacron is an example of
(a) polyamides
(b) polypropenes
(c) polyacrylonitrile
(d) polyesters
Answer:
(d) polyesters

Question 20.
Which of the following polymes does not involve cross­linkages ?
(a) Vulcanised rubber
(b) Bakelite
(c) Melamine
(d) Teflon
Answer:
(d) Teflon

Question 21.
Which among the following is a cross-linked polymer ?
(a) Polyesters
(b) Glycogens
(c) Melamine-formaldehde
(d) Polyvinyl chloride
Answer:
(c) Melamine-formaldehde

Question 22.
Natural rubber is a polymer of
(a) 1,1-dimethylbutadiene
(b) 2-methyl-1 3-butadiene
(c) 2-chlorobuta-1,3-diene
(d) 2-chiorobut-2-ene
Answer:
(b) 2-methyl-1 3-butadiene

Question 23.
Which of the following is not an example of rubber?
(a) Polychloroprene
(b) Buna-N
(c) Butadiene-styrene copolymer
(d) Polyacrylonitrile
Answer:
(d) Polyacrylonitrile

Question 24.
Heating rubber with sulphur is known as
(a) galvanisation
(b) bessemerisation
(c) vulcanisation
(d) sulphonation
Answer:
(c) vulcanisation

Question 25.
In vulcanization of rubber
(a) sulphur reacts to form a new compound
(b) sulphur cross-links are introduced
(c) sulphur forms a very thin protective layer over rubber
(d) all statements are correct.
Answer:
(b) sulphur cross-links are introduced

Question 26.
Which of the following represents chloroprene, the monomer of neoprene ?

Answer:
(c)

Question 27.
Buna-N is used in making oil seals and tank linings, etc. because
(a) it is resistant to the action of lubricating oil and organic solvents
(b) it is more elastic than natural rubber
(c) it can be stretched twice its length
(d) it does not melt at high temperatures.
Answer:
(a) it is resistant to the action of lubricating oil and organic solvents

Question 28.
Synthetic biopolymer, PHB V is made up of the following monomers,
(a) 3-hydroxybutanoic acid +3-hydroxypentanoic acid
(b) 2-hydroxybutanoic acid + 2-hydroxypropanoic acid
(c) 3-chlorobutanoic acid + 3-chloropentanoic acid
(d) 2-chlorobutanoic acid + 3-methlpentanoic acid.
Answer:
(a) 3-hydroxybutanoic acid +3-hydroxypentanoic acid

Question 29.
Which of the following is a biodegradable synthetic polymer ?
(a) Aliphatic polyesters
(b) PHBV
(c) Nylon-2-nylon-2
(d) All of these
Answer:
(a) Aliphatic polyesters

Question 30.
The monomers of biodegradable polymer, nylon 2-nylon 6 are
(a) glycine + adipic acid
(b) glycol + phthalic acid
(c) phenol + urea
(d) glycine + amino caproic acid.
Answer:
(d) glycine + amino caproic acid.

Question 31.
Few polymers are matched with their uses. Point out the wrong match.
(a) Polyesters – Fabric, tyre cords, safety belts
(b) Nylon 6 – Ropes, tyree cords, fabrics
(c) Bakelite – Packaging industry, lubricant
(d) Teflon – Oil seals, gaskets, non-stick utensils
Answer:
(c) Bakelite – Packaging industry, lubricant

Question 32.
Glyptal polymer is obtained by the following monomers,
(a) malonic acid + ethylene glycol
(b) phthalic acid + ethylene glycol
(c) maleic acid + formaldehyde
(d) acetic acid + phenol.
Answer:
(b) phthalic acid + ethylene glycol

Question 33.
Mark the incorrect use of the polymer.
(a) High density – Buckets, pipes, polythene
(b) Nylon 6,6 – Ropes, bristles for brushes
(c) Orion – Synthetic wool, carpets
(d) Glyptal – Electrical swithches, combs
Answer:
(d) Glyptal – Electrical swithches, combs

Question 34.
Which of the following polymers of glucose is stored by animals ?
(a) Cellulose
(b) Amylose
(c) Amylopectin
(d) Glycogen
Answer:
(d) Glycogen

Question 35.
Which of the following is not a semi-synthetic polymer ?
(a) Cis-Polyisoprene
(b) Cellulose nitrate
(c) Cellulose acetate
(d) Vulcanised rubber
Answer:
(a) Cis-Polyisoprene

Question 36.
The commercial name of polyacrylonitrile is
(a) dacron
(b) orlon (acrilan)
(c) PVC
(d) bakelite
Answer:
(c) PVC

Question 37.
Which of the following statements is not true about low density polythene ?
(a) Tough
(b) Hard
(c) Poor conductor of electricity
(d) Highly branched structure
Answer:
(b) Hard

Question 38.

is a polymer having monomer units________

Answer:
(a)

Question 39.
Which of the following polymers can be formed by using the following monomer unit ?

(a) Nylon-6,6
(b) Nylon-2-nylon-6
(c) Melamine polymer
(d) Nylon-6
Answer:
(d) Nylon-6

Question 40.
Which of the following polymers, need atleast one diene monomer for their preparation ?
(a) Dacron
(b) Novolac
(c) Neoprene
(d) Teflon
Answer:
(c) Neoprene

Question 41.
Which of the following polymers are used as fibre ?
(a) Nylon
(b) Polytetrafluoroethane
(c) Terylene
(d) Buna – S
Answer:
(a) Nylon