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NEET • CHEMISTRY • POLYMERS
Polymers practice · Easy
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1
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1 of 46
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Thiokol is a
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Correct option: C
Rubber
Option C (Rubber) is correct because Thiokol is a synthetic rubber, specifically a polysulfide rubber.
2
Easy
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Which of the following type of forces are present in vulcanized rubber?
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Correct option: A
Weakest intermolecular forces
Option A (Weakest intermolecular forces) is correct because vulcanized rubber primarily relies on weak intermolecular forces for its elasticity, even with the presence of cross-linking.
3
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Which of the following is a natural polymer?
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Correct option: B
polysaccharides
Option B is correct because polysaccharides like starch and cellulose are naturally occurring polymers found in plants and animals.
4
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A homopolymer is obtained by polymerization of:
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Correct option: A
One type of monomer units
Option A (One type of monomer units) is correct because a homopolymer is defined as a polymer made from only one type of monomer.
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Assertion (A): The empirical formula of natural rubber is .
Reason (R): Natural rubber contains no conjugative double bonds.
Reason (R): Natural rubber contains no conjugative double bonds.
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Correct option: B
Both A and R are correct, but R is not the correct explanation of A
Option B (Both A and R are correct, but R is not the correct explanation of A) is correct because while both the empirical formula of natural rubber is and it lacks conjugative double bonds are true, the latter doesn't explain the former.
6
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Polyethene, PVC, Teflon and neoprene are all
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Correct option: B
Addition homopolymers
Option B (Addition homopolymers) is correct because polyethene, PVC, Teflon, and neoprene are formed by the addition polymerization of a single type of monomer.
7
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The starting materials of PCTFE are:
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Correct option: A
Monochlorotrifluoro ethylene
Option A is correct because PCTFE (Polychlorotrifluoroethylene) is made from Monochlorotrifluoroethylene.
8
Easy
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Remembering
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Rubber is heated with Sulphur and the process is known:
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Correct option: B
Vulcanization
Option B (Vulcanization) is correct because vulcanization is the process of heating rubber with sulfur to improve its strength and elasticity.
9
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Bakelite is a copolymer of:
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Correct option: B
HCHO and phenol
The correct answer is B (HCHO and phenol) because Bakelite is a thermosetting polymer formed by the condensation polymerization of formaldehyde (HCHO) and phenol.
10
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Understanding
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Which is not an example of homopolymer out of the following?
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Correct option: B
SBR
Option B (SBR) is correct because SBR (styrene-butadiene rubber) is a copolymer, not a homopolymer, as it is made from two different monomers.
11
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Low density polythene is prepared by
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Correct option: A
Free radical polymerization
Option A is correct because low-density polythene (LDPE) is produced through free radical polymerization at high pressure and temperature.
12
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Given the polymers,
A = Nylon 6.6; B=Buna –S;C= Polythene. Arrange these in increasing order of their intermolecular force (lower to higher).
A = Nylon 6.6; B=Buna –S;C= Polythene. Arrange these in increasing order of their intermolecular force (lower to higher).
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Correct option: C
Option C () is correct because the intermolecular forces increase in the order: Buna-S (weakest), Polythene, and Nylon 6,6 (strongest).
13
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Nylons, polyesters and cotton, all possess strength due to:
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Correct option: A
Intermolecule H-bonding
Option A (Intermolecule H-bonding) is correct because Nylons, polyesters, and cotton all exhibit intermolecular hydrogen bonding, contributing to their strength.
14
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Which is the best monomer for getting chain growth polymer?
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Correct option: C
Option C () is correct because the presence of the phenyl group stabilizes the propagating radical, facilitating chain growth polymerization.
15
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Natural rubber on catalytic hydrogenation gives
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Correct option: B
Atactic product
Option B (Atactic product) is correct because catalytic hydrogenation of natural rubber results in an atactic product due to the random addition of hydrogen atoms.
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16
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Bakelite is:
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Correct option: D
Thermosetting
Option D (Thermosetting) is correct because Bakelite is a thermosetting polymer, meaning it undergoes irreversible hardening upon heating.
17
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Assertion (A): Natural rubber is an elastomer.
Reason (R): The intermolecular forces of attraction between the polymer chains are weak van der Walls' forces.
Reason (R): The intermolecular forces of attraction between the polymer chains are weak van der Walls' forces.
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Correct option: A
Both A and R are correct, and R is the correct explanation of A
Option A (Both A and R are correct, and R is the correct explanation of A) is correct because natural rubber's elastomeric properties arise from the weak van der Waals forces between its polymer chains.
18
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Remembering
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Protein is a polymer of:
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Correct option: C
Amino acids
Option C (Amino acids) is correct because proteins are polymers made up of amino acid monomers linked together by peptide bonds.
19
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Nylon-66 is an example of
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Correct option: C
Polyamide
Option C is correct because Nylon-66 is a polyamide, formed by the condensation polymerization of a diamine and a dicarboxylic acid.
20
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Which of the following is an example of condensation homopolymer?
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Correct option: D
Malmac
Option C (Perlon) is correct because Perlon (Nylon-6) is a condensation homopolymer formed from caprolactam.
21
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Buna rubber is a polymer of:
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Correct option: A
1,3-butadiene
Option A (1,3-butadiene) is correct because Buna rubber is a polymer primarily made from 1,3-butadiene.
22
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Which one of the following is not a condensation polymer?
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Correct option: B
Neoprene
Option B (Neoprene) is correct because it is an addition polymer, while Dacron, Melamine, and Glyptal are condensation polymers.
23
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With increase in which of the following factors, tensile strength of a polymer increases?
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Correct option: D
All of these
Option D (All of these) is correct because crystallinity, melting point, and molecular weight all contribute to the tensile strength of a polymer.
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Assertion: Natural rubber is very elastic in nature.
Reason: The coiled structure of cis-polyisoprene is held together by Vanderwaals forces.
Reason: The coiled structure of cis-polyisoprene is held together by Vanderwaals forces.
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Correct option: A
Both assertion and reason are correct statements, and reason is the correct explanation of the assertion.
Option A (Both assertion and reason are correct statements, and reason is the correct explanation of the assertion) is correct because natural rubber's elasticity is due to the coiled structure of cis-polyisoprene held together by weak van der Waals forces.
25
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Which of the following has been used in the manufacture of non-inflammable photographic films?
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Correct option: A
Cellulose nitrate
Option D is correct because cellulose acetate is less flammable than cellulose nitrate and is used in photographic films.
26
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Rayon is
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Correct option: C
Regenerated fibre
Option C (Regenerated fibre) is correct because rayon is made from cellulose that has been chemically processed and reformed.
27
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Polymer obtained by condensation polymerisation is:
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Correct option: D
Nylon-6, 6
Option D is correct because Nylon-6,6 is formed through condensation polymerization, where a small molecule like water is eliminated during the process.
28
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Thermoplastics are:
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Correct option: D
All of the above
Option D is correct because thermoplastics are linear polymers that soften upon heating and can be molded into desired shapes.
29
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Which one among the following is a thermosetting plastic?
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Correct option: C
Bakelite
Option C is correct because Bakelite is a thermosetting plastic that undergoes irreversible hardening upon heating.
30
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Natural rubber is a polymer of:
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Correct option: B
-isoprene
Option B (-isoprene) is correct because natural rubber is a polymer formed from the cis-isoprene monomer.
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