Chemistry Objective Questions and Answers: Polymers
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Multiple Choice Questions
(a) Polymers do not carry any charge
(b) Polymers have high viscosity
(c) Polymers scatter light
(d) Polymers have low molecular weight
Show Answer & Explanation
Answer: (d) Polymers have low molecular weight
Explanation:
1. Polymers are macromolecules with very high molecular masses (usually above 10000 u).
2. So the statement about low molecular weight is false.
Teacher's Note:
1. Identify the key concept in the question first, then check each option against it.
2. Learn the exceptions to general trends, as they are the most common source of questions.
(a) DNA
(b) Cellulose
(c) ATP
(d) Urease
Show Answer & Explanation
Answer: (c) ATP
Explanation:
1. DNA (nucleotides), cellulose (glucose) and the enzyme urease (amino acids) are biopolymers.
2. ATP is a single small nucleotide molecule.
Teacher's Note:
1. Identify the key concept in the question first, then check each option against it.
2. Learn the exceptions to general trends, as they are the most common source of questions.
(a) a synthetic plastic
(b) natural rubber
(c) natural silk
(d) artificial silk
Show Answer & Explanation
Answer: (d) artificial silk
Explanation:
1. Rayon is regenerated cellulose fibre, also called artificial or viscose silk.
Teacher's Note:
1. Identify the key concept in the question first, then check each option against it.
2. Learn the exceptions to general trends, as they are the most common source of questions.
(a) polyester
(b) polyamide
(c) polyacid
(d) polysaccharide
Show Answer & Explanation
Answer: (b) polyamide
Explanation:
1. Silk is a protein fibre (fibroin); proteins contain amide (peptide) linkages, so it is a polyamide.
Teacher's Note:
1. Identify the key concept in the question first, then check each option against it.
2. Learn the exceptions to general trends, as they are the most common source of questions.
(a) Cellulose acetate
(b) Polyvinyl chloride
(c) Cellulose nitrate
(d) Both (a) and (c)
Show Answer & Explanation
Answer: (d) Both (a) and (c)
Explanation:
1. Cellulose acetate and cellulose nitrate are made by chemically modifying natural cellulose.
2. PVC is fully synthetic.
Teacher's Note:
1. Identify the key concept in the question first, then check each option against it.
2. Learn the exceptions to general trends, as they are the most common source of questions.
(a) Polythene
(b) PVC
(c) Neoprene
(d) Bakelite
Show Answer & Explanation
Answer: (d) Bakelite
Explanation:
1. Bakelite forms a rigid cross-linked network on heating and cannot be remoulded, so it is thermosetting.
2. Polythene and PVC are thermoplastics and neoprene is an elastomer.
Teacher's Note:
1. Identify the key concept in the question first, then check each option against it.
2. Learn the exceptions to general trends, as they are the most common source of questions.
(a) thermoplastic
(b) thermosetting plastic
(c) both (a) and (b)
(d) none of the above
Show Answer & Explanation
Answer: (b) thermosetting plastic
Explanation:
1. Thermosetting plastics have extensively cross-linked network structures, which is why they cannot be softened again.
Teacher's Note:
1. Identify the key concept in the question first, then check each option against it.
2. Learn the exceptions to general trends, as they are the most common source of questions.
(a) free radical polymerisation
(b) cationic polymerisation
(c) anionic polymerisation
(d) Ziegler-Natta polymerisation
Show Answer & Explanation
Answer: (a) free radical polymerisation
Explanation:
1. Ethene at high pressure (1000-2000 atm) and about 350-570 K with a peroxide initiator undergoes free radical polymerisation giving branched LDPE.
Teacher's Note:
1. Identify the key concept in the question first, then check each option against it.
2. Learn the exceptions to general trends, as they are the most common source of questions.
(a) \( \ce{CHF=CH2} \)
(b) \( \ce{CF2=CF2} \)
(c) \( \ce{CHCl=CHCl} \)
(d) \( \ce{CHF=CHCl} \)
Show Answer & Explanation
Answer: (b) \( \ce{CF2=CF2} \)
Explanation:
1. Teflon is polytetrafluoroethene, formed from \( \ce{CF2=CF2} \) with a persulphate catalyst.
Teacher's Note:
1. Identify the key concept in the question first, then check each option against it.
2. Learn the exceptions to general trends, as they are the most common source of questions.
(a) styrene
(b) tetrafluoroethylene
(c) vinyl chloride
(d) acrylonitrile
Show Answer & Explanation
Answer: (d) acrylonitrile
Explanation:
1. Orlon (acrilan) is polyacrylonitrile, made from \( \ce{CH2=CH-CN} \).
Teacher's Note:
1. Identify the key concept in the question first, then check each option against it.
2. Learn the exceptions to general trends, as they are the most common source of questions.
(a) Peroxide catalyst
(b) Ziegler-Natta catalyst
(c) Wilkinson's catalyst
(d) Pd catalyst
Show Answer & Explanation
Answer: (b) Ziegler-Natta catalyst
Explanation:
1. HDPE is formed at 333-343 K and 6-7 atm using the Ziegler-Natta catalyst, \( \ce{TiCl4 + Al(C2H5)3} \).
Teacher's Note:
1. Identify the key concept in the question first, then check each option against it.
2. Learn the exceptions to general trends, as they are the most common source of questions.
(a) Artificial silk is derived from cellulose
(b) Nylon-66 is an example of an elastomer
(c) The repeat unit in natural rubber is isoprene
(d) Starch and cellulose are both polymers of glucose
Show Answer & Explanation
Answer: (b) Nylon-66 is an example of an elastomer
Explanation:
1. Nylon-66 is a polyamide fibre, not an elastomer. The other statements are true.
Teacher's Note:
1. Identify the key concept in the question first, then check each option against it.
2. Learn the exceptions to general trends, as they are the most common source of questions.
(a) terylene
(b) teflon
(c) glyptal
(d) nylon-6
Show Answer & Explanation
Answer: (d) nylon-6
Explanation:
1. Heating caprolactam with a little water gives nylon-6 by ring-opening polymerisation.
Teacher's Note:
1. Identify the key concept in the question first, then check each option against it.
2. Learn the exceptions to general trends, as they are the most common source of questions.
(a) melamine and tetrafluoroethane
(b) malonic acid and hexamethylenediamine
(c) melamine and vinyl acetate
(d) melamine and formaldehyde
Show Answer & Explanation
Answer: (d) melamine and formaldehyde
Explanation:
1. Melamine and formaldehyde undergo condensation to a cross-linked polymer used for crockery.
Teacher's Note:
1. Identify the key concept in the question first, then check each option against it.
2. Learn the exceptions to general trends, as they are the most common source of questions.
(a) \( \ce{(CH2OH)2} \)
(b) \( \ce{CH3CHO} \)
(c) \( \ce{CH3COCH3} \)
(d) HCHO
Show Answer & Explanation
Answer: (d) HCHO
Explanation:
1. Phenol and formaldehyde condense (with acid or base) to novolac and then bakelite.
Teacher's Note:
1. Identify the key concept in the question first, then check each option against it.
2. Learn the exceptions to general trends, as they are the most common source of questions.
(a) teflon
(b) nylon-6,6
(c) polystyrene
(d) natural rubber
Show Answer & Explanation
Answer: (b) nylon-6,6
Explanation:
1. Nylon-6,6 has amide groups (N-H and C=O) that form hydrogen bonds between chains.
2. The others have only weak van der Waals forces.
Teacher's Note:
1. Identify the key concept in the question first, then check each option against it.
2. Learn the exceptions to general trends, as they are the most common source of questions.
(a) \( \ce{-[NH(CH2)6NHCO(CH2)4CO]-} \)
(b) \( \ce{-[CO(CH2)5NH]-} \)
(c) \( \ce{-[CO(CH2)6NH]-} \)
(d) \( \ce{-[CO(CH2)4NH]-} \)
Show Answer & Explanation
Answer: (b) \( \ce{-[CO(CH2)5NH]-} \)
Explanation:
1. Caprolactam has six carbons including the carbonyl carbon; its ring opening gives \( \ce{-[NH-(CH2)5-CO]-} \).
Teacher's Note:
1. Identify the key concept in the question first, then check each option against it.
2. Learn the exceptions to general trends, as they are the most common source of questions.
(a) Bakelite
(b) Dacron
(c) Teflon
(d) PVC
Show Answer & Explanation
Answer: (a) Bakelite
Explanation:
1. Bakelite was used for gramophone records and electrical switches.
Teacher's Note:
1. Identify the key concept in the question first, then check each option against it.
2. Learn the exceptions to general trends, as they are the most common source of questions.
(a) butyl rubber
(b) Buna-S
(c) Buna-N
(d) thiokol
Show Answer & Explanation
Answer: (a) butyl rubber
Explanation:
1. Butyl rubber is made from isobutylene with a small amount of isoprene.
Teacher's Note:
1. Identify the key concept in the question first, then check each option against it.
2. Learn the exceptions to general trends, as they are the most common source of questions.
(a) Bakelite
(b) Nylon-6,6
(c) Terylene
(d) Neoprene
Show Answer & Explanation
Answer: (d) Neoprene
Explanation:
1. Neoprene is made from the single monomer chloroprene. The others are formed from two different monomers.
Teacher's Note:
1. Identify the key concept in the question first, then check each option against it.
2. Learn the exceptions to general trends, as they are the most common source of questions.
(a) Vulcanisation forms sulphur bridges between rubber chains, making rubber harder and stronger
(b) Natural rubber has trans configuration at every double bond
(c) Buna-S is a copolymer of butadiene and styrene
(d) Natural rubber is a 1,4-polymer of isoprene
Show Answer & Explanation
Answer: (b) Natural rubber has trans configuration at every double bond
Explanation:
1. Natural rubber is cis-1,4-polyisoprene (the trans polymer is gutta percha).
2. So (b) is not true.
Teacher's Note:
1. Identify the key concept in the question first, then check each option against it.
2. Learn the exceptions to general trends, as they are the most common source of questions.
(a) galvanisation
(b) vulcanisation
(c) Bessemerisation
(d) sulphonation
Show Answer & Explanation
Answer: (b) vulcanisation
Explanation:
1. Heating rubber with sulphur (about 5%) at 373-415 K forms sulphur cross-links; this is vulcanisation.
Teacher's Note:
1. Identify the key concept in the question first, then check each option against it.
2. Learn the exceptions to general trends, as they are the most common source of questions.
(a) 1,3-butadiene and styrene
(b) acrylonitrile and 1,3-butadiene
(c) acrylonitrile and isoprene
(d) chloroprene and 1,3-butadiene
Show Answer & Explanation
Answer: (b) acrylonitrile and 1,3-butadiene
Explanation:
1. Buna-N (nitrile rubber) is made from \( \ce{CH2=CH-CN} \) and \( \ce{CH2=CH-CH=CH2} \).
Teacher's Note:
1. Identify the key concept in the question first, then check each option against it.
2. Learn the exceptions to general trends, as they are the most common source of questions.
(a) Buna-S
(b) Buna-N
(c) neoprene
(d) Dacron
Show Answer & Explanation
Answer: (b) Buna-N
Explanation:
1. The copolymer of butadiene and acrylonitrile is Buna-N, resistant to petrol and oils.
Teacher's Note:
1. Identify the key concept in the question first, then check each option against it.
2. Learn the exceptions to general trends, as they are the most common source of questions.
(a) < 1
(b) > 1
(c) 1
(d) 0
Show Answer & Explanation
Answer: (b) > 1
Explanation:
1. PDI = Mw / Mn = 40000/30000 = 1.33, which is greater than 1.
2. A PDI of exactly 1 would mean all chains have the same length.
Teacher's Note:
1. Identify the key concept in the question first, then check each option against it.
2. Learn the exceptions to general trends, as they are the most common source of questions.
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Multiple Choice Questions (MCQs) for JEE Chemistry Polymers
About Polymers MCQs for JEE Chemistry
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FAQs
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By solving our JEE Chemistry Polymers MCQs Set 21, JEE students can improve their accuracy and speed which is important as objective questions provide a chance to secure 100% marks in the Chemistry.
Yes, Chemistry MCQs for JEE have answer key and brief explanations to help students understand logic behind the correct option as its important for 2026 competency-focused JEE exams.
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