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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 401. |
Few polymers are matched with their uses. Point out the wrong match .A. Polyesters- Fabric , tyre cords , safety beltsB. Nylon 6- Ropes , tyre cords , fabricsC. Bakelite -Packaging industry , lubricantD. Teflon utensils - Oil seals , gaskets , non-stick |
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Answer» Correct Answer - C Bakelite is used for making combs, phongraph records, electrical switches and handles of cooking utensils. |
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| 402. |
Name the type of reaction involved in the formation of the following polymer from their respective monomers(i) PVC.(ii) Nylon6.(iii) PHBV |
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Answer» (i) Addition (ii) Condensation/Hydrolysis (iii) Condensation |
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| 403. |
A large numberof monomers (Simple molecules) combine together to form a larger molecule ( macro molecule) called as polymer. Each polymer is made up of a repeating structural unit. A polymer is said to be homopolymer if the structural unit is derived from one type of monomer molecules. if the repeating structural unit of a polymer is derived from more than one different types of monomers, the polymer is said to a copolymer. The homopolymers as well as copolymers may be formed by addition or condensation reactions. Alekenes and dienes polymerize by additions (Chain growth) mechanism involving carbocations, carbanions or free radical intermeidates. Dienes (Chloroprene) polymerise by 1, 4 addition mechanism to give cis or trans polymers. Natural rubber is, however, cis-polyisoprene. Natural rubber is quite soft and tacky but these properties can be improved by a process called vulcanization. In contrast, bifunctional monomer molecules undergo condensation or step-growth polymerization. Polymers which can be heated and reshpaed as many times as desired are called thermoplastics (polyethene, polystyrene, PVC, teflon etc). While those which can be heated onoy once to give a particular shape are called thermosetting polymers (bakelite, melmac etc.) Chloroprene is the repeating unit in:A. polystyreneB. NeopreneC. PVCD. polythene |
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Answer» Correct Answer - B |
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| 404. |
A large numberof monomers (Simple molecules) combine together to form a larger molecule ( macro molecule) called as polymer. Each polymer is made up of a repeating structural unit. A polymer is said to be homopolymer if the structural unit is derived from one type of monomer molecules. if the repeating structural unit of a polymer is derived from more than one different types of monomers, the polymer is said to a copolymer. The homopolymers as well as copolymers may be formed by addition or condensation reactions. Alekenes and dienes polymerize by additions (Chain growth) mechanism involving carbocations, carbanions or free radical intermeidates. Dienes (Chloroprene) polymerise by 1, 4 addition mechanism to give cis or trans polymers. Natural rubber is, however, cis-polyisoprene. Natural rubber is quite soft and tacky but these properties can be improved by a process called vulcanization. In contrast, bifunctional monomer molecules undergo condensation or step-growth polymerization. Polymers which can be heated and reshpaed as many times as desired are called thermoplastics (polyethene, polystyrene, PVC, teflon etc). While those which can be heated onoy once to give a particular shape are called thermosetting polymers (bakelite, melmac etc.) Teflon, polystyrene and neoprene are all:A. copolymersB. condensation polymersC. homopolymersD. monomers |
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Answer» Correct Answer - C |
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| 405. |
Monomers are simple molecules, which combine with each other to form polymers. Each polymer has a repeating structural unit. Polymers formed the same type of monomers are called homopolymers and if two or more different repeating units (monomers) make up the polymer, it is known as a copolymer. Both homopolymers and copolymers may be formed either by addition or condensation reactions. Alkenes and diense polymerize by addition (chain growth) mechanism involving carbocations, carbanions or free radical intermediates. Diense (Chloroprene, isoprene, etc) polymerize by 1,4-addition mechanism to give cis- or trans- polymers. Natural rubber is, however, cis- polyisoprene. Natural rubber is quite soft and flexible but these properties can be improved by a process called vulcanization. In contrast, bifunctional monomer molecules undergo condensation or step-growth polymerization. Polymers which can be heated and reshaped as many times as desired are called thermoplastics (polythene, polystyrene, PVC teflon, etc.) while those which can be heated only once to give a particular shape are called thermosetting polymers (Bakelite, Melmac, etc). Propene, styrene and ethylene glycol are:A. copolymersB. condensation polymersC. homopolymersD. monomers |
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Answer» Correct Answer - D |
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| 406. |
Monomers are simple molecules, which combine with each other to form polymers. Each polymer has a repeating structural unit. Polymers formed the same type of monomers are called homopolymers and if two or more different repeating units (monomers) make up the polymer, it is known as a copolymer. Both homopolymers and copolymers may be formed either by addition or condensation reactions. Alkenes and diense polymerize by addition (chain growth) mechanism involving carbocations, carbanions or free radical intermediates. Diense (Chloroprene, isoprene, etc) polymerize by 1,4-addition mechanism to give cis- or trans- polymers. Natural rubber is, however, cis- polyisoprene. Natural rubber is quite soft and flexible but these properties can be improved by a process called vulcanization. In contrast, bifunctional monomer molecules undergo condensation or step-growth polymerization. Polymers which can be heated and reshaped as many times as desired are called thermoplastics (polythene, polystyrene, PVC teflon, etc.) while those which can be heated only once to give a particular shape are called thermosetting polymers (Bakelite, Melmac, etc). Which of the following is not a natural polymer?A. DNAB. starchC. PalmitateD. Nylon-6 6 |
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Answer» Correct Answer - C |
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| 407. |
Monomers are simple molecules, which combine with each other to form polymers. Each polymer has a repeating structural unit. Polymers formed the same type of monomers are called homopolymers and if two or more different repeating units (monomers) make up the polymer, it is known as a copolymer. Both homopolymers and copolymers may be formed either by addition or condensation reactions. Alkenes and diense polymerize by addition (chain growth) mechanism involving carbocations, carbanions or free radical intermediates. Diense (Chloroprene, isoprene, etc) polymerize by 1,4-addition mechanism to give cis- or trans- polymers. Natural rubber is, however, cis- polyisoprene. Natural rubber is quite soft and flexible but these properties can be improved by a process called vulcanization. In contrast, bifunctional monomer molecules undergo condensation or step-growth polymerization. Polymers which can be heated and reshaped as many times as desired are called thermoplastics (polythene, polystyrene, PVC teflon, etc.) while those which can be heated only once to give a particular shape are called thermosetting polymers (Bakelite, Melmac, etc). Vinyl chloride is the repeating unit in:A. polystyreneB. NeopreneC. PVCD. polyethene |
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Answer» Correct Answer - C |
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| 408. |
Which of the following is not a biopolymer? (1) Proteins (2) Nucleic acids (3) Cellulose (4) Neoprene |
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Answer» Neoprene is not a biopolymer. |
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| 409. |
The simple molecules from which a polymer is made are called (1) Monomers(2) Metamers (3) Rotamers (4) Enantiomers |
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Answer» The simple molecules from which a polymer is made are called Monomers. |
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| 410. |
Monomers are simple molecules, which combine with each other to form polymers. Each polymer has a repeating structural unit. Polymers formed the same type of monomers are called homopolymers and if two or more different repeating units (monomers) make up the polymer, it is known as a copolymer. Both homopolymers and copolymers may be formed either by addition or condensation reactions. Alkenes and diense polymerize by addition (chain growth) mechanism involving carbocations, carbanions or free radical intermediates. Diense (Chloroprene, isoprene, etc) polymerize by 1,4-addition mechanism to give cis- or trans- polymers. Natural rubber is, however, cis- polyisoprene. Natural rubber is quite soft and flexible but these properties can be improved by a process called vulcanization. In contrast, bifunctional monomer molecules undergo condensation or step-growth polymerization. Polymers which can be heated and reshaped as many times as desired are called thermoplastics (polythene, polystyrene, PVC teflon, etc.) while those which can be heated only once to give a particular shape are called thermosetting polymers (Bakelite, Melmac, etc). Which of the following are examples of homopolymers?A. SBR, glyptal, nylon-6,6B. Nylon-6, butyl rubber, styrene rubberC. Polyethene, polypropene, PVCD. Melmac, bakelite, teflon |
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Answer» Correct Answer - C |
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| 411. |
A high molecular weight molecule built from a large number of simple molecules is called a (1) Monomer (2) Isomer (3) Polymer(4) Tautomer |
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Answer» A high molecular weight molecule built from a large number of simple molecules is called a Polymer. |
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| 412. |
A high molecular weight molecule which does not contain repeating structural units is called a (1) Polymer (2) Macromolecule (3) Both 1 & 2 (4) None of the above |
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Answer» A high molecular weight molecule which does not contain repeating structural units is called a Macromolecule. |
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| 413. |
A high molecular weight molecule , made up of a large number of smaller units, is known asA. monmerB. macromoleculeC. polymerD. Both (b) and (c) |
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Answer» Correct Answer - D A molecular weight molecule , made up of a large numbe of smaller units is called polymer and it is alos known as macromolecule. However , all macromolecules are not polymers. |
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| 414. |
Which of the following polymer can be used for lubrication and as an insulator?A. SBRB. PVCC. PTFED. PAN |
| Answer» Correct Answer - C | |
| 415. |
has the monomerA. B. HCHOC. Both (1) & (2)D. None of these |
| Answer» Correct Answer - C | |
| 416. |
Which of the following contains isoprene unit ?A. Natural rubberB. Nylon-66C. BakeliteD. Orlon |
| Answer» Correct Answer - A | |
| 417. |
Assertion : Glyptal is formed by the condensation polymerisation of ethylene glycol and terephthalic acid Reason : Glyptal is used in the manufacture of paints and lacquersA. If both assertion and reason are correct and reason is correct explanation for assertionB. If both assertion and reason are correct but reason is not correct explanation for assertionC. If assertion is correct but reason is incorrectD. If assertion and reason are both incorrect |
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Answer» Correct Answer - D correct assertion : Glyptal is formed by the condensation polymerisation of ethylene glycol and phthalic acid correct reason. In Glyptal, the monomer units are linked through their functional groups |
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| 418. |
Polymers are always macromolecules but macromolecules are not always polymers. Explain. |
| Answer» In polymers, monomers which participtate may be either same (homopolymers) or different (co-polymers). These are all macromolecules in nature. Biopolymers such as starch, proteins and nucleic acids are also macromolecules. But some macromolecules like chlorophyll, haeoglobins etc. do not have any monomer units and are not polymers. | |
| 419. |
Commercial name of PTTE is-A. styreneB. glyptalC. bakeliteD. teflon |
| Answer» Correct Answer - D | |
| 420. |
Terephthalic acid and ethylene glycol undcrgo step growth polymerisation to yieldA. TeflonB. RayonC. Nylon-66D. Terylene |
| Answer» Correct Answer - D | |
| 421. |
All polymers are macromolecules, but the reverse statement is not true. Which one of the following compound supports this comment-A. polyethyleneB. polyvinyl chlorideC. chlorophyllD. polystyrene |
| Answer» Correct Answer - C | |
| 422. |
Which one of the following form polyester network on reaction with terephthalic acid-A. ethylene glycolB. propylene glycolC. glycerolD. hydroquinone |
| Answer» Correct Answer - C | |
| 423. |
Which one of the following is used for lamination of woodA. phenol-formaldehyde resinB. urea-formaldehyde resinC. melamine-formaldehyde resinD. dacron |
| Answer» Correct Answer - B | |
| 424. |
Which one of the following is called neoprene rubber-A. `[--CH_2-underset"Ph"underset|CH--]`B. `[--CH_2-undersetunderset(Cl)|CH--]_n`C. `[--CH_2-CH=CH-CH_2-CH_2-underset(CN)underset|CH--]_n`D. `[--CH_2-underset(Cl)underset|C=CH-CH_2--]_n` |
| Answer» Correct Answer - D | |
| 425. |
Neoprene is prepared fromA. isopreneB. vinyl cyanideC. chloropreneD. isobutylene |
| Answer» Correct Answer - C | |
| 426. |
Which of the following is regenerated fibre ?A. Viscose celluloseB. Acetate rayonC. Artificial silkD. all of these |
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Answer» Correct Answer - D They are obtained from cellulose by carrying out a chemical process . |
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| 427. |
Natural rubber is which type of polymer?A. Condensation of polymerB. Addition polymerC. Co-ordination polymerD. None of these |
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Answer» Correct Answer - B It is an addition polymer of isoprene due to double bond. |
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| 428. |
Terylene is a polymer of:A. Adipic acid and hexamethylene di amineB. terephthalic acid and ethylene glycolC. phenol and formaldehydeD. vinyl cyanide |
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Answer» Correct Answer - B |
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| 429. |
Which of the following is a condensation polymer?A. PolystyreneB. PANC. NepreneD. Polyethylene terephthalate |
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Answer» Correct Answer - D |
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| 430. |
Melmac is a polymer of melamine andA. glycerolB. formaldehydeC. cyclohexaneD. caprolactum |
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Answer» Correct Answer - B |
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| 431. |
Which of the following is a synthetic polymer?A. StarchB. Natural rubberC. Cellulose acetateD. Polyethylene |
| Answer» Correct Answer - D | |
| 432. |
Which of the following is Buna -NA. `-[CH_2-CH=CH-CH_2-CH_2-overset(C_6H_5)overset(|)CH]_n-`B. `-[CH_2-CH=CH-CH_2-CH_2-overset(CN)overset(|)CH]_n-`C. `-[CH_2-CH_2-CH_2-CH_2-CH_2-overset(CN)overset(|)CH]_n-`D. `-[CH_2-CH_2-CH=CH-CH_2-overset(CN)overset(|)CH]_n-` |
| Answer» Correct Answer - B | |
| 433. |
Which of the following is SBR rubberA. `-[CH_2-CH_2-CH_2-CH_2-CH_2-overset(CN)overset(|)CH]_n-`B. `-[CH_2-CH=CH-CH_2-CH_2-overset(CN)overset(|)CH]_n-`C. `-[CH_2-CH=CH-CH_2-CH_2-overset(C_6H_5)overset(|)CH]_n-`D. `-[CH_2-CH_2-CH=CH-CH_2-overset(C_6H_5)overset(|)CH]_n-` |
| Answer» Correct Answer - C | |
| 434. |
In USA terylene is known asA. tereneB. nylonC. DacronD. cronar |
| Answer» Correct Answer - C | |
| 435. |
Which of the following is styrene ?A. B. C. D. |
| Answer» Correct Answer - C | |
| 436. |
Monomer used for preparation of butyl rubber isA. B. C. D. |
| Answer» Correct Answer - B | |
| 437. |
Butyl rubber is copolymer ofA. isobutylene and vinyl chlorideB. isobytylene and chloropreneC. isobytane and chloropreneD. isobutylene and isoprene |
| Answer» Correct Answer - D | |
| 438. |
Butyl rubber isA. addition co-polymerB. condesation co-polymerC. Addition homopolymerD. condensation heteropolymer |
| Answer» Correct Answer - A | |
| 439. |
Teflon, styron and neoprene are all:A. copolymersB. condensation polymersC. homopolymersD. monomers |
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Answer» Correct Answer - C |
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| 440. |
The compound used in increasing the rigidity of rubber in tyres is-A. waxB. 1,3-butadieneC. `CaC_2`D. carbon black |
| Answer» Correct Answer - D | |
| 441. |
What is PHBV? |
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Answer» It is poly hydroxy butyrate-co-β-hydroxy valerate. It is a biodegradable polymer. |
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| 442. |
why are rubber called elastomers? |
| Answer» Rubbers are called elastomers since they behave like elastic which means that they can be stretched on applying force and regain their original shape when the stretching force is removed. | |
| 443. |
Is enzyme a polymer? |
| Answer» Enzyme is a protein and protein is the polymer of `alpha`- amino acids. Thus, enzyme is a polymer | |
| 444. |
How is the following resin intermediate prepared and which polymer is formed by this monomer unit? |
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Answer» Melamine and formaldehyde are starting materials for this intermediate. Its polymerisation gives melamine polymer. |
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| 445. |
Can nucleic acids, proteins and starch be considered as step growth polymers? |
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Answer» Yes, step growth polymers are condensation polymers and they are formed by the loss of simple molecule like water leading to the formation of high molecular mass polymers |
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| 446. |
Match the polymers given in Column I with their main applications given in Column II.Column IColumn II(i) Bakelite(a) Unbreakable crockery(ii) Low density polythene(b) Non-stick cookwares(iii) Melamine-formaldehyde resin(c) Packaging material for shock absorbance(iv) Nylon 6(d) Electrical switches(v) Polytetrafluoroethane(e) Squeeze bottles(vi) Polystyrene(f) Tyre, cords |
| Answer» (i) → (d) (ii) → (e) (iii) → (a) (iv) → (f) (v) → (b) (vi) → (c) | |
| 447. |
Match the polymers given in Column I with their commercial names given in Column II.Column IColumn II(i) Polyester of glycol and phthalic acid(a) Novolac(ii) Copolymer of 1, 3-butadiene and styrene(b) Glyptal(iii) Phenol and formaldehyde resin(c) Buna-S(iv) Polyester of glycol and terephthalic acid(d) Buna-N(v) Copolymer of 1, 3-butadiene and acrylonitrile(e) Dacron |
| Answer» (i) → (b) (ii) → (c) (iii) → (a) (iv) → (e) (v) → (d) | |
| 448. |
Match the polymers given in Column I with their chemical names given in Column II.Column IColumn II(i) Nylon 6(a) Polyvinyl chloride(ii) PVC(b) Polyacrylonitrile(iii) Acrilan(c) Polycaprolactum(iv) Natural rubber(d) Low density polythenev) LDP(e) cis-polyisoprene |
| Answer» (i) → (c) (ii) → (a) (iii) → (b) (iv) → (e) (v) → (d) | |
| 449. |
Match the polymer of column I with correct monomer of column II.Column IColumn II(i) High density polythene(a) Isoprene(ii) Neoprene(b) Tetrafluoroethene(iii) Natural rubber(c) Chloroprene(iv) Teflon(d) Acrylonitrile(v) Acrilan(e) Ethene |
| Answer» (i) → (e) (ii) → (c) (iii) → (a) (iv) → (b) (v) → (d) | |
| 450. |
Why should the monomers used in addition polymerisation through free radical pathway be very pure? |
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Answer» Pure monomers are required because even the traces of impurities may act like inhibitors which leads to the formation of polymers with shorter chain length. |
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