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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.
| 351. |
The polymer used for coating electrical wires , cables , etc. isA. Natural rubberB. NeopreneC. Nitrile rubberD. PVC |
| Answer» Correct Answer - D | |
| 352. |
(i) Identify aliphatic biodegradable polymer which is used in packing and in orthopedic devices (ii) Write its full form (iii) Give the structures of the monomers from which it is formed ? (iv) Show the formation of the polymer |
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Answer» (i) It is represented as PHBV (ii) Its full name is, Poly`-beta-` hydroxybutrate `-CO-beta-`hydroxy valerate |
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| 353. |
Explain vulcanisation of rubber? |
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Answer» Natural rubber becomes soft at high temperatures and brittle at low temperatures. It has a high water absorption capacity. It is soluble in non-polar solvents and is non-resistant to attack by oxidizing agents. To improve upon these physical properties, the process of vulcanization is carried out. It consists of heating a mixture of raw rubber with sulphur with a temperature range between 373 K to 415 K. On vulcanisation, sulphur forms cross links at reactive sites of double bonds and thus the rubber gets stiffened. |
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| 354. |
Which kind of polymers has the same chemical structure for its repeating unit and monomer ? |
| Answer» Polymer formed by addition polymerisation has the same chemical for its repeating unit and polymers | |
| 355. |
A carbohydrate which cannto be hydrolysed to simpler compounds, is calledA. monosaccharideB. disaccharideC. trisaccharideD. polysaccharide |
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Answer» Correct Answer - B Monosaccharide is the simplest carbohydrate which cannot be hydrolyse to simpler compounds. |
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| 356. |
Which of the following structures represent the L-glucose?A. B. C. D. |
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Answer» Correct Answer - B L-glucose is the mirror image of D - glicose. |
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| 357. |
Which of the following is a natural polymer?A. CelluloseB. Buna-SC. RayonD. Nylon 6, 6 |
| Answer» Correct Answer - A | |
| 358. |
Write the names of monomers and structure used for getting the following polymers ?PMMA, PVC, Teflon |
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Answer» (i) PVC — monomer — Vinylchloride, CH2 = CH — Cl (ii) Teflon — monomer — Tetrafluoro ethylene, F2 C = CF2 (iii) PMMA — monomer — Methyl methacrylate,CH2=C(CH3)COOCH3 |
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| 359. |
Which of the following is condensation polymer?A. PolypropyleneB. PMMAC. GlyptalD. Teflon |
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Answer» Correct Answer - C |
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| 360. |
Which of the folowing are bipolymers?A. NylonB. LeatherC. BakeliteD. Orlon |
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Answer» Correct Answer - B |
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| 361. |
Polymers of the type, `X-M_(n)-Y` are called:A. TelomersB. copolymersC. elastomersD. invertomers |
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Answer» Correct Answer - A |
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| 362. |
Whichof the following polymer does not exist in geometrical isomeric forms?A. PolyisopreneB. PolyacetyleneC. PolybutadieneD. Polypropylene |
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Answer» Correct Answer - D |
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| 363. |
The polymer used in making handles of cookers and frying pans isA. BakeliteB. Nylon-2 - nylon - 6C. OrlonD. Polyvinyl chloride |
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Answer» Correct Answer - A Information |
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| 364. |
Adenosine is an example ofA. nucleotideB. uncleosideC. purine bassD. pyrimidine bass |
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Answer» Correct Answer - B Adenosine is a nuclesoside while adenosine triphosphate is a nucleoside. |
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| 365. |
A good quality of fibre is suppose to haveA. Short lengthB. Light weight per unit lengthC. High crimpD. Non flexible |
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Answer» Correct Answer - B Light weight hence easy use . |
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| 366. |
Which is not classified as thermoplastics-A. polyethyleneB. polystyreneC. bakeliteD. neoprene |
| Answer» Correct Answer - C | |
| 367. |
Which of the following is a characteristic of thermoplastics ?A. They are cross linked polymersB. They have strongest intermolecular forcesC. They get soften or melt on heatingD. All of the above |
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Answer» Correct Answer - C Thermoplastics soften or melt on heating . |
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| 368. |
Which of the followig statements are not correct?A. Polyester is not a copolymerB. Polystyrene is a thermoplasticC. Dacron is a fibreD. Natural rubber behaves as thermosetting polymer |
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Answer» Correct Answer - A::D |
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| 369. |
Which of the following is not thermoplastics?A. Cellulose acetateB. NitrocelluloseC. Polyvinyl acetateD. Phenol formaldehyde polymer |
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Answer» Correct Answer - D |
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| 370. |
Which of the following contain ethylene glycol as one of the monomers?A. MelamineB. PolystyreneC. GlyptalD. Terylene |
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Answer» Correct Answer - C::D |
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| 371. |
Vinyl polymerization may occur through intermediate formation of:A. carbocationsB. carbonionsC. free radicalsD. carbenes |
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Answer» Correct Answer - A::B::C |
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| 372. |
Which of the following polymer does not contain 1,3-butadiene as one of the monomers?A. Butyl rubberB. Nitrile rubberC. ABS rubberD. SBR |
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Answer» Correct Answer - A |
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| 373. |
Polymerization does not occur through intermediate formation of:A. carbocationsB. carbonionsC. free radicalsD. carbenes |
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Answer» Correct Answer - D |
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| 374. |
Nylon 66 is not a :A. condensation polymerB. co-polymerC. polyamideD. homopolymer |
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Answer» Correct Answer - D Nylon-66 is not a homopolymer |
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| 375. |
Identify the type of polymer (i) `-A -A -A-A-A-A-` (ii) `-A-B-B-A-A-A-B-A-`A. (i) Homopolymer, (ii) CopolymerB. (i) Natural polymer (ii) Synthetic polymerC. (i) Linear polymer , (ii) Branched polmerD. (i) Fibre , (ii) Elastomer |
| Answer» Correct Answer - A | |
| 376. |
Which type of polymer is bakelite ?A. Addition polymerB. HomopolymerC. Condensation polymerD. Biopolymer |
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Answer» Correct Answer - C Bakelite is a polymer of formaldehyde (HCHO) and phenol `(C_(6)H_(5)OH)` and formed with the loss of water molecules , it is a synthetic condensation polymer. |
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| 377. |
Among the following , a natural polymer isA. celluloseB. PVCC. polyethyleneD. Teflon |
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Answer» Correct Answer - A Cellulose is a natural polymer . |
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| 378. |
Glycogen is closely related withA. polyetheneB. teflonC. bakeliteD. starch |
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Answer» Correct Answer - D Both glycogen and starch are natural polymers (also can be biopolymer) while other are synthetic polymers. |
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| 379. |
Glycogen , a naturally occurring polymer stored in animals is aA. monosaccharideB. disaccharideC. trisaccharideD. polysaccharide |
| Answer» Correct Answer - D | |
| 380. |
Nylon- 6 is so called becauseA. It has 6 monomersB. It is formed at `6^(@)C `C. Its monomer has 6 carbon atomsD. It contains six membered ring . |
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Answer» Correct Answer - C Definition |
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| 381. |
Which of the following is not an example of addition polymer?A. PolytheneB. PolystyreneC. NeopreneD. Terylene |
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Answer» Correct Answer - D Polythene is addition polymer of ethylene . [No byproduct during polymerisation ] . |
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| 382. |
Explain whether cationic or anlonic poiymerisation takes place in the preparation of acrylonitrile. |
| Answer» The electronegative -CN group present in acrylonitrile `(CH_2 =CH-CN)` is responsible fo r the increased stability of the carbanion. Since carbanion is formed as an intermediate in both chain initiation and chain propagation, acrylonitrile should be prepared by anionic polymerisation. | |
| 383. |
Among the following a natural polymer isA. CelluloseB. PVCC. TeflonD. Polyethylene |
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Answer» Correct Answer - A Cellulose is natural fibre obtained from wood . |
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| 384. |
Which of the following is synthetic rubber?A. Buna-sB. NeopreneC. Both (a) and (b)D. None |
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Answer» Correct Answer - C Both Buna-S and Neoprene are synthetic rubber . |
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| 385. |
Compounds like ice, NaCl etc., have a sharp melting point. However polymers do not have a sharp melting point. Give reasons. |
| Answer» Polymers are formed by the combination of molecules (monomers) of different molecular weights. When polymers melt, the smaller molecules with low melting point melt first followed by the heavier molecules. Thus, the entire polymer does not melt at a fixed temperature, rather it melts in a temperature range. Hence, polymers do not have a sharp melting point. | |
| 386. |
What do you mean by polymer additive ? |
| Answer» The polymers obtained through polymerisation are virgin polymers and are not suitable for manufacturing. Hence, certain substances (like any element or organic compounds) are mixed with these polymers to make them commercially viable. Such substances are known as polymer additives. Example: Stabilisers are used to increase the stability of polymers. Plasticisers are used to increase the flexibility of polymers | |
| 387. |
Natural rubber is a polymer ofA. butadieneB. ethyneC. styreneD. isoprene |
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Answer» Correct Answer - D Polyisoprene is the natural rubber which is the polymer of isoprene. `n-[CH_(2)=underset(("Isoprene monomer"))(CH-underset(CH_(3))underset(|)C=CH_(2))-]overset("Polymerisation")to` `-[underset(("polymer"))underset("Polyisoprene (Natural rubber)" ^(n))(CH_(2)-CH=underset(CH_(3))underset(|)C-CH_(2))-]` |
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| 388. |
Terylene is a condensation polymer of ethylene glycol andA. Benzoic acidB. Phthalic acidC. Salicylic acidD. Terphthalic acid |
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Answer» Correct Answer - D Terphthalic acid with ethylene glycol gives terylene . |
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| 389. |
Terylene is a condensation polymer of ethylene glycol and:(a) Terephthalic acid(b) Phthalic acid(c) Benzoic acid(d) Acetic acid |
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Answer» (a) Terephthalic acid |
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| 390. |
In which of the following polymers ethylene glycol is one of the monomer units? |
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Answer» The correct option is (i) |
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| 391. |
Which of the following polymers are long chain and which of them are cross-linked condensation polymers? Explain. (1) Ethylene glycol (2) Glycerol (3) Terephthalic acid |
| Answer» Ethylene glycol `HO-(CH_2)_2 -OH` and terephthalic acid `(HOOC-C_6H_4 -COOH)` , each possesses two active bifunctional groups. Hence, they undergo polycondensation to form a long straight chain polymer known as polyester. Glycerol `(HOCH_2 -CHOH - CH_2OH)` contains three functional groups. Hence, polycondensation of glycerol withterephthalic acid forms a network polymer. During polycondensation, two - OH groups of glycerol react with the acid to form an ester. The remaining - OH groups hanging inthe polymer chain fo rm a polyester as a result of the polycondensation. Thus, the hanging -OH groups are bonded to the - OH groups of the adjacent polymer chain forming a cross-link and a network polymer is formed. | |
| 392. |
What are fibres ? Give example . |
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Answer» Fibres : Fibres are the thread forming solids which possess high tensile strength . E.g.:Nylon 6,6,polyesters . |
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| 393. |
What are elastomers ? |
| Answer» Elastomers are the polymers which can be stretched by applying external force and regain their original position when the stressing force is removed. | |
| 394. |
What are elastomers? Give example. |
| Answer» Elastomers: These are rubber like solids with elastic properties .In elastomers the polymer chains are held together by the weak inter molecular forces.E.g.:Buna -s,Buna -N etc. | |
| 395. |
Briefly explain (i) The main purpose of vulcanisation of rubber. (ii) What are elastomers ? Explain |
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Answer» (i) The main purpose to vulcanisation of rubber is to make it more elastic and less brittle. It also makes rubber resistant to wear & tear. (ii) For elastomers, |
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| 396. |
`~[NH (CH_(2)) NHCO (CH_(2))_(4) CO]~` is aA. homopolymerB. copolymerC. addition polymerD. thermoseting polymer |
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Answer» Correct Answer - B It is a copolymer as its repeating units are derived from two different monomers: `nH_(2)N (CH_(2)) NH_(2) + N HOOC (CH_(2))_(4) COOH underset(-nH_(2) O)overset("Polymerisation")rarr` `[-NH (CH_(2)) NHCO (CH_(2))_(4) CO -]_(n)` |
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| 397. |
Acrilan is a hard, horny and a high melting matrial. Which of the following represent its structure?A. `[{:(CH_(2)-CH-),(" "|),(" "COOC_(2)H_(5)):}]_(n)`B. `[CH_(2)-underset(CI)underset(|)(CH)]_(n)`C. `[CH_(2)-underset(CN)underset(|)(CH)]_(n)`D. `[{:(CH_(2)-overset(CH_(3))overset(|)(C)-),(" "|),(" "COOCH_(3)):}]_(n)` |
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Answer» Correct Answer - C Acilan or orlon is polyacrylonitrile `nCH_(2)=underset(CN)underset(|)(CH)overset("Polymerization")rarr[CH_(2)-underset(CN)underset(|)(CH)]_(n)` |
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| 398. |
Cellulose is a polymer ofA. glucoseB. fructoseC. riboseD. sucrose |
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Answer» Correct Answer - A Cellulose is a straight chain polysaccharide (polymer) composed by only of `beta-D-` glucose units which are joined by glycosidic linkage between `C - 1` of one glucose unit and `C4` of the next glucose unit. |
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| 399. |
Which one of the following is not correctly matched?A. Neoprene `[CH_(2)-underset(CI)underset(|)(C)=CH-CH_(2)]_(n)`B. Nylon -6,6 `[NH-(CH_(2))_(6)-NH-CO-(CH_(2))_(4)-overset(O)overset(||)(C)-O-O]_(n)`C. D. `PMMA [{:(CH_(2)-overset(CH_(3))overset(|)(C)-),(" "|),(" "COOCH_(3)):}]_(n)` |
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Answer» Correct Answer - B Nylon - 6,6 is a copolymer of hexamethyllenediamine: `{:(nH-NH(CH_(2))_(6)NH-H+nHO-overset(O)overset(||)(C)(CH_(2))_(4)-overset(O)overset(||)(C)-OH),(" "darr),(" "[NH(CH_(2))_(6)NH-overset(O)overset(||)(C)(CH_(2))_(4)overset(O)overset(||)(C)]_(n)):}` |
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| 400. |
`CH_(2)=CH_(2)` is a monomer ofA. buna-SB. teflonC. glyptalD. nylon-6 |
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Answer» Correct Answer - B `F_(2)C=CF_(2)` is a monomer of wall known plastic teflon, a material inert to almost all chemicals. `n-"["F_(2)Cundersetunderset(("Tetral-flouroethene"))("Monomer")(=CF_(2))-"]"overset("Polymerisation")underset(H_(2)O_(2),Delta)to-[underset(F)underset(|)overset(F)overset(|)C-underset(F)underset(|)overset(F)overset(|)C-]_(n)` |
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