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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.
| 151. |
Dacron is polymer ofA. B. C. D. `F_(2)C=CF_(2)` |
| Answer» Correct Answer - C | |
| 152. |
Assertion : Polyproplyene is an addition polymer Reason : It result because of chain growth polymerisationA. 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 - C correct reason . Propylene molecules have olefinic linkages |
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| 153. |
Polymer with low degree of polymerisation is known asA. higher polymerB. oligomerC. macromoleculesD. copolymer |
| Answer» Correct Answer - B | |
| 154. |
1,3-Butadine and styrene on polymerisation give:A. buna-SB. teryleneC. teflonD. bakelite |
| Answer» Correct Answer - A | |
| 155. |
Which of the following is not an example of rubber ?A. PolychloropreneB. Buna-NC. Butadiene-styrene copolymerD. Polyacrylonitrile |
| Answer» Correct Answer - D | |
| 156. |
Identify X and Y in the given polymerisation reactions . A. X=Bakelite, Y=NovolacB. X=Novolac, Y=MelamineC. X=Bakelite , Y=MelamineD. X=Novolac, Y=Bakelite |
| Answer» Correct Answer - D | |
| 157. |
Which of the following has ester linkage?A. NylonB. BakeliteC. TeryleneD. PVC |
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Answer» Correct Answer - C |
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| 158. |
Which of the following is a chain growth polymer?A. StarchB. Nucleic acidC. PolystyreneD. Protein |
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Answer» Correct Answer - C |
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| 159. |
Novolac on heating with formaldehyde undergoes ___________ to form an infusible solid mass called ____________ .A. polymerisation , melamineB. vulcanisation , resinC. cross-linking, bakeliteD. condensation, polystyrene |
| Answer» Correct Answer - C | |
| 160. |
Repeating units teflon isA. `-CF_3-CF_3-`B. `-CHF_2-CHF_2-`C. `-CF_2-CF_2-`D. `-CH_2-CF_2-` |
| Answer» Correct Answer - C | |
| 161. |
Assertion (A) Most of the synthetic polymers are not biodegradable Reason (R ) Polymerisation process induces toxic character in organic molecules |
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Answer» Correct Answer - D Correct reason : Most of synthetic polymers are resistant to the enviromental degradation processes |
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| 162. |
Synthetic polymers do not degrade in the environment for a long time. How can biodegradable synthetic piolymers be made. Differentiate between biopolymers and biodegradable polymers and give examples of each type. |
| Answer» Synthetic polymers are quite resistant to environmental degradable prcoesses. As a result, these are accumulated in the form of solide waste materials. These water cause acute environmental problbems and remain undergradable for very long time. The synthetic biodegradable polymers are generally aliphatic polyesters and get easily hydrolysed or degradated as a result of hydroglysis. | |
| 163. |
Acrilan is a hard, horny and a high melting mateirla. Which of the following represents its structures?A. B. C. D. |
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Answer» Correct Answer - A |
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| 164. |
Assertion (A) Network polymers are thermosetting Reason (R ) Network Polymers have high molecular mass |
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Answer» Correct Answer - A Correct explanation : Net work polymers are cross -linked and branched molecules |
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| 165. |
Assertion : Strong interparticle forces exist in thermosetting polymers. Reason : Thermosetting polymers are heavily cross linked.A. If both assertion and reason are true and reason is the correct explanation of assertion .B. If both assertion and reason are true but reason is not the correct explanation of assertion .C. If assertion is true but reason is false.D. If both assertion and reason are false. |
| Answer» Correct Answer - A | |
| 166. |
Monomer of acrilan isA. vinyl chlorideB. vinyl alcoholC. ethylene glycolD. acrylonitrile |
| Answer» Correct Answer - D | |
| 167. |
Novolac isA. cross linked polymerB. linear polymerC. addition polymerD. synthetic rubber |
| Answer» Correct Answer - B | |
| 168. |
Assertion (A): Network polymers are thermosetting. Reason (R) : Network polymers have high molar mass.A. (A) and (R ) both are correct statement but reason does not explain (A)B. (A) and (R ) both are correct statements and (R ) explains the (A)C. Both (A) and (R ) are wrong statementD. (A) is correct statement and (R ) is wrong statement |
| Answer» Correct Answer - A | |
| 169. |
Terflon is polymer ofA. `FCH=CH_2`B. CFH=CHFC. `CF_3=CF_3`D. `CF_2=CF_2` |
| Answer» Correct Answer - D | |
| 170. |
Assertion : Most of the synthetic polmers are non-biodegradable . Reason : During polymerisation , the polymers become toxic and non-biodegradable .A. If both assertion and reason are true and reason is the correct explanation of assertion .B. If both assertion and reason are true but reason is not the correct explanation of assertion .C. If assertion is true but reason is false.D. If both assertion and reason are false. |
| Answer» Correct Answer - C | |
| 171. |
Assertion (A): Most of the synthetic polymers are not biodegradable. Reason (R) : Polymerisation process induces toxic character in organic molecules.A. (A) and (R ) both are correct statement but reason does not explain (A)B. (A) and (R ) both are correct statements and (R ) explains the (A)C. Both (A) and (R ) are wrong statementD. (A) is correct statement and (R ) is wrong statement |
| Answer» Correct Answer - D | |
| 172. |
Terflon polymer monomer ofA. difluoroetheneB. fluoroetheneC. tetrafluoroethaneD. tetrafluoroethene |
| Answer» Correct Answer - D | |
| 173. |
In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices. (i) Assertion and reason both are correct statement but reason does not explain assertion. (ii) Assertion and reason both are correct statements and reason explains the assertion. (iii) Both assertion and reason are wrong statement. (iv) Assertion is correct statement and reason is wrong statement. (v) Assertion is wrong statement and reason is correct statement.Assertion : Network polymers are thermosetting.Reason : Network polymers have high molecular mass. |
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Answer» (i) Assertion and reason both are correct statement but reason does not explain assertion. |
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| 174. |
The polymer acrilan has the repeating unit .A. `-CH_2-overset(CN)overset(|)CH-`B. `-CH_2-overset(C_6H_5)overset(|)CH-`C. `-CH_2-overset(CH_3)overset(|)CH-`D. `-CH_2-overset(Cl)overset(|)CH-` |
| Answer» Correct Answer - A | |
| 175. |
Name two biodegradable polymers used in medicine. |
| Answer» Polyglycolic acid and polylactic acid are used in surgical sutures. | |
| 176. |
Which of the following is addition polymer ?A. NylonB. PVCC. TeryleneD. Bakelite |
| Answer» Correct Answer - B | |
| 177. |
In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices. (i) Assertion and reason both are correct statement but reason does not explain assertion. (ii) Assertion and reason both are correct statements and reason explains the assertion. (iii) Both assertion and reason are wrong statement. (iv) Assertion is correct statement and reason is wrong statement. (v) Assertion is wrong statement and reason is correct statement.Assertion: For making rubber synthetically, isoprene molecules are polymerised.Reason: Neoprene (a polymer of chloroprene) is a synthetic rubber. |
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Answer» (v) Assertion is wrong statement and reason is correct statement. |
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| 178. |
Which monomers are polymerised by cationic polymerisation? |
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Answer» A vinyl derivative is monomers polymerised by cationic polymerisation. |
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| 179. |
What is the function of sulphur in vulcanisation of rubber? |
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Answer» Sulphur introduces sulphur bridges. So it is become more tensile strength, ,elasticity and resistance to abrasion etc. |
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| 180. |
What are synthetic rubber ? Explain the preparation and uses of the following i) Neoprene ii) Buna -N iii) Buna -S |
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Answer» The polymer which is capable of getting stretched almost to double the length and which is also vucanizable as in the case of natural rubber is called a synthetic rubber . 1) These are homo polymers of 1,3-butadiene derivatives (or) copolymers in which one of the monomer is 1,3 Butadiene (or) its derivatives and the other is any unsaturated monomer . 2) Synthetic rubber retune to its original shape and size when the stretched force is removed E.g : Neoprene : Neoprene is formed by the free radical polymerisation of chloroprene (2-chloro 1,3 -Butadiene ) `{:(n"("CH_(2)=overset(Cl)overset(|)C-CH=CH_(2)")"overset"Polymerisation"to"("--CH_(2) overset(Cl)overset(|)C=CH-CH_(2)--")"_n),("Chloroprene"" " " Neoprene"),("2-chloro 1,3 -Butadiene"):}` Uses: 1) It has superior resistance to vegetable and animal oils. 2) It is used in the manufacture of gaskets , conveyir belts. ii) Buna -N : Buna -N is the copolymer which is formed by the polymerisation of 1,3 Butadiene and acrylonitrile. `{:(n(CH_2=CH-CH=CH_2)+n(CH_2=CH-CN)rarr"("-CH_2-CH=CH-CH_2-CH_2CH_2-overset(N)overset(|)CH-")"_n),( "1,3 Butadiene "" Acrylonitrile " "Buna -N"):}` Uses : 1) It is resistant to the action of petrol ,lubricating oil and organic solvents. 2) It is used in making oil seals, tank linling . iii) Buna -S : Buna -S is the copolymer which is formed by the polymerisation of 1,3 Butadiene and Synrene. `{:(n(CH_2=CH=CH_2)+n(CH_2=CH-C_6H_5)rarr"("-CH_2-CH=CH-CH_2-CH_2-overset(C_6H_5)overset(|)CH-")"_n),(" ""1,3 -Butadiene "" Styrene"" Buna-S"):}` 1) It is a good substitute for natural rubber. 2) It is used in manufacture of auto types. 3) it is used in manufacture of floor tiles . 4) it is used in manufacture of foot wear components , cable insultation |
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| 181. |
Differentiate between Homopolymers and Copolymers with example. |
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Answer» Homopolymers: The addition polymers formed by the repeated addition of monomer molecules possessing double or triple bonds, are known as homopolymers. E.g., nCH2 = CH2→ (CH2—CH2)-- Ethene polythene Copolymers: The polymers formed by addition polymerization of two different monomers are termed as copolymers. E.g., nCH2 = CH—CH = CH2 + nC6H5CH=CH2→-[CH2—CH = CH—CH2—CH2—CH(C6H5)]n- |
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| 182. |
Give two examples of copolymers. |
| Answer» CD Styrene-butadiene (SBR), Styrene-acrylonitrile (SAN). | |
| 183. |
Bakelite is the condensation polymer of:A. `C_(6)H_(5)OH` and caprolactumB. HCHO and phthalic acidC. `C_(6)H_(5)OH` and HCHOD. HCHO and ethylene glycol |
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Answer» Correct Answer - C |
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| 184. |
Which of the following is not an example of addition polymer?A. PolystyreneB. PolyethyleneC. PolypropyleneD. Dacron |
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Answer» Correct Answer - D |
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| 185. |
Terylene is aA. polyamideB. polyesterC. PolyethyleneD. polypropylene |
| Answer» Correct Answer - B | |
| 186. |
(a) Write reaction involved in the preparation of a biodegradable polymer. (b) Give monomer unit of synthetic rubber (neoprene) (c) Give one use of nylon-66 |
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Answer» (a) The polymer is PHBV. (b) Monomer of neoprene is 2-chloro-1, 3-butadiene also called chloroprene. Its chemical formula is : `CH_(2) = overset(Cl)overset(|)(C) - CH = CH_(2)` (c) Nylon -66 is used for making bristles of tooth brushes and climbing ropes |
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| 187. |
What is the role of sulphur in vulcanisation of natural rubber? |
| Answer» Vulcanisation of natural rubber forms cross-links between the molecules in presence of sulphur. This leads to increased hardness and resilience in rubber. Vulcanisation makes it much more abrasion resistant and thermally stable. | |
| 188. |
The widely used PVC is a polymerised product of:A. `CH_(2) = CH_(2)`B. `CH_(2) = C Cl_(2)`C. `CH_(2) Cl * CH_(2) Cl`D. `CH_(2) = CHCl` |
| Answer» Correct Answer - D | |
| 189. |
Which of the following polymers are homopolymers and which are copolymers? In each case, identify the monomer(s ). `[--NH-R_1-NH-oversetoverset(O)(||)C-R_2-oversetoverset(O)(||)C--]_n` |
| Answer» Copolymer . Monomers : `H_2N-R_1 -NH_2` and `HOOC - R_2 - COOH` | |
| 190. |
Nylon -26 isA. biodegradable polymerB. nonbiodegradable polymerC. rubberD. elastomer |
| Answer» Correct Answer - A | |
| 191. |
If`N_(1),N_(2),N_(3),……`are the number of molcules with molecular masses `M_(1),M_(2),M_(3),…`respectively ,then mass average molar mass is expressed as:A. `(SigmaN_(i)M_(i)^(2))/(SigmaN_(i)M_(i))`B. `(SigmaN_(i)M_(i))/(SigmaN_(i))`C. `(SigmaM_(i)^(2)/(SigmaN_(i)`D. `(SigmaN_(i)M_(i))/(SigmaM_(i)` |
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Answer» Correct Answer - A |
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| 192. |
Natural rubber is a polymer of:A. Trans isopreneB. Cis isopreneC. Co-cis and trans isopreneD. None of these |
| Answer» Correct Answer - B | |
| 193. |
Which of the following sets contain only copolymers?A. Melamine, Bakelite, PVCB. Buna-N, Nylon-6, PolytheneC. Buna-S, Nylon-6, 6, GlyptalD. Neoprene, Styron, Polyisoprene |
| Answer» Correct Answer - C | |
| 194. |
Assertion : The physical properties of natural rubber can be improved by vulcanisation . Reason : Neoprene is the monomer of natural rubber .A. If both assertion and reason are true and reason is the correct explanation of assertion .B. If both assertion and reason are true but reason is not the correct explanation of assertion .C. If assertion is true but reason is false.D. If both assertion and reason are false. |
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Answer» Correct Answer - C Isoprene ( 2-methyl-1,3-butadiene ) is the monomer of natural rubber . |
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| 195. |
The polymers that contain only copolymers are:A. GlyptalB. nylon-6C. nylon-6-6D. SBR |
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Answer» Correct Answer - A::C::D |
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| 196. |
Write the name and the formula of monomer of natural rubber. |
| Answer» Isoprene, `H_2C=underset(CH_3)underset|C-CH=CH_2` | |
| 197. |
Name the monomer of natural rubber |
| Answer» Isoprene (2-methyl-1, 3- butadiene). | |
| 198. |
Write the free radical mechanism for the polymersation of ethene. |
| Answer» Free radical mechanism for polumerization of ethene is initiated by organic peroxide or other reagents which decomposes to give free radicals | |
| 199. |
Polymers are made up of small molecules called monomers. Polymer which are formed by one type of monomer is called homopolymer and which are formed by more than one type of monomers are called co-polymers. Natural polymers are biodegradable whereas synthetic polymers may or may not be. Addition or chain growth polymerization involves the repeated addition of monomers to the polymer chain. The monomers are unsaturated compounds and this type of polymerization takes place by ionic (cationic or anionic) as well as free radical mechanism. Condensation or step growth polymerization involves a series of condensation reactions between twomonomers. Each monomer normally contains two functional groups. Branch chain polymers may be condensation or addition but cross linked polymers are always condensation polymers. Which of these are natural polymers?A. ProteinsB. StarchC. Nucleic acidD. All of these |
| Answer» Correct Answer - D | |
| 200. |
The formula of `C_(12) H_(26) O_(4)N_(2)` representsA. PolycaprolactumB. TeryleneC. Nylon - 6D. Nylon salt |
| Answer» Correct Answer - D | |