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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.
| 751. |
The monomer unit of PVC is:A. vinyl chlroideB. ethyleneC. chloropreneD. acrylonitrile |
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Answer» Correct Answer - A |
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| 752. |
Regarding cross-linked or network polymers, which of the following statements is incorrect-A. they contain covalent bonds between various linear polymer chainsB. they are formed from bi- and tri-functional monomersC. examples are bakelite and melamineD. they contain strong covalent bonds in their polymer chains |
| Answer» Correct Answer - C | |
| 753. |
Which of the following is a monomer of teflon ?A. DifluoroethaneB. TrifluoroethaneC. TetrafluoroethaneD. None of the above |
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Answer» Correct Answer - D Teflon is an addition polymer of tetrafluoroethlene. `underset"Tetrafluoroethylene " (nF_2C=CF_2) underset"Pressure"overset"Heat"to underset"Teflon"((--F_2C-CF_2--)_n)` |
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| 754. |
Write the monomer of PVC |
| Answer» Correct Answer - `-CH_2-CH(Cl)-` | |
| 755. |
Between long chain and cross-linked polymers, which one has the highest density and melting point? |
| Answer» Correct Answer - Long chain | |
| 756. |
Which is more branched among LOPE and HOPE? |
| Answer» Correct Answer - LDPE | |
| 757. |
Write the name and structure of one of the common initiators used in free radical addition polymersations. |
| Answer» Benzoyl peroxide : `C_(6)H_(5) overset(O)overset(||)(C) - O - O - overset(O)overset(||)(C) - C_(6)H_(5)` | |
| 758. |
Name the monomer of teflon |
| Answer» Tetrafluoroethylene `(F_2C=CF_2)` | |
| 759. |
What do you mean by living polymerisation? |
| Answer» Anionic polymerisation | |
| 760. |
______ polymerisation is also known as living polymerisation. |
| Answer» Correct Answer - Anionic | |
| 761. |
What type of polymerisation is known as living polymerisation? |
| Answer» Anionic polymerisation | |
| 762. |
What type of initiators are used in the cationic and anionic addition polymerisations? |
| Answer» Lewis acids are used as initiators in cationic polymerisation whereas alkyl or aryl compounds of alkali metals are used as initiators in anionic polymerisation | |
| 763. |
Which polymerisation is referred to as living polymerisation? Why? |
| Answer» Anionic polymerisation is known as living polymerisation . | |
| 764. |
The bass adenine occurs inA. DNA onlyB. RNA onlyC. Both DNA and RNAD. protein |
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Answer» Correct Answer - C Adenine is a purine bass which is common in DNA and RNA. |
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| 765. |
Eezyme trypsin convertsA. proteins into `alpha-amino acids`B. starch into sugarC. glucose into glycogenD. `alpha- amino` acids into proteins |
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Answer» Correct Answer - A Trypsin converts proteins into `alpha-amino` acids. |
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| 766. |
A customer demanded a polybag for storing the goods he had bought but the shopkeeper handed over a paper bag instead.(a) Why the shopkeeper did not give a polybag to the customer? (b) Give two harmful effects of polythene bags. (c) What is the value associated with it? |
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Answer» (a) Plastic is non biodegradable (b) Plastic releases harmful dioxin into the air. People who work in plastic industries are at a greater risk for cancer and other diseases. Plastic bags discarded in fields decrease the productivity of fertile land, Coloured plastic bags contain harmful toxic metals like chromium and copper which can cause allergies. (c) Awareness of harmful effects of polythene bags on the environment |
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| 767. |
Carbohydrate that yield ……monosaccharide unit on hydrolysis are called oligosaccharide.A. `1 - 10`B. `2 - 10`C. `4 - 10`D. `5 - 10` |
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Answer» Correct Answer - B Carbohydrates that yleld 2- 10 monosaccharides units on hydrolysis are called oilgosaccharides. |
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| 768. |
Thermosetting plastic is an example ofA. Linear polymerB. Cross-linked polymerC. Branched chain polymerD. None of these |
| Answer» Correct Answer - 2 | |
| 769. |
Which of the following is an example of thermosetting plastic-A. nylon-6B. teryleneC. bakeliteD. polyethelene |
| Answer» Correct Answer - C | |
| 770. |
Write the names and structures of the monomers of the following polymers: (i) Buna-S (ii) Neoprene (iii) Nylon-6, 6 |
| Answer» (i) 1, 3-Butadiene, styrene (ii) Chloroprene (iii) Hexamethylene diamine and adipic acid | |
| 771. |
Which one of the following is elastomer-A. polystyreneB. neopreneC. nylon 6, 6D. bakelite |
| Answer» Correct Answer - B | |
| 772. |
Nylon-6 is :A. PolyamideB. PolyesterC. PolystyreneD. Polyvinyl |
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Answer» Correct Answer - A is the correct answer |
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| 773. |
Give two examples of biodegradable polymers? |
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Answer» (1) PHBV (2) Nylon-2, nylon-6 |
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| 774. |
Classify the following as addition and condensation polymers:Terylene, Bakelite, polyvinyl chloride, polythene |
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Answer» Addition- Poly vinyl chloride, Polythene Condensation- Terylene, Bakelite |
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| 775. |
Buna -N isA. fibresB. elastomerC. Thermosetting polymerD. Thermoplastic polymer |
| Answer» Correct Answer - B | |
| 776. |
Which of the following is not fibres ?A. Nylon-6B. nylon-66C. Nylon-2,6D. dacron |
| Answer» Correct Answer - C | |
| 777. |
Polyvinyl choride is ….. PolymerA. elastomerB. fibresC. ThermoplasticD. Thermosetting |
| Answer» Correct Answer - C | |
| 778. |
What is monomer of neoprene in the following -A. `CH_2=CH-C-=CH`B. `CH_2=CH-CH=CH_2`C. `CH_2=underset(CH_3)underset|C-CH=CH_2`D. `CH_2=undersetunderset(Cl)|C-CH=CH_2` |
| Answer» Correct Answer - D | |
| 779. |
Which one is not classified as a condensation polymer? (i) teflon (ii) Orlon (iii) Dacron (iv) NeopreneA. (i), (ii), (iv)B. (i), (ii), (iii) (iv)C. (i),(ii)D. (ii), (iv) |
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Answer» Correct Answer - A Only Dacron is a condensation polymer while the rest are addition polymers. |
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| 780. |
Give one difference between homopolymer and copolymer. |
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Answer» Homopolymer: |
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| 781. |
Which of the following is not a true polymer?(a) Ethene(b) Styrene(c) Isoprene(d) Butadiene |
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Answer» (c) Isoprene |
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| 782. |
Explain the function of sulphur in vulcanisation of rubber? Discuss the two main purpose of vulcanization of rubber. |
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Answer» Sulphur introduces sulphurbridges.So it is increaes tensile strength,elasticity and resistance to abrasion etc. (i) It makes the rubber hard. (ii) It is more elastic. (iii) It has more wear and tear resistance. |
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| 783. |
What is the role of sulpher in the vulcanization of rubber. |
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Answer» The function of sulphur is to introduce cross - limks between polymer chains there by imparting more tensil strength , elasticity and resistance to abrasion. |
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| 784. |
Vulcanization of rubber was ubtroduced byA. Cahn -IngoldB. FisherC. Charles good yearD. Newman |
| Answer» Correct Answer - C | |
| 785. |
Which percentage of sulphur is used in the vulcanization of rubber?A. 0.55B. 0.03C. 0.05D. 0.4 |
| Answer» Correct Answer - C | |
| 786. |
Teflon, styrene and neoprene are(a) Copolymer(b) Homopolymer(c) Monomer(d) Condensation polymer |
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Answer» (b) Homopolymer |
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| 787. |
What is the role of Sulphur in the vulcanization of rubber ? |
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Answer» The physical properties of rubber can be altered to suit the requirements by adding sulphur in vulcanization of rubber. The process of introducing -S-S- polysulphide crosslinks between the adjacent chains tend to limit the motion of chains relative to each other. |
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| 788. |
is `(NH-CHR-CO)_n`,a homopolymer ? a homopolymer or copolymer ? |
| Answer» It is a homopolymer because the repeating structural unit has only one type of monomer unit, i.e., `NH_2-CHR-COOH`. | |
| 789. |
`[--NH-CH(R)-oversetoverset(O)(||)C--]_n` is a -A. homopolymerB. copolymerC. condensation polymerD. addition polymer |
| Answer» Correct Answer - A::C | |
| 790. |
Is `[--NH-CH(R)-oversetoverset(O)(||)C-O--]_n` a homopolymer or copolymer? |
| Answer» Homopolymer as it a formed from a single monomer `[H_2N-CH(R )-COOH]` | |
| 791. |
Is the following polymer a homopolymers or a copolymer? Identify the monomer(s ). `[--CH_2-CH(C_6H_35)--]_n` |
| Answer» Homopolymer . Monomer : `C_6H_5CH=CH_2` | |
| 792. |
`[-overset(O)overset(||)C-(CH_2)_4-overset(O)overset(||)C-overset(H)overset(|)N-(CH_2)_6-overset(H)overset(|)N-]_n` is the formula representing forA. Nylon - 6B. Nylon - 66C. Polyester fibresD. Polyamide fibres |
| Answer» Correct Answer - B | |
| 793. |
Identify the monomers in the following polymers : `[--oversetOoverset(||)C-(CH_2)_8-oversetoverset(O)(||)C-NH-(CH_2)_6-NH--]_n` |
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Answer» The monomers are decanoic acid and hexamethylenediamine. `underset"decanoic acid"(HOOC-(CH_2)_8-COOH) " " underset"hexamethylenediamine"(H_2N-(CH_2)_6-NH_2)` |
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| 794. |
Polymer given below is `[-HN-CH_2-CONH(CH_2)_5CO]_n`A. nylon -6B. Nylon -2,6C. Nylon -6,6D. Nylon -3,6 |
| Answer» Correct Answer - B | |
| 795. |
Thermosetting polymer isA. Nylon-6B. Buna -sC. Buna-ND. Bakelite |
| Answer» Correct Answer - D | |
| 796. |
Which is the monomer of neoprene in the following?A. `CH_(2)=CH-CH-=CH`B. `CH_(2)=underset(CH_(3))underset(|)(C)-CH=CH_(2)`C. `CH_(2)=underset(Cl)underset(|)(C)-CH=CH_(2)`D. `CH_(2)=CH-CH=CH_(2)` |
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Answer» Correct Answer - C Neoprene is synthetic rubber and is a polymer of chloroprene which is chemically 2-chlorobuta-1, 3-diene `underset("2-chloro-1, 3-butandiene(Chloroprene)")(nCH_(2)-underset(Cl)underset(|)(C)-CH-CH_(2))to underset("Neoprene")([--CH_(2)-underset(C) underset(|)(C)=CH-CH_2--]_(n))` |
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| 797. |
Nylon -`66` isA. polyesterB. polyamideC. polyacrylateD. None of these |
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Answer» Correct Answer - B Nylon-6,6 is a condensation polymer of adipic acid and hexamethylene diamine . It is a polyamide |
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| 798. |
Natural rubber is a polymer of:A. 1,3-butadineB. polyamideC. isopreneD. None of the above |
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Answer» Correct Answer - C Natural rubber is a polymer of isoprene `nCH_(2)=CH-underset(CH_(3))underset(|)(C)=CH_(2) overset("Polymerisation ")to underset("Natural rubber ")([--CH_(2)-CH=underset(CH_(3))underset(|)(C)-CH_(2)--]_(n)` |
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| 799. |
Which plastic is obtained from `CHCl_(3)` as follows . `CHCl_(3)underset(SbF_(3))overset(HF)rarrXoverset(800^(@)C)rarrYoverset("polymerisation")rarr Plas tic` .A. BakeliteB. TeflonC. PolytheneD. Nylon-6,6 |
| Answer» Correct Answer - B | |
| 800. |
Homopolymers are made from (1) Only one type of monomers (2) Two different types of monomers (3) Three different types of monomers (4) Several different types of monomers |
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Answer» Homopolymers are made from only one type of monomers. |
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