945 + Interview Questions in POLYMERS IN GENERAL AWARENESS Page 10 InterviewSolution

451.	Which of the following polymer undergoes permanent change on heating and can not be reused ?A. Urea methanalB. Buna -sC. DacronD. polythene
Answer» Correct Answer - A

Discussion

452.	What are thermosetting polymers ? (a) Give synthesis of Nylon -6. (b) Wirte the synthesis of PVC
Answer» (a0 For thermosetting polymers (b) For the sythesis Nylon -6 (c) For the syntheis of PVC

Discussion

453.	Write the names and structure of the monomer of the following polymer :(i) Terylene(ii) Teflon(iii) Nylon-6,6
Answer» (i) Ethylene Glycol and Terephthalic acid HOH₂C-CH₂OH, p-HOOC-C₆H₄-COOH (ii) Tetrafluroethene, CF₂=CF₂ (iii) Hexamethylenediamine and adipic acid H₂N(CH₂)₆NH₂, HOOC(CH₂)4COOH

453.

Write the names and structure of the monomer of the following polymer :(i) Terylene(ii) Teflon(iii) Nylon-6,6

Answer»

(i) Ethylene Glycol and Terephthalic acid

HOH₂C-CH₂OH, p-HOOC-C₆H₄-COOH

(ii) Tetrafluroethene, CF₂=CF₂

(iii) Hexamethylenediamine and adipic acid

H₂N(CH₂)₆NH₂, HOOC(CH₂)4COOH

Discussion

454.	Draw the structures of the monomer of PAN.
Answer» The structures of the monomer of PAN : CH₂ = CH‐CN

454.

Draw the structures of the monomer of PAN.

Answer»

The structures of the monomer of PAN :

CH₂ = CH‐CN

Discussion

455.	Give the name of polymer which is used for making non‐ stick utensils.
Answer» Teflon(CF₂ = CF₂)

Discussion

456.	Explain the term copolymerisation and give two examples.
Answer» Copolymerisation is a process in which a mixture of more than one monomeric species is allowed to polymerise. The copolymer contains multiple units of each monomer in the chain. The examples are copolymers of 1,3-butadiene and styrene (Buna-S) and 1, 3-butadiene and acrylonitrile (Buna-N).

Discussion

457.	Name a copolymer obtained by copolymerisation of three different monomers.
Answer» Acrylonitrile - butadiene - styrene (ABS) copolymer

Discussion

458.	What is mode of free radical polymerisation in alkenes ?
Answer» It is addition polymerisation.

Discussion

459.	Pyridoxin is also known asA. Vitamin`B_(2)`B. Vitamin `B_(6)`C. Vitamin `B_(12)`D. Vitamin `B_(1)`
Answer» Correct Answer - B Pyrifoxin is also known as vitamin `B_(6)`.

Discussion

460.	Name the polymer used for making medicinal Capsule.
Answer» PHBV Polyhydroxy butyrate-CO-β-hydroxy valerated.

Discussion

461.	Which polymer is used in making electrical goods and why ?
Answer» Bakelite because of its electrical insulator property.

Discussion

462.	Write use of each orlon and Nylon-6.
Answer» Use of orlon is clothing as a substitute for wool. Nylon-6 is used as fabrics.

Discussion

463.	Explain the difference between Buna— S and Buna — N.
Answer» Buna — N is a copolymer of 1, 3-butadiene and acrylo nitrile, Buna — S is a copolymer of 1, 3-butadiene and styrene.

463.

Explain the difference between Buna— S and Buna — N.

Answer»

Buna — N is a copolymer of 1, 3-butadiene and acrylo nitrile,

Buna — S is a copolymer of 1, 3-butadiene and styrene.

Discussion

464.	Which of the following polymers are condensation polymes?A. BakeliteB. TeflonC. Butyl rubberD. Melamine formaldehyde resin
Answer» Correct Answer - A::D Bakelite and melamine formadehyde resin are condensation polymers.

Discussion

465.	Give the common name and the IUPAC name of the monomer of natural rubber.
Answer» cis-Isoprene & 2-methyl-1,3-butadiene

Discussion

466.	The commercial name of polyacrylonitrile is -A. dacronB. orionC. PVCD. bakelite
Answer» Correct Answer - B

Discussion

467.	The commercial name of polyacrylonitrile is __.A. dacronB. orion (acrilan)C. PVCD. bakelite
Answer» Correct Answer - B

Discussion

468.	Which of the following is not an example of natural polymer?A. silkB. woolC. cottonD. Nylon
Answer» Correct Answer - D

Discussion

469.	Which of the following is not a polymer ?A. StarchB. celluloseC. FructoseD. Protein
Answer» Correct Answer - C

Discussion

470.	Define the term polymerization?
Answer» The repeating structural units formed from some simple and reactive molecules (monomers) are linked together by covalent bonds. This process of formation of polymers from their respective monomers is called polymerization.

Discussion

471.	Define Elastomers?
Answer» Elastomers are rubber-like solids with elastic properties. In elastomers, the polymer chain is heldtogether by weak intermolecular forces which allow the polymer to be stretched. e.g. buna-S, buna-N neoprene.

Discussion

472.	Which is the monomer of neoprene in the following?A. `CH_(2)=underset(CH_(3))underset(\|)(C)-CH=CH_(2)`B. `CH_(2)=underset(CI)underset(\|\|)(C)-CH=CH_(2)`C. `CH_(2) = CH - C -= CH`D. `CH_(2) = CH - CH = CH_(2)`
Answer» Correct Answer - B Neoprene is formed by the radical polymerization of chloroprence: `nCH_(2)-C-underset(CI)underset(\|)(CH)=CH_(2) rarr (CH_(2)-overset(CI)overset(\|)(C)=CH-CH_(2))_(n)`

Discussion

473.	Nylon is an example ofA. PolysaccharideB. PolyamideC. PolytheneD. Polyester
Answer» Correct Answer - B Nylon, a synthetic fibre, is a polymide as it possesses amide linkage.

Discussion

474.	Which one of the following is not a condensation polymer?A. MelamineB. GlyptalC. DacronD. Neoprene
Answer» Correct Answer - D Neoprene, an addition polymer, is formed by the free radical polymerisation of chloroprene `underset("Chlorprene")(nCH_(2)=overset(CI)overset(\|)(C)-CH=CH_(2))overset("Polymerization")rarr[underset("Neoprene")(CH_(2)-overset(CI)overset(\|)(C)=CH-CH_(2))]_(n)`

Discussion

475.	Which of the following statements is false?A. Artificial silk is derived from celluloseB. Nylon - 6,6, is an example of elastomerC. The repeat unit in natural rubber is isopreneD. Both strach and cellulose are polymers of glucose
Answer» Correct Answer - B Nylon -6,6 in not an elastomer. It is a fibre on account of strong intermolecular forces like hydrogen bonding.

Discussion

476.	Which one of the following sets forms the biodegrable polymer?A. B. C. D.
Answer» Correct Answer - C It is `PHBV` which undergoes bacterial degration in the enviroment.

Discussion

477.	Of the following which one is classified as polyester polymer?A. Nylon 6,6B. TeryleneC. BakeliteD. Melamine
Answer» Correct Answer - B The Terylene fibre (Dacron) is the best known of the polyesters. It is crease - resistant and has high tensile strength It is mainly used in making wash and sugar garments, in blending with wool to provide better crease and wrinkle resistance.

Discussion

478.	Which of the following polymer is biodegradable -A. `[--CH_2-undersetunderset(Cl)\|C=CH-CH_2--]_n`B. `[--CH_2-CH=CH-CH_2-CH_2-overset(CN)overset\|CH--]_n`C. `[--O-underset(CH_3)underset\|CH-CH_2-undersetOunderset"\|\|"C-O-underset(" "CH_2CH_3)underset"\|"CH-CH_2-undersetOunderset(\|\|)C--]_n`D. `[--oversetoversetH\|N-(CH_2)_6 - oversetoversetH\|N-oversetOoverset(\|\|)C-(CH_2)_4-oversetoversetO(\|\|)C--]_n`
Answer» Correct Answer - D

Discussion

479.	Assertion : Low density polythene is used to make buckets , dustbins, bottles etc. Reason : Low density polythene consists of linear molecules and has close packing .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 - D High density polythene is used to make buckets, dustbins, bottles etc. Low density polythene has highly branched structure .

Discussion

480.	Which of the following statements is not true about low density polythene ?A. ToughB. HardC. Poor conductor of electricityD. Highly branched structure
Answer» Correct Answer - B

Discussion

481.	Which of the following statements is not true about low density polythene-A. toughB. hardC. poor conductor of electricityD. highly branched structure
Answer» Correct Answer - C

Discussion

482.	High density polythene is obtained byA. polymerisation of ethene in a hydrocarbon solvent in the presence of Ziegler - Natta catalystB. polymerisation of ethene under high pressure and temperatureC. free radical polymerisation of ethene at low temperature in presence of peroxideD. polymerisation of ethene in presence of carbon tetrachloride
Answer» Correct Answer - A

Discussion

483.	Low density polythene and high density polythene both are polymers of ethene but there is marked difference in their porperities. Explain.
Answer» Both types of polythene differ in their structures and characteristics.

Discussion

484.	Polythene is a resin obtained by polymerisation ofA. Buta dieneB. EthyleneC. lsopreneD. Propylene
Answer» Correct Answer - B `n underset("Ethylene")(CH_(2) = CH_(2)) to (underset("Polythene") (-CH_(2) - CH_(2)) ) _(n)`

Discussion

485.	In nylon-6,6, what does the designation6,6 mean?
Answer» The amine and acid parts, of the monomers (adipic acid and hexamethylene diamine which condense to give the polymer, each of them contain 6 carbons.

Discussion

486.	An example of a condensation homopolymer isA. BakeliteB. Melamine- formaldehyde resinC. Alkyl resinD. Perlon or Nylon -6
Answer» Correct Answer - D

Discussion

487.	On the basis of the source of how polymers are classified? Give one example of each?
Answer» On the basis of source polymers are classified as: (i) Natural polymers (Example: Starch, Cellulose, Portions etc.) (ii) Synthetic polymers (Example: PVC, -Nylon Teflon etc.) (iii) Semi-synthetic polymers (Example.- Rayon, Cellulose nitrate)

487.

On the basis of the source of how polymers are classified? Give one example of each?

Answer»

On the basis of source polymers are classified as:

(i) Natural polymers (Example: Starch, Cellulose, Portions etc.)

(ii) Synthetic polymers (Example: PVC, -Nylon Teflon etc.)

(iii) Semi-synthetic polymers (Example.- Rayon, Cellulose nitrate)

Discussion

488.	What is functionality of a polymer?
Answer» It is the number of bonding sites in a molecule. Functionality of styrene is one, whereas it is for adipic acid.

Discussion

489.	What thermoplastic and thermosetting polymers?
Answer» Thermoplastics are linear polymers which can be repeatedly softened on heating and hardened on cooling and hence can be repeatedly used. Ex: polythene, polypropene etc. Thermosetting polymers are on the other hand permanently setting polymers. On heating, they harden and cant be softened again. Ex: bakelite, urea-formaldehyde resin.

489.

What thermoplastic and thermosetting polymers?

Answer»

Thermoplastics are linear polymers which can be repeatedly softened on heating and hardened on cooling and hence can be repeatedly used.

Ex: polythene, polypropene etc.

Thermosetting polymers are on the other hand permanently setting polymers. On heating, they harden and cant be softened again.

Ex: bakelite, urea-formaldehyde resin.

Discussion

490.	Write differences between thermosetting and thermoplastic polymers.
Answer» Thermoplastic polymers: These are linear or slightly branched long chain molecules capable of repeatedly softening on heating and hardening on cooling. These polymers possess intermolecular forces of attraction intermediate between those in elastomers and fibres. Polythene and polystyrene are examples of thermoplastic polymers. Thermosetting polymers: These polymers are cross-linked or heavily branched molecules which on heating undergo extensive cross-linking in moulds and become infusible. These cannot be reused. Bakelite, urea formaldehyde, resins are examples of thermosetting polymers.

490.

Write differences between thermosetting and thermoplastic polymers.

Answer»

Thermoplastic polymers:
These are linear or slightly branched long chain molecules capable of repeatedly softening on heating and hardening on cooling. These polymers possess intermolecular forces of attraction intermediate between those in elastomers and fibres. Polythene and polystyrene are examples of thermoplastic polymers.

Thermosetting polymers:
These polymers are cross-linked or heavily branched molecules which on heating undergo extensive cross-linking in moulds and become infusible. These cannot be reused. Bakelite, urea formaldehyde, resins are examples of thermosetting polymers.

Discussion

491.	Which of the following pairs form same osazone?A. Glucose and fructoseB. Glucose and galactoseC. Glucose and arabinosaD. Lactose and maltose
Answer» Correct Answer - A All monosaccharides which differ in configuration at `C_(1) and C_(2)` give the same osazone. Since , glucose and fructose differ from each other only in configuation at `C_(1) and C_(2)` therefore they give the same osazone. All other options given in the questions do not satisfy this candition and hence, do not form the same osazpne.

Discussion

492.	A sample of a polymer contains 200 molecules of molecular mass `10^(3)` each, 300 molecules of molecular mass `10^(4)` each and 500 molecules each having `10^(5)` as molecular mass. Calculate `bar(M)_(N)` and `bar(M)_(W)` for the sample
Answer» `bar(M)_(n)=((200xx10^(3))+(300xx10^(4))+(500xx10^(5)))/(200+300+500)` `=((2+30+500)10^(5))/(1000)=53,200` `bar(M)_(w)=((200xx(10)^(3))^(2)+300xx(10^(4))^(2)+500xx(10^5)^(2))/(200xx10^(3)+300xx10^(4)+500xx10^(5))` `=(10^(8)(2+300+5000))/(10^(5)(2+30+500))=(10^(3)xx50302)/(532)=94,553`

Discussion

493.	Calculate the average molecular mass of a polymer sample in which 30% molecules have a molecular mass 20,000, 40% have 30,000, and rest have 60,000. Strategy: Work out number average molecular mass `(overline(M_(n)))` as well as weight average molecular mass `(bar(M_(w)))`
Answer» Considering a total of 100 molecules, the `(overline(M_(n)))` and `(overline(M_(n)))` of the sample will be: `overline(M_(n)) = (sum N_(i) M_(i))/(underset(i)sum N_(i))` `((30 xx 20,000) + (40 xx 30,000) + (30 xx 60,000))/((30 + 40 + 30))` `= 36,000` `overline(M_(n)) = (sum N_(i) M_(i)^(2))/(underset(i)sum N_(i) M_(i))` `((30)(30,000)^(2) + (40)(30,000)^(2) + (30)(60,000)^(2))/(((30 xx 20,000 + 40 xx 30,000 + 30 xx 60,000)))` `= 43,333`

Discussion

494.	Write the name of the biodegradable polymer used in orthopaedic devices.
Answer» Poly `beta`-hydroxybutyrate `-co-beta-` hydroxyvalerate

Discussion

495.	By the addition of 3% to 10% sulphur in rubberA. soft rubber is obtainedB. hard rubber is obtainedC. no change takes placeD. soluble rubber is obtained.
Answer» Correct Answer - B Addition of 3-10% sulphur to rubber , makes it hard.

Discussion

496.	Terylene is an example ofA. PolyamideB. PolyacrylateC. PolyesterD. Polypropylene
Answer» Correct Answer - C

Discussion

497.	which of the following is chain growth polymer?A. PolypropyleneB. Nylon-6, 6C. TeryleneD. Glyptal
Answer» Correct Answer - A

Discussion

498.	The chemical name of isoprene is:A. 2-methyl-1,3-butadieneB. 2-chloro-1,3-butadieneC. 2-methoxypropeneD. None of the above
Answer» Correct Answer - A 2-methyl-1, 3-butadiene is the chemical name of isoprene .

Discussion

499.	The process involving heating of rubber with sulphur is called:A. SulphonationB. VulcanisationC. BessemerisationD. Galvanisation
Answer» Correct Answer - B

Discussion

500.	Which of the following type of foces are present in vulcanised rubber ?A. Weakest intermolecular forcesB. Hydrogen bondingC. Three dimensional network of bondsD. Metallic bonding
Answer» Correct Answer - A Vulcanised rubber is highly elastic , so intermolecular forces present in it , are weakest .

Discussion

Explore topic-wise InterviewSolutions in .

Which of the following polymer undergoes permanent change on heating and can not be reused ?A. Urea methanalB. Buna -sC. DacronD. polythene

What are thermosetting polymers ? (a) Give synthesis of Nylon -6. (b) Wirte the synthesis of PVC

Write the names and structure of the monomer of the following polymer :(i) Terylene(ii) Teflon(iii) Nylon-6,6

Draw the structures of the monomer of PAN.

Give the name of polymer which is used for making non‐ stick utensils.

Explain the term copolymerisation and give two examples.

Name a copolymer obtained by copolymerisation of three different monomers.

What is mode of free radical polymerisation in alkenes ?

Pyridoxin is also known asA. Vitamin`B_(2)`B. Vitamin `B_(6)`C. Vitamin `B_(12)`D. Vitamin `B_(1)`

Name the polymer used for making medicinal Capsule.

Which polymer is used in making electrical goods and why ?

Write use of each orlon and Nylon-6.

Explain the difference between Buna— S and Buna — N.

Which of the following polymers are condensation polymes?A. BakeliteB. TeflonC. Butyl rubberD. Melamine formaldehyde resin

Give the common name and the IUPAC name of the monomer of natural rubber.

The commercial name of polyacrylonitrile is -A. dacronB. orionC. PVCD. bakelite

The commercial name of polyacrylonitrile is __.A. dacronB. orion (acrilan)C. PVCD. bakelite

Which of the following is not an example of natural polymer?A. silkB. woolC. cottonD. Nylon

Which of the following is not a polymer ?A. StarchB. celluloseC. FructoseD. Protein

Define the term polymerization?

Define Elastomers?

Which is the monomer of neoprene in the following?A. `CH_(2)=underset(CH_(3))underset(|)(C)-CH=CH_(2)`B. `CH_(2)=underset(CI)underset(||)(C)-CH=CH_(2)`C. `CH_(2) = CH - C -= CH`D. `CH_(2) = CH - CH = CH_(2)`

Nylon is an example ofA. PolysaccharideB. PolyamideC. PolytheneD. Polyester

Which one of the following is not a condensation polymer?A. MelamineB. GlyptalC. DacronD. Neoprene

Which of the following statements is false?A. Artificial silk is derived from celluloseB. Nylon - 6,6, is an example of elastomerC. The repeat unit in natural rubber is isopreneD. Both strach and cellulose are polymers of glucose

Which one of the following sets forms the biodegrable polymer?A. B. C. D.

Of the following which one is classified as polyester polymer?A. Nylon 6,6B. TeryleneC. BakeliteD. Melamine

Which of the following statements is not true about low density polythene ?A. ToughB. HardC. Poor conductor of electricityD. Highly branched structure

Which of the following statements is not true about low density polythene-A. toughB. hardC. poor conductor of electricityD. highly branched structure

Low density polythene and high density polythene both are polymers of ethene but there is marked difference in their porperities. Explain.

Polythene is a resin obtained by polymerisation ofA. Buta dieneB. EthyleneC. lsopreneD. Propylene

In nylon-6,6, what does the designation6,6 mean?

An example of a condensation homopolymer isA. BakeliteB. Melamine- formaldehyde resinC. Alkyl resinD. Perlon or Nylon -6

On the basis of the source of how polymers are classified? Give one example of each?

What is functionality of a polymer?

What thermoplastic and thermosetting polymers?

Write differences between thermosetting and thermoplastic polymers.

Which of the following pairs form same osazone?A. Glucose and fructoseB. Glucose and galactoseC. Glucose and arabinosaD. Lactose and maltose

A sample of a polymer contains 200 molecules of molecular mass `10^(3)` each, 300 molecules of molecular mass `10^(4)` each and 500 molecules each having `10^(5)` as molecular mass. Calculate `bar(M)_(N)` and `bar(M)_(W)` for the sample

Calculate the average molecular mass of a polymer sample in which 30% molecules have a molecular mass 20,000, 40% have 30,000, and rest have 60,000. Strategy: Work out number average molecular mass `(overline(M_(n)))` as well as weight average molecular mass `(bar(M_(w)))`

Write the name of the biodegradable polymer used in orthopaedic devices.

By the addition of 3% to 10% sulphur in rubberA. soft rubber is obtainedB. hard rubber is obtainedC. no change takes placeD. soluble rubber is obtained.

Terylene is an example ofA. PolyamideB. PolyacrylateC. PolyesterD. Polypropylene

which of the following is chain growth polymer?A. PolypropyleneB. Nylon-6, 6C. TeryleneD. Glyptal

The chemical name of isoprene is:A. 2-methyl-1,3-butadieneB. 2-chloro-1,3-butadieneC. 2-methoxypropeneD. None of the above

The process involving heating of rubber with sulphur is called:A. SulphonationB. VulcanisationC. BessemerisationD. Galvanisation

Which of the following type of foces are present in vulcanised rubber ?A. Weakest intermolecular forcesB. Hydrogen bondingC. Three dimensional network of bondsD. Metallic bonding