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301.

To have practical applications why are cross links quetioined in rubber?

Answer» Natural rubber is very soft and in summer it becomes brittle. Moreover, it cannot withstand wear and tear. The cross linking in natural rubber is done by the prcoess of vulcanisation as a result of which sulphur atoms are introduced in the linear chains and they becomes cross linked. The vulcanised rubber is more stiff as compared to natural rubber. Moreover, it is also hard and non-sticky. its elasticity can be maintained over a wide range of temperature.
Discussion
302.

What is the structural difference between HDP and LDP? How does the structure account for different behaviour and nature hence use of polymer?

Answer» HDP (High density polythene) consists of linear chains of monomer units that are closely packed in space. That is why its density is high as compared to LDP (Low density polythene) in which the monomer chains are branched and are loosely packed. The structural difference is responsible for the two types of polythenes.
Discussion
303.

How many hydrogen bonds is/are present between pair of thymine and adenine in DNA?A. 1B. 2C. 3D. No bond occurs

Answer» Correct Answer - B
Between pair of thymine and adenine in DNA, two-hydrogen bonds are present.
Discussion
304.

The correct functional group `X` and the reagent//reaction conditions `Y` in the following scheme are .A. `X=COOCH_(3), Y=H_(2)//"Ni"//"heat"`B. `X=CONH_(2),Y=H_(2)//"Ni"//"Heat"`C. `X=CONH_(3),Y=Br_(2)//NaOH`D. `X=CN, Y=H_(2)//Ni//"heat"`

Answer» Correct Answer - A
Discussion
305.

The correct functional group `X` and the reagent//reaction conditions `Y` in the following scheme are .A. `X=COOCH_(3),Y=H_(2)//Ni//"heat"`B. `X=CONH_(2),Y=H_(2)//Ni//"heat"`C. `X=CONH_(2),Y=Br_(2)//NaOH`D. `X=CN,Y=H_(2)//Ni//"heat"`

Answer» Correct Answer - A::B::C::D
Discussion
306.

The correct functional group `X` and the reagent//reaction conditions `Y` in the following scheme are .A. (i) and (ii)B. (i),(ii) and (iii)C. (i) and (iii)D. All of these .

Answer» Correct Answer - D
Condensation polymers are formed bny condensation of diols or diammine with dicarboxylic acids. Therefore ,
X may be : `-overset(O)overset("||")(C)-OR or -overset(O)overset(||)C-NH_(2) or -C-=N`
` - overset(O)overset(||)C-OR or underset(Delta)overset(H_(2)//Ni)to-CH_(2)OH`
`-overset(O)overset(||)C-NH_(2) overset(Br_(2)//NaOH)to-NH_(2)`
`-overset(O)overset(||)C-NH_(2) underset(Delta) overset(H_(2)//Ni)to-CH_(2)-NH_(2)`
`-C-= underset(Delta)overset(H_(2)//Ni)to-CH_(2)-NH_(2)`
Discussion
307.

Which of the following structures represents the peptide chain?A. `-underset(|)overset(|)(C)-overset(H)overset(|)(N)-underset(|)overset(|)(C)-underset(|)overset(|)(C)-overset(O)overset(||)(C)-underset(H)underset(|)(N)-underset(|)overset(|)(C)-underset(|)overset(|)(C)-overset(H)overset(|)(N)-underset O underset(||)(C)-underset(|)overset(|)C-underset(|)overset(|)C-`B. `-overset(H)overset(|)N-underset(O)underset(||)C-underset(H)underset(|)C-underset(|)overset(|)C-NH-overset(O)overset(||)C-NH-`C. `-overset(H)overset(|)N-underset(O)underset(||)C-underset(|)overset(|)C-underset(|)overset(|)C-underset(|)overset(|)C-overset(H)overset(|)N-underset(|)overset(|)C-underset(|)overset(|)C-underset(|)overset(|)C-`D. `-oversetHoverset(|)N-underset(|)overset(|)C-undersetOunderset(||)C-overset(H)overset(|)N-underset(|)overset(|)C-underset(O)underset(||)C-overset(H)overset(|)N-underset(|)overset(|)C-underset(O)underset(||)C-overset(H)overset(|)N-underset(|)overset(|)C-`

Answer» Correct Answer - D
The peptide linkage `(-NH-CO-)` is formed by the condensation of amino acid molecules.
`HNH-underset(R)underset(|)CH-underset(O)underset(||)C-OH + H . NH-underset(R)underset(|)CH-underset(O)underset(||)C-OH`
`overset(-H_(2)O)rarr-HN-underset(R)underset(|)CH-underset(O)underset(||)C-NH- underset(R)underset(|)CH-underset(O)underset(||)C-`
Hence, following structure represents the peptide chain
`-overset(H)overset(|)N-underset (|)overset(|)C-underset(O)underset(||)C-overset(H)overset(|)N-underset(|)overset(|)C-underset(O)underset(||)C-overset(H)overset(|)N-underset(|)overset(|)C-overset(O)overset(||)C-`
Discussion
308.

The monomer of Buna-S are :A. Styrene and butadieneB. Isoprene and butadieneC. Vinyl chloride and sulphurD. Butadiene

Answer» Correct Answer - A
Styrene and butadiene are the monomers of natural rubber
Discussion
309.

The monomer of Buna-S are :A. B. `CH_(3)-underset(CH_(3))underset(|)(CH)-CH=CH_(2)+CH_(2)=CH-CN`C. D.

Answer» Correct Answer - C
Discussion
310.

Which of the following fibres contain amide linkage ?A. Nylon - 6B. TeryleneC. Nylon - 66D. both (a) and (b)

Answer» Correct Answer - D
Discussion
311.

Polymer which has amide linkage isA. nylon-6,6B. teryleneC. teflonD. bakelite

Answer» Correct Answer - A
Discussion
312.

(a) Write the names of the monomers of polymer used for making unbreakable crockery. (b) Write the reaction involved in the preparation of neoprene (c) Arrange the following polymers in decreasing order of intermolecular forces : PVC, Nylon 66, Natural rubber.

Answer» (a) Monomer units are of melamine and formaldehyde
(c) Nylon 66 `gt` Natural rubber `gt` PVC
Discussion
313.

Which polymer is used in the manufacture of unbreakable crockery?A. BakeliteB. Malamine resinC. DacronD. PAN

Answer» Correct Answer - B
Discussion
314.

What is a biodegradable polymer ? Give an example of a biodegradable aliphatic polyester. 

Answer»

Polymers which decomposes over a period of time due to environmental degradation by bacteria, etc are called biodegradable polymers.

e. g. PHBV
Discussion
315.

Perlon isA. rubberB. nylon 6C. TeryleneD. oxlon

Answer» Correct Answer - B
We know that , perlon I Nylon -6.
Discussion
316.

Which of the following is used in valcuization of rubber ?A. `SF_(6)`B. `CF_(4)`C. `Cl_(2)F_(2)`D. `C_(2)F_(2)`

Answer» Correct Answer - A
Vulcanised rubber has sulphur. `SF_(6)` is used as a source of sulphur is vulcanisation of rubber.
Discussion
317.

Which of the following is a polyamide ?A. TeflonB. Nylon-66C. TeryleneD. Bakelite

Answer» Correct Answer - B
Nylon-66 is a polyamide
Discussion
318.

Which type of biomolecules have some structural similarity with synthetic cpolyamides? What is similarity?

Answer» Proteins have also amide linkages in their molecules just like polymides. However, they differ in characteristics.
Discussion
319.

Which factor imparts the crytalline nature to a polymer like nylon?A. Strong intermolecular forces like hydrogen bonding between chains.B. van der Waals forces between the polymeric chainC. Close packing of the chains due to ionic bonding between the chains .D. Three- dimensional network of chains.

Answer» Correct Answer - A
Strong in intermolecular forces like hydrogen bonding lead to close pakcing of chains impart crystalline character .
Discussion
320.

Name tire polymers used in laminated sheets and give the name of monomeric unit involved in its formation.

Answer»

The polymer is urea-formaldehyde resin

Monomers: Urea: NH2CONH2

Formaldehyde: HCHO
Discussion
321.

Name the polymer used in laminating sheets and give the name of monomeric units involved in its formation

Answer» Urea-formaldehyde resins are used in laminated sheets.
Discussion
322.

Name the polymers used in laminated sheets and give the name of monomeric units involved in its formation .

Answer» Urea-formaldehyde, the monomer units are urea and formaldehyde,
Discussion
323.

The repeating unit present in nylon-6 is:A. `-[NH(CH_(2))_(6)NHCO(CH_(2))_(4)CO]`-B. `-[CO(CH_(2))_(5)NH]-`C. `-[CO(CH_(2))_(6)NH]-`D. `-[NH(CH_(2))_(4)NHCO(CH_(2))_(6)CO]-`

Answer» Correct Answer - B
Discussion
324.

Chain-growth polymerization may proceed by the following mechanism:A. free radical polymerizationB. cationic polymerizationC. anionic polymerizationD. all of the above

Answer» Correct Answer - D
Discussion
325.

The monomeric unit of teflon consists of:A. isopreneB. 2-chloro-1, 3-butadiene (chloroprene)C. butadieneD. tetrafluoroethylene

Answer» Correct Answer - D
Discussion
326.

Which one of the following class of compounds is obtained by polymerization of acetylene?A. Poly-yneB. Poly-eneC. Poly-esterD. Poly-amide

Answer» Correct Answer - B
Discussion
327.

Which of the following polymer does not contain hydrogen bonding?A. Nylon-6,6B. PolyurethanesC. KevlarD. Dacron

Answer» Correct Answer - D
Discussion
328.

Which of the statement does not explain fibres?A. Fibres are made of linear long chains which permit side-by-side alignmentB. Structures of fibres are controlled by enthalpy instead of entropyC. There exist strong intermolecular forces to prevent slipping between chainsD. Nylon and rubbers are typical examples of fibres

Answer» Correct Answer - D
Discussion
329.

Which of one of the following is classified as a copolymer?A. DacronB. polyacrylonitrileC. TeflonD. Polyvinylacetate

Answer» Correct Answer - A
Discussion
330.

Which of the following is fully fluorinted polymer?A. NeopreneB. TeflonC. ThiokolD. PVC

Answer» Correct Answer - B
Discussion
331.

The species which can best serve as an initiator for the cationary polymerization is:A. `LiAlH_(4)`B. `HNO_(3)`C. `AlCl_(3)`D. `BuLi`

Answer» Correct Answer - C
Discussion
332.

In chain growth polymerization initiator isA. free radicalsB. cationsC. anionsD. one of these

Answer» Correct Answer - D
Discussion
333.

A polymer is represented as –[-CH2-CH(C6H5)-]-n (i) Is it a homopolymer or a copolymer?(ii) Is it an addition or condensation polymer?(iii) Name the monomer of the above polymer.

Answer»

(i) Homopolymer

(ii) Addition 

(iii) Styrene
Discussion
334.

Identify the rnonomers in the following polymer:[-NH-(CH2)6-NH-CO-(CH2)4-CO-]n

Answer»

NH2-(CH2)6-NH2 and HOOC-(CH2)4-COOH

NH2-(CH2)6-NH2  - Hexamethylenediamine

HOOC-(CH2)4-COOH  - Adipic acid
Discussion
335.

`~[NH (CH_(2)) NHCO (CH_(2))_(4) CO]~` is aA. copolymerB. addition polymerC. therom-setting polymerD. homopolymer

Answer» Correct Answer - A
`-[NH(CH_(2))_(6)NHCO(CH_(2))_(4)CO-]_(n)` is a coplomer. Polmers whose repeating structural units are derived from two or more types of monomer units are called copolmer `nH_(2)N(CH_(2))_(6)NH_(2)+nHOOC(CH_(2))_(4)COOH`
`overset("Polymerisation")underset(-nH_(2)O)to-[NH(CH_(2))_(6)NHCO(CH_(2))_(4)CO-]_(n)`
Discussion
336.

How are polymers classified on the basis of molecular forces?

Answer»
  • Elastomers
  • Fibres
  • Thermoplastic
  • Thermosetting.
Discussion
337.

What does PMMA stand for?

Answer»

Poly(methyl methacrylate)
Discussion
338.

What are the disadvantages of natural rubber which are compromised by vulcanisation?

Answer»
  • It becomes more soft and sticky at high temperatures and brittle at low temperatures.
  • It has large water absorption capacity and low tensile strength and low resistance to abrasion.
  • Not resistant to action of organic solvents.
  • Easily attacked by oxygen and other oxidising agents.
Discussion
339.

Natural fibre have following disadvantages . Which is incorrect statement ?A. They are less durableB. They are not crease resistantC. They do not dry quicklyD. They are not attacked by moth

Answer» Correct Answer - D
They can be attacked by moth .
Discussion
340.

Which one of the following is a natural fibreA. starchB. celluloseC. rubberD. nylon-6

Answer» Correct Answer - B
Discussion
341.

The necessary condition for compound to form fibre isA. its molecule must be linearB. its molecular must be sphericalC. its molecule must be hexagonalD. its molecule must be trigenal

Answer» Correct Answer - A
Polymer can form long string easily .
Discussion
342.

Write the names and structure of the monomer of the following polymer :(i) Neoprene(ii) Buna-N(iii) PHBV

Answer»

Chloroprene, CH2=C(Cl)-CH=CH2

(ii) 1,3-Butadiene & Aclylonitrite

CH2:CH-CH =CH2 & CH2-CHCN

(iii) 3-Hydroxybutanoic acid and 3-Hydroxypentanoic acid CH3CH(OH)CH2COOH & CH3CH2CH(OH)
Discussion
343.

Example of addition polymer is:A. Buna-sB. BakeliteC. Nylon-6D. Malamine

Answer» Correct Answer - A
Information .
Discussion
344.

Which of the following is an example of condensation polymer ?A. NylonB. BakeliteC. Urea formaldehyde resinD. All

Answer» Correct Answer - D
During formation of all , there is a byproduct .
Discussion
345.

Wash and wear clothes are manufactured using________.A. terylene fibresB. linen C. wood fibresD. cotton mixed with nylon

Answer» Correct Answer - A
Uses of terylene
Discussion
346.

Wash and wear clothes are manufactured using________.A. terylene fibresB. linenC. wood fibresD. cotton mixed with nylon

Answer» Correct Answer - A
Uses of terylene
Discussion
347.

Hemp isA. synthetic fibreB. vegatable fibresC. animal fibreD. not a fibre

Answer» Correct Answer - B
Discussion
348.

Hemp is a kind ofA. animal fibreB. artificial fibreC. vegetable fibreD. Regenerated fibre

Answer» Correct Answer - C
It is obtained from plant .
Discussion
349.

Fibres areA. fineB. planarC. linearD. cross linked

Answer» Correct Answer - C
Definition
Discussion
350.

Draw the structure of the monomer for the following polymer:Polypropene.

Answer»

CH2=CH-CH3 (Propene) is the monomer for polypropene.
Discussion