मराठी
कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान 2nd PUC Class 12

Which of the following statements is not true about low density polythene?

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प्रश्न

Which of the following statements is not true about low-density polythene?

पर्याय

  • Tough

  • Hard

  • Poor conductor of electricity

  • Highly branched structure

MCQ
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उत्तर

Poor conductor of electricity

Explanation:

Low-density polythene: It is obtained by the polymerisation of ethene under high pressure of 1000 to 2000 atmospheres at a temperature of 350 K to 570 K in the presence of traces of dioxygen or a peroxide initiator (catalyst). They are flexible in nature.

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  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 15: Polymers - Multiple Choice Questions (Type - I) [पृष्ठ २१८]

APPEARS IN

एनसीईआरटी एक्झांप्लर Chemistry Exemplar [English] Class 12
पाठ 15 Polymers
Multiple Choice Questions (Type - I) | Q 6 | पृष्ठ २१८

संबंधित प्रश्‍न

How are polythene and neoprene prepared?


Write the molecular formula and structural formula of BHA and BHT.

 


What is the role of t-butyl peroxide in the polymerization of ethene?


Which of the following is a natural polymer ? Buna-S, Proteins, PVC


Write the free radical mechanism for the polymerisation of ethene.


Out of chain growth polymerisation and step growth polymerisation, in which type will you place the following.


What is the role of benzoyl peroxide in addition polymerisation of alkenes? Explain its mode of action with the help of an example.


Why should the monomers used in addition polymerisation through free radical pathway be very pure?


Match the polymer of column I with correct monomer of column II.

Column I Column II
(i) High density polythene (a) Isoprene
(ii) Neoprene (b) Tetrafluoroethene
(iii) Natural rubber (c) Chloroprene
(iv) Teflon (d) Acrylonitrile
(v) Acrilan (e) Ethene

Match the polymers given in Column I with the preferred mode of polymerisation followed by their monomers.

Column I Column II
(i) Nylon-6,6 (a) Free radical polymerisation
(ii) PVC (b) Ziegler-Natta polymerisation or coordination polymerisation
(iii) HDP (c) Anionic polymerisation
  (d) Condensation polymerisation

Assertion: Polytetrafluoroethene is used in making non-stick cookwares.

Reason: Fluorine has highest electronegativity.


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


By which reaction ethene is obtained from ethyne?


Which one of the following can be used as monomer in a polymerisation reaction?


Which of the following is chain-growth polymer?


Which one of the following polymers is prepared by addition polymerisation? 


Orlon fibres are made up of ______.


\[\ce{X + C + Cl2 ->[High temperature][of about 1000 K] Y + CO}\];

\[\ce{Y + 2H2O -> Z + 2HCl}\]

Compound Y is found in polymeric chain structure and is an electron-deficient Molecule. Y must be:


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