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प्रश्न
Which of the following statements is not true about low-density polythene?
विकल्प
Tough
Hard
Poor conductor of electricity
Highly branched structure
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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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संबंधित प्रश्न
How are polythene and neoprene prepared?
Write the molecular formula and structural formula of BHA and BHT.
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Write the mechanism of free radical polymerization of ethene.
Write chemical reaction to prepare the Dextron polymer:
Dextron
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.
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: Olefinic monomers undergo addition polymerisation.
Reason: Polymerisation of vinyl chloride is initiated by peroxides/ persulphates.
Assertion: Polytetrafluoroethene is used in making non-stick cookwares.
Reason: Fluorine has highest electronegativity.
By which reaction ethene is obtained from ethyne?
The Ziegler Natta catalyst are
Which of the following is chain-growth polymer?
Which one of the following polymers are prepared by addition polymerisation?
\[\ce{X + C + Cl2 ->[High temperature][of about 1000 K] Y + CO}\];
\[\ce{Y + 2H2O -> Z + 2HCl}\]
Compound Y is found in polymeric chain structure and is an electron-deficient Molecule. Y must be:
Which of the following statements about low density polythene is false?
