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प्रश्न
Vulcanisation makes rubber:
(i) more elastic
(ii) soluble in inorganic solvent
(iii) crystalline
(iv) more stiff
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उत्तर
(i) more elastic
(iv) more stiff
Explanation:
Vulcanisation makes rubber more elastic and stiff. On vulcanization sulphur forms cross-links at the reactive sites of double bonds or at their reactive allylic position and thus rubber gets stiffened.
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संबंधित प्रश्न
Write names and chemical formulae of monomers used in preparing Buna-S.
What is the role of sulphur in the vulcanisation of rubber?
Discuss the main purpose of vulcanisation of rubber.
Write names and chemical formulae of monomers used in preparing Buna-N.
Write the structure of the monomer used in the following polymer:
Buna-S
Complete the following statement by selecting the correct alternative from the choices given:
Natural rubber is a : _________
What is the role of Sulphur in the vulcanization of rubber?
Which of the following are example of synthetic rubber?
(i) Polychloroprene
(ii) Polyacrylonitrile
(iii) Buna-N
(iv) cis-polyisoprene
Match materials given in Column I with the polymers given in Column II.
| Column I | Column II |
| (i) Natural rubber latex | (a) Nylon |
| (ii) Wood laminates | (b) Neoprene |
| (iii) Ropes and fibres | (c) Dacron |
| (iv) Polyester fabric | (d) Melamine formaldehyde resins |
| (v) Synthetic rubber | (e) Urea-formaldehyde resins |
| (vi) Unbreakable crockery | (f) cis-polyisoprene |
Which one of the following monomers gives the polymer neoprene on polymerization?
The polymer of natural rubber is:-
Ebonite is:-
Which of the following is correct regarding the drawbacks of raw rubber.
Which of the following statement is CORRECT regarding the drawbacks of raw rubber?
Match List I with List II.
| List I | List II |
| (Monomer Unit) | (Polymer) |
| (a) Caprolactum | (i) Natural rubber |
| (b) 2-Chloro-1, 3-butadiene | (ii) Buna-N |
| (c) Isoprene | (iii) Nylon-6 |
| (d) Acrylonitrile | (iv) Neoprene |
Choose the correct answer from the options given below:
