Problem 12
Which of the following contains isoprene units? (a) natural rubber (b) Nylon-6, 6 (c) polyethylene (d) Dacron
Problem 13
PVC as obtained after polymerization is (a) soft and pliable (b) hard, brittle and transparent (c) hard and infuseable (d) none of these
Problem 14
Which of the following polymers does not involve cross linkages? (a) melmac (b) bakelite (c) polythene (d) vulcanized rubber
Problem 15
The compound used in the manufacture of terylene is (a) ethylene (b) vinyl chloride (c) ethylene glycol (d) adipic acid
Problem 16
The best way to prepare polyisobutylene is (a) coordination polymerization (b) free radical polymerization (c) cationic polymerization (d) anionic polymerization
Problem 17
A polymer of ethylene chloride and sodium poly sulphide is? (a) Thiokol (b) Melamine (c) Glyptal (d) Perlon \(\mathrm{L}\)
Problem 18
Which of the following is not made of polyamides? (a) nylon (b) natural silk (c) wool (d) artificial silk
Problem 19
Which one of the following is used to make nonstick cookware? (a) PVC (b) polyestyrene (c) polythene (terephthalate) (d) polytetrafluoroethylene
Problem 20
Natural rubber is a polymer of (a) butadiene (b) ethyne (c) styrene (d) isoprene
Problem 21
PVC is formed by polymerization of (a) 1 -chloroethene (b) ethane (c) propene (d) 1 -chloropropane
