Problem 66
Which of the following statement is incorrect? (1) Vinyon is a copolymer of vinyl chloride and vinyl acetate (2) Saran is a copolymer of vinyl chloride and vinylidene chloride (3) Butyl rubber in a copolymer of isobutylene and isoprene (a) 1 and 2 (b) 2 only (c) 1 only (d) none is incorrect
Problem 67
Which of the following can be remelted time and again without producing any change? (a) Bakelite (b) Urea formaldehyde resin (c) PVC (d) Melamineformaldehyderesin
Problem 68
Latex can be coagulated with? (a) \(\mathrm{CH}_{3} \mathrm{COOH}\) (b) \(\mathrm{H}_{2} \mathrm{O}\) (c) \(\mathrm{CH}_{3} \mathrm{OH}\) (d) All of these
Problem 70
In a polymer sample \(30 \%\) of molecules have a molecular mass \(20,000,40 \%\) have 30,000 and the rest \(60,000 .\) What is the weight average molecular mass of the polymer? (a) 40,300 (b) 30,600 (c) 43,333 (d) 50,400
Problem 71
Which of the following are correct here? (1) ABS plastic (2) Contains three monomers (3) A polymer of acrylonitrile, butadiene and styrene (a) 1 and 2 (b) 3 only (c) 2 only (d) 1,2 and 3
Problem 72
Which is/are correct about PMMA here (I) It is called plexiglass (II) It is hard and transparent (III) For it's formation peroxide is used (IV) It is co-polymer (a) I, II (b) II, III (c) I, II, III (d) I, II, III, IV
Problem 73
Which of the following statement is correct? (a) Vinyon is a copolymer of vinyl chloride and vinyl acetate (b) Saran is a copolymer or vinyl chloride and vinylidene chloride (c) butyl rubber in a copolymer of isobutylene and isoprene (d) all are correct
Problem 75
The monomer of the polymer (a) \(\mathrm{CH}_{3} \mathrm{CH}=\mathrm{CHCH}_{3}\) (b) \(\mathrm{CH}_{3} \mathrm{CH}=\mathrm{CH}_{2}\) (c) \(\left(\mathrm{CH}_{3}\right)_{2} \mathrm{C}=\mathrm{C}\left(\mathrm{CH}_{3}\right)_{2}\) (d) \(\mathrm{H}_{2} \mathrm{C}=\mathrm{C}\left(\mathrm{CH}_{3}\right)_{2}\)
Problem 76
Which of the following polymer can be used for lubrication and as an insulator? (a) SBR (b) PVC (c) PTFE (d) \(\mathrm{PAN}\)
Problem 77
Polyacrylonitrile, characterized by the repeating unit is made from which of the following monomer? (a) \(\mathrm{CH}_{2}=\mathrm{CHCN}\) (b) \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CN}\) (c) \(\mathrm{HOCH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{3}\) (d) \(\mathrm{CH}_{3} \mathrm{CH}=\mathrm{CHCN}\)
