261. Zeigler – Natta catalyst (AlR3 – AlCl3) is used in the polymerisation of September 7, 2025 by Admin vinyl acetate vinyl chloride propylene styrene ✅ The correct answer is option C.
262. Polymethyl methacrylate (PMMA) which is also known as perspex and is produced by bulk polymerisation of methyl methacrylate is not a __________ polymer. September 7, 2025 by Admin thermoplastic thermosetting linear glass like transparent ✅ The correct answer is option B.
263. __________ practically possess no elasticity. September 7, 2025 by Admin Vulcanite or ebonite Spandex fibre Polysulphide rubber Epoxy resin ✅ The correct answer is option A.
264. Rayon is a __________ fibre. September 7, 2025 by Admin cellulosic polyamide polyester natural ✅ The correct answer is option A.
265. Properties of a polymer is affected by the September 7, 2025 by Admin chain length. intermolecular forces. branching & cross-linking. all (a), (b). ✅ The correct answer is option D.
266. The main use of butadiene is September 7, 2025 by Admin as a plasticiser for unsaturated polyester. in the manufacture of synthetic rubber. as an anti-skimming agent in paint. none of these. ✅ The correct answer is option B.
267. Bakelite is September 7, 2025 by Admin same as polytetra flouro ethylene (PTFE). an inorganic polymer. same as thermoset phenol formaldehyde. not a polymer. ✅ The correct answer is option C.
268. Condensation of bisphenol A with phosgene produces __________ which possess very good heat resistance. September 7, 2025 by Admin polyurathane polysulphone polycarbonate polyester ✅ The correct answer is option C.
269. __________ polymer is used for making unbreakable crockery. September 7, 2025 by Admin Thermoplastic Melamine Addition none of these ✅ The correct answer is option B.
270. Which of the following additives are added to plastics to make it impervious to X-rays ? September 7, 2025 by Admin Asbestos Barium salt Carborundum Phthalic acid ✅ The correct answer is option B.