A. Bakelite (phenol formaldehyde)
B. Polyester
C. Polythene
D. Nylon-6
A. 1000 to 5000
B. 5000 to 1000
C. 20000 to 25000
D. 109 to 1011
A. Bakelite
B. Teflon
C. Perspex
D. Nylon-6
A. Treylene
B. Orlon
C. Saran
D. Dacron
A. 1: 3
B. 3 : 1
C. 1 : 2
D. 2 : 1
A. Greater the degree of cross-linking in the polymer, lesser is its solubility
B. Polymers having more aliphatic character are more soluble in aliphatic solvents, while those polymers having more aromatic character are more soluble in aromatic solvents
C. Swelling tendency or solubility of polymers in a particular solvent decreases with increase in molecular weight of the solvent
D. High molecular weight polymers on dissolving gives solution of very low viscosity
A. For the manufacture of styrene, the major raw materials are benzene and ethylene
B. One important copolymer of styrene is SBR, which is widely used in the manufacture of
automobile tyres
C. Manufacture of phenol by chloroben-zene-eaustic process involves. The chlorination of benzene, causticisation and hydrolysis
D. Phenol manufacture by chlorobenzene-caustic process is competitive even when low cost chlorine is not available
A. Ductile
B. Brittle
C. Malleable
D. None of these
A. Propylene
B. Phenol & formaldehyde
C. Phenol & acetaldehyde
D. Urea & formaldehyde