If N1, N2, N3,.... are the number of molecules with molecular masses M1, M2, M3..... respectively, then mass average molecular mass is expressed.
1.
2.
3.
4.
A copolymer of vinyl chloride and vinyl acetate is called:
1. Vinylon
2. Saran
3. Dynel
4. Orlon
In vulcanisation of rubber:
(1) Sulphur reacts to form new compound.
(2) Sulphur cross-links are introduced which resists wear and tear due to friction.
(3) Sulphur forms a very thin protective layer over rubber.
(4) All of the above.
The starting materials of PCTFE are:
(1) monochloro trifluoro ethylene
(2) tetrafluoroethylene
(3) vinyl chloride
(4) styrene
Chemical name of melamine is:
(1) 2,4-diamino-1,3,5-triazine
(2) 2-amino-1,3,5-triazine
(3) 2,4,6-triamino-1,3,5-triazine
(4) 1,3,5-triamino-2,4,6-triazine
The abbreviation PDI refers to:
(1) name of the polymer
(2) polydispersity index of polymer
(3) application of polymer
(4) poly diagonal index
Caprolactam can be obtained from:
(1) benzaldehyde
(2) cyclohexane
(3) benzophenone
(4) adipic acid
The monomer units of silicons a water repellant, acid resistant and heat resistant polymer is:
1. Si
2. SiO2
3. R2SiO
4. None of these
A polymer of acrylonitrile is called:
1. Saran
2. Orlon
3. Dacron
4. Tetron
Which one of the following pairs is not correctly matched?
1. Terylene—condensation polymer of terephthalic acid and ethylene glycol
2. Teflon—thermally stable cross-linked polymer of phenol and formaldehyde
3. Perspex—a homopolymer of methyl methacrylate
4. Synthetic rubber —a copolymer of butadiene and styrene