Three dimensional molecules with cross links are formed in the case of a

• thermoplastic

• thermosetting plastic

• Both (a) and (b)

• None of the above

The monomers of buna-S rubber are

• vinyl chloride and sulphur

• butadiene

• styrene and butadiene

• isoprene and butadiene

The condensation polymer among the following is

• rubber

• protein

• PVC

• polythene

In Buna-S, the symbol Bu stands for

• 1-butene

• n-butene

• 2-butene

• butadiene

Orlon has monomeric unit

• acrolein

• glycol

• Vinyl cyanide

• Isoprene

'Terylene is not a

• copolymer

• polyester fibre

• chain growth polymer

• step growth polymer

347.

Which of the following is not true?

• In vulcanisation, the rubber becomes harder and stronger

• Natural rubber has 'trans' configuration at every double bond

• Buna-S is a copolymer of butene and styrene

• Natural rubber is 1, 4-polymer of isoprene

Which of the following is a polyamide?

• Nylon-6, 6

• Terylene

• Polythene

• Buna - S

Which of the following is not a biodegradable polymer?

• Glyptol

• Polyhydroxy butyrate-CO-β-hyrdoxy valerate

• PHBV

• Nylon 2-nylon-6

A polymer containing nitrogen is :

• bakelite

• dacron

• rubber

• nylon-66