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Polymers

Multiple Choice Questions

151.

Buna-N, a synthetic rubber is copolymer of

H₂C = CH - CH = CH₂ and H₅C₆ - CH = CH₂
H₂C = CH - CN and H₂C = CH - CH = CH₂
H₂C = CH - CCl = CH₂ and H₂C = CH - CH = CH₂
H₂C = CN - CN and H₂C = CH - CCl = CH₂

152.

An example of natural biopolymer is

teflon
nylon-66
rubber
DNA

153.

The condensation polymer among the following is

rubber
protein
PVC
polyethene

154.

The monomers of terylene are

phenol and formaldehyde
ethylene glycol and phthalic acid
adipic acid and hexamethylenediamine
ethylene glycol and terephthalic acid

155.

Heating of rubber with sulphur is called

vulcanisation
galvanisation
sulphonation
bessemerisation

156.

Styrene can be purified by

simple distillation
fractional distillation
steam distillation
vacuum distillation

157.

The monomer of teflon is

CHF = CH₂
CF₂ = CF₂
CHCl = CHCl
CHF = CHCl

158.

The monomer of the polymer

H₂C = C(CH₃)₂
(CH₃)₂C = C(CH₃)₂
CH₃CH = CH CH₃
CH₃CH = CH₂

159.
When addition polymerisation of ethene takes place in a hydrocarbon solvent in the presence of ziegler-Natta catalyst, it forms:

LDP

HDP

Polyacrylnitrile

Teflon

HDP

When addition polymerisation of ethene takes place in a hydrocarbon solvent in the presence of acatalyst such as zieglar Natta (triethy aluminium) and titanium tetra chloride at a temperature of 333 K to 343 Kand under a pressure of 6-7 atmospheres. It forms high density polyethene (HDP).