CBSE
The condensation polymer among the following is
rubber
protein
PVC
polyethene
Consider the following reaction,
benzoic acid
salicylic acid
Phenol
Aniline
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
Which of the following statements is incorrect?
Polypropylene is a thermoplastic polymer
Melamine-formaldehyde is a thermosetting polymer
Mixture of styrene and methyl methacrylate can form ionic addition polymer
Low-density polythene is a poor conductor of electricity
An example of natural biopolymer is
teflon
nylon-66
rubber
DNA
The monomers of terylene are
phenol and formaldehyde
ethylene glycol and phthalic acid
adipic acid and hexamethylenediamine
ethylene glycol and terephthalic acid
The monomer of teflon is
CHF = CH2
CF2 = CF2
CHCl = CHCl
CHF = CHCl
Styrene can be purified by
simple distillation
fractional distillation
steam distillation
vacuum distillation
Polypropylene can be obtained by polymerisation of
CH2 CH - CH2 - Cl
CH2 CH - Cl
CH3 - Cl
CH3 - CHCl2
Heating of rubber with sulphur is called
vulcanisation
galvanisation
sulphonation
bessemerisation