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CBSE Questions for Class 12 Engineering Chemistry Polymers Quiz 3 - MCQExams.com
CBSE
Class 12 Engineering Chemistry
Polymers
Quiz 3
Which one of the following is not a condensation polymer?
Report Question
0%
Dacron
0%
Neoprene
0%
Melamine
0%
Glyptal
Explanation
Neoprene is not a condensation polymer. It is an addition polymer.
Neoprene is made from monomer chloroprene (2-chlorobuta-1,3-diene).
Dacron, Melamine and Glyptal are condensation polymers.
Dacron ( also known as terylene) is a polyester made by condensation polymerisation of ethylene glycol and dimethyl terephthalate.
Glyptal is a copolymer of ethylene glycol and phthalic acid.
Melamine ( or formaldehyde melamine polymer) is obtained from condensation polymerisation of melamine with formaldehyde.
To make gloves for an electrician, the material that is most suitable is rubber. Which material has most similar properties?
Report Question
0%
MO1
0%
MO2
0%
MO3
0%
All of the above
Explanation
Material must not be heavy.
Material must be strong enough for long time stability.
Material should be Opaque.
Material must not conduct heat and electricity as precaution is very important.
Material should be flexible so that electrician can work easily.
Material should be malleable i.e. can be moulded.
Nylon-66 is a _____.
Report Question
0%
natural polymer
0%
synthetic polymer
0%
mixed polymer
0%
polyester
Explanation
Nylon-66 is a synthetic polymer. It is a polyamide. The monomers are hexamethylenediamine and adipic acid.
Strength of synthetic fibre is better during-
Report Question
0%
dry condition
0%
wet condition
0%
humid condition
0%
never
Nylon is made by:
Report Question
0%
polymerization of polymers
0%
polymerization of monomers
0%
condensation co-polymers
0%
hydrolysis of polymer
Which of the following is a blended fibre?
Report Question
0%
Polycot
0%
Polyester
0%
Terylene
0%
Elastane
Adipic acid is used in the preparation of:
Report Question
0%
Nylon
−
6
0%
Dacron
0%
Nylon
−
66
0%
Navolac
Explanation
Nylon-
66
is a polymer of hexamethylene diamine and adipic acid.
Which polymer among the following does not soften on heating?
Report Question
0%
Bakelite
0%
Polythene
0%
Polystyrene
0%
PVC
Explanation
Bakelite is a highly cross-linked thermosetting polymer. It does not soften on heating because it is heat resistant in nature. Remaining other polymers are thermoplastics which gets soften on heating.
So, answer is A.
The two monomers used in the preparation of dextron are:
Report Question
0%
3-hydroxy butanoic acid and 3-hydroxy pentanoic acid.
0%
ϵ
amino caproic acid and glycine.
0%
isobutylene and isoprene.
0%
lactic acid and glycolic acid.
Explanation
Dextron is a polyacetic acid polyglycolic acid polymer. The monomers used are lactic acid and glycolic acid. It is copolymer and has ester linkage. It is used as friction modifier. It is added to lubricants to reduce surface friction.
Polymers may also be made up of :
Report Question
0%
Cellulose acetate
0%
Coal
0%
Crude oil
0%
All of the above
Explanation
Polymers are made of repeat units derived from natural gas or coal or crude oil. But building block repeat units can sometimes be made from renewable materials such as polylactic acid from corn or cellulosics from cotton linters. Some plastics have always been made from renewable materials such as cellulose acetate used for screwdriver handles and gift ribbon.
Fishing nets are made of
Report Question
0%
rayon
0%
dacron
0%
nylon
0%
viscose rayon
Explanation
Nylon
is strong enough to bear heavy weights, extend and then regain its original shape and length, making it very resourceful in
fishing nets
and also durable.
Nylon-
6
,
6
is a:
Report Question
0%
polyester
0%
polyamide
0%
polyacrylate
0%
none of the above
Explanation
E
x
p
l
a
n
a
t
i
o
n
:
The monomer of Nylon-6,6 polymer is hexamethylenediamine and adipic acid
. The
hexamethylenediamine and adipic acid undergo condensation polymerisation to give Nylon-6,6 as follow:
H
O
O
C
−
(
C
H
2
)
−
C
O
O
H
+
H
2
N
−
(
C
H
2
)
6
−
N
H
2
→
p
o
l
y
m
e
r
i
s
a
t
i
o
n
−
[
−
C
O
−
(
C
H
2
)
4
C
O
−
N
H
−
(
C
H
2
)
6
−
N
H
−
]
−
Amine and carboxylic group forms amide linkage as present in the
N
y
l
o
n
−
6
,
6
.
Therefore, Option
B
is correct answer.
C
o
r
r
e
c
t
O
p
t
i
o
n
:
B
The natural rubber is the polymer of:
Report Question
0%
1, 3-butadiene
0%
polyamide
0%
isoprene
0%
none of the above
Explanation
The monomer of natural rubber is Isoprene. Polyisoprene, a polymer of isoprene (C5H8) that is the primary chemical constituent of natural rubber.
The chemical structure of isoprene can be represented as CH2=C(CH3)—CH=CH2.
Dacron is polymer of:
Report Question
0%
glycol and formaldehyde
0%
glycol and phenol
0%
glycol and phthalic acid
0%
glycol and terephthalic acid
Explanation
Dacron, also known as Terylene; a polymer formed from polymerization of ethylene glycol and Terephthalic acid.
Option D is correct.
Synthetic polymer that resembles natural rubber is:
Report Question
0%
chloroprene
0%
isoprene
0%
neoprene
0%
glyptal
In vulcanisation of rubber,
Report Question
0%
sulphur reacts to form new compound
0%
sulphur cross links are introduced
0%
sulphur forms a very thin protective layer over rubber
0%
All of the above.
Explanation
In vulcanisation of rubber, sulphur cross links are introduced. Natural rubber is mixed with 3 to 5% sulphur and heated at
100
−
150
o
C
to form cross linking of cis-1,4 polyisoprene chains through disulphide bonds (-S-S-) . Vulcanization of rubber makes it more strong, tough and elastic.
The condensation polymer among the following is:
Report Question
0%
rubber
0%
protein
0%
poly vinyl chloride
0%
polyethene
Explanation
Proteins are polymers of
amino acids
covalently linked through
peptide bonds
into a chain. These are formed by removal of water molecule and through condensation reaction.
PVC, rubber and polyethene are formed through addition polymerisation.
Heating of rubber with sulphur is called
Report Question
0%
Vulcanisation
0%
Galvanisation
0%
Sulphonation
0%
Bessemerisation
Explanation
Vulcanization
is a chemical process for converting natural rubber or related polymers into more durable materials via the addition of sulfur or other equivalent curatives or accelerators. These additives modify the polymer by forming cross-links.
Which of the following statements about low density polythene is FALSE ?
Report Question
0%
It is a poor conductor of electricity
0%
Its synthesis requires dioxygen or a peroxide initiator as a catalyst
0%
It is used in the manufacture of buckets, dust-bins etc.
0%
Its synthesis requires high pressure
Explanation
Low density polythene is a poor conductor of electricity. For the preparation of this low density polythene dioxygen or a peroxide initiator is used as a catalyst and its synthesis requires high pressure but it is not used in preparation of buckets, dust-bins etc. The preparation of Low density polythene is exothermic process.
So, answer is C.
Which of the following is an example of condensation polymers.
Report Question
0%
Polythene
0%
PVC
0%
Orlon
0%
Terylene
Explanation
Condensation polymers are any kind of polymers formed through a condensation reaction, where molecules join together and lose small molecules as by-products such as water or methanol.
Polyethylene is made by the addition polymerization of ethylene (olefin) monomers.
Polyvinyl chloride is produced by polymerization of the vinyl chloride monomer.
Orlon is a polymer of vinyl cyanide. It is made by the addition of acrylonitrile molecules.
Terylene is a synthetic polyester fiber produced by polymerizing ethylene glycol and terephthalic acid with the removal of water.
Hence, option
D
is the answer.
Which of the following is a branched polymer?
Report Question
0%
Low density polymer
0%
Polyester
0%
High density polymer
0%
Nylon
Explanation
Low density polythene has highly branched structure. Where as high density polythene, polyester and nylon are linear polymers.
Hence, option
A
is the answer.
Which polymer among the following polymers does NOT soften on heating?
Report Question
0%
Bakelite
0%
Polythene
0%
Polystyrene
0%
PVC
Explanation
Thermoplastics:
A plastic material, which can be repeatedly melted-molded again and again by simple heating, is called a thermoplastic. Thermoplastics become soft and moldable on heating. They can then be recast in different shapes and cooled. On cooling the thermoplastic material hardens.
Polyethylene, polystyrene and PVC are examples.
Thermosetting plastics:
A plastic material, which cannot be repeatedly melted-molded again, is called a thermosetting plastic.thermosetting plastics do not become soft on heating and they do not change their shape on heating.
Bakelite is one example of a thermosetting plastic.
Which of the following statements is incorrect?
Report Question
0%
Polypropylene is a thermoplastic polymer
0%
Melamine-formaldehyde is a thermosetting polymer
0%
Mixture of styrene and methyl methacrylate can form ionic addition polymer
0%
Low density polythene is a poor conductor of electricity
Explanation
Mixture of styrene and methyl methacrylate can form a copolymer and not an ionic addition polymer. Hence, the statement in option is incorrect.
Other statements are correct.
The polymer used in making handles of cookers and frying pans is :
Report Question
0%
bakelite
0%
nylon-2-nylon-6
0%
orlon
0%
polyvinyl chloride
Explanation
The polymer used in making handles of cookers and frying pans is Bakelite. It is also used in making switches, combs etc. It is phenol formaldehyde polymer.
Cellulose, protein and starch are classified as:
Report Question
0%
natural polymers
0%
aldehydes
0%
esters
0%
synthetic polymers
Explanation
Cellulose, protein and starch are classified as natural polymers. They are obtained from either plants or animals. They are named as plant polymers and animal polymers. Other examples of natural polymers include jute, linen, silk and wool etc.
Which type of polymer is the Buna-S-rubber?
Report Question
0%
Homo polymer
0%
Condensation polymer
0%
Copolymer
0%
None of the above
Explanation
Buna-S Rubber: It is a random co-polymer formed by the emulsion polymerisation of a mixture of 1,3 butadiene and styrene in the presence of peroxide catalyst at 5 degree Celsius and therefore the product is called as cold rubber.
Copolymer is the right answer.
Which one of the following statements is wrong?
Report Question
0%
The repeating monomer units in bakelite are phenol and formaldehyde
0%
Low density polythene is an example of branched chain polymers
0%
Homopolymer contains a single type of monomer
0%
Vulcanizatoin is the process of heating natural rubber with carbon
Explanation
Vulcanization is the of heating natural rubber with sulphur in order to develop some specific qualities such as abrasion resistance, heat resistance and elasticity.
Hence, it is an incorrect statement.
Find out the approximate amount of polythene formed from
20
kg of calcium carbide from the following reactions.
C
a
C
2
+
2
H
2
O
→
C
a
(
O
H
)
2
+
C
2
H
2
H
C
≡
C
H
+
H
2
P
d
⋅
B
a
S
O
4
→
C
H
2
=
C
H
2
n
C
H
2
=
C
H
2
→
(
−
C
H
2
−
C
H
2
−
)
n
P
o
l
y
t
h
e
n
e
Report Question
0%
6
g
0%
9
kg
0%
26
kg
0%
29
kg
Explanation
Molecular weight of
C
a
C
2
=
40
+
2
×
12
=
64
∵
64
kg of
C
a
C
2
gives
=
24
+
4
=
28
kg of ethene.
∴
20
kg of
C
a
C
2
will give
=
28
64
×
20
=
7
×
20
16
=
35
4
=
8.75
=
9
kg polythene.
According to the equation,
n
C
H
2
=
C
H
2
→
(
−
C
H
2
−
C
H
2
−
)
n
.
When
100
g of ethylene polymerises to polyethylene, then the weight of polyethylene produced will be:
Report Question
0%
n
2
g
0%
100
g
0%
100
n
g
0%
100
n
g
Explanation
According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.
Here all the ethylene molecules are converted into polyethylene.
Hence, 100 g of ethylene will form 100 gm of polyethylene.
Hence, option B is correct,
Which one of the following is the structure of polyacrylonitrile ?
Report Question
0%
(
−
C
H
2
−
C
|
C
l
H
−
)
n
0%
(
−
C
H
2
−
C
|
H
C
N
−
)
n
0%
(
−
C
H
2
−
C
l
|
C
|
C
l
−
)
n
0%
(
−
C
H
2
−
C
N
|
C
|
C
O
O
C
H
3
−
)
n
Explanation
n
C
H
2
=
C
|
H
C
N
A
c
r
y
l
o
n
t
r
i
l
e
P
o
l
y
m
e
r
i
s
a
t
i
o
n
→
(
−
C
H
2
−
C
|
H
C
N
P
o
l
y
a
c
r
y
l
o
n
i
t
r
i
l
e
−
)
n
Polyacrylonitrile (PAN), a synthetic resin prepared by the polymerization of acrylonitrile.
Hence, option B is correct.
Which of the following type of forces are present in vulcanized rubber?
Report Question
0%
Weakest intermolecular forces
0%
Hydrogen bonding
0%
Three dimensional network of bonds
0%
Metallic bonding
Explanation
Vulcanised rubber is highly elastic, so weakest intermolecular forces present in it.
Which of the following is not polyamide?
Report Question
0%
Nylon-66
0%
Protein
0%
Glyptal
0%
Nylon-6
Explanation
Polyamides possess amide linkage, and they are prepared by the condensation polymerisatio of diamines with dicarboxylic acids or condensation of amino acids or their lactams (cyclic amide).
Nylon 66 is a type of polyamide made of two monomers each containing 6 carbon atoms, hexamethylenediamine and adipic acid.
Nylon-6 is a polyamide made from a monomer called caprolactam.
Proteins are polymers made out of amino acids. Hence, a polyamide.
Glyptal is a polyester, is formed by ethylene glycol and phthalic acid by step-growth polymerization.
Hence, option
C
is the answer.
Isoprene is a valuable substance for making:
Report Question
0%
Propene
0%
Liquid fuel
0%
Synthetic rubber
0%
Petrol
Explanation
Rubber is a polymer of isoprene. Its chemical formula is
(
C
5
H
8
)
n
.So, we can use it to synthesize rubber.
Hence, option
C
is correct.
Compound(B) is:
Report Question
0%
B
r
(
C
H
2
)
6
N
H
2
0%
N
C
(
C
H
2
)
4
C
N
0%
N
C
(
C
H
2
)
4
C
H
O
0%
O
H
C
(
C
H
2
)
6
C
H
O
Select the option that correctly identifies the chemical bonds present in the given biomolecules.
Polysaccharides - A, Proteins - B, Fats - C, Water - D
Report Question
0%
A - Ester,B - Peptide, C - Glycosidic, D - Hydrogen
0%
A - Glycosidic, B - Peptide, C - Ester, D - Hydrogen
0%
A - Glycosidic, B - Peptide, C - Hydrogen, D - Ester
0%
A - Hydrogen, B - Ester, C - Peptide, D - Glycosidic
Explanation
In polysaccharides, monosaccharides are linked together by glycosidic bond
(
C
−
O
−
C
)
. It is formed by dehydration between two carbon atoms of two adjacent monosaccharides.
Water has hydrogen bonding as the hydrogen atoms of one water molecule are attracted towards the oxygen atom of a neighboring water molecule.
Amino acids in a protein are linked through peptide bonds whereas ester bond is present in fats .
So, the correct answer is 'A - Glycosidic, B - Peptide, C - Ester, D - Hydrogen'.
Orion and Acrilan are fibres of well-known textile materials of the same name. They are copolymers of:
Report Question
0%
styrene and butadiene
0%
alcohol and ester
0%
acrylonitrile and 2-vinylpyridine
0%
methane and acetone
Explanation
Orlon is also known as polyacrylonitrile hence is the copolymer of acrylonitrile.
Acrilan is also a copolymer of acrylonitrile.
Which of the following happens in initiation step of the free radical polymerisation?
Report Question
0%
Decomposition of initiator
0%
Renewal of inhibitor
0%
Addition of monomer molecules to the growing chains
0%
Disproportionation
To solve the problem of looking bald, human hair wigs are worn which are very expensive. Synthetic wigs are made from a copolymer of vinyl chloride and acrylonitrile called:
Report Question
0%
dynel
0%
cellulose
0%
polyacrylonitrile
0%
PVC (or polyvinyl chloride)
Explanation
Hair wigs made of
a copolymer
of vinyl chloride and acrylonitrile called Dynel or
Modacrylic
.
'Guttapercha' is a tough, crystalline, thermoplastic. It is:
Report Question
0%
an isomer of natural rubber
0%
a synthetic rubber
0%
a type of nylon sheet
0%
the thread of terylene
Explanation
Guttapercha is a tough plastic substance obtained from the latex of several trees.
Guttapercha is also called as polyterpene- a polymer of isoprene or polyisoprene. Guttapercha is a thermoplastic of natural rubber (isoprene).
It is an excellent non-conductor and is used in insulating marine and underground cables.
'Buna-N rubber' is a coploymer of butadiene and acrylonitrile. In comparison to natural rubber it:
Report Question
0%
is delicate and soft
0%
has better resistance to wear and tear
0%
is a poor substitute for natural rubber
0%
does not last for a long time
Explanation
Synthetic rubber is more resistant to acids, oils, heat, aging and has more strength than natural rubber.
Natural rubber is obtained as 'latex', which is a milky, white fluid from rubber trees. Latex is a:
Report Question
0%
mixture of rubber and gum
0%
colloidal dispersion of rubber in water
0%
solution of rubber in water
0%
paste of rubber, clay and water
Explanation
Natural rubber latex is basically a colloidal dispersion of rubber hydrocarbon in an aqueous medium. Ammonium and potassium alums are used as a coagulant in latex.
Acetaldehyde can be used for making synthetic:
Report Question
0%
protein
0%
perfumes
0%
rubbers
0%
sugar
Explanation
Acetaldehyde is primarily used as an intermediate in the manufacture of a range of chemicals, perfumes, aniline dyes, plastic and synthetic rubber, etc.
∴
Answer is option
B
and
C
.
Teflon (tetrafluoroethylene) is a black material used in non-stick pans for frying chips and vegetables. The oil or butter does not stick at all. In the process of manufacture, one of the technical problems is:
Report Question
0%
to make teflon stick to the metal of the pan
0%
to make teflon that is non-sticky
0%
to make teflon
0%
to cut a round sheet of teflon that exactly fits
Explanation
Teflon even when melted do not flow instead it behaves as a gel due to absence of crystalline phase and high melting point so manufactures finds a bit difficulty to make teflon stick to metal of pan.
Teflon, a polymer of tetrafluoroethylene, is an excellent plastic material for films and coatings. Which of the following is not the property of Teflon?
Report Question
0%
It is unaltered by radiation
0%
It can withstand high temperatures
0%
It is one of the most chemically-resistant plastic in the world
0%
It is an ideal insulator for high-frequency fittings
Explanation
P
T
F
E
(Poly tetra fluoro ethylene) is very sensitive and is therefore not suitable for applications involving exposure of any radiation as it will degrade.
The basic chemical building block of natural rubber obtained from trees is:
Report Question
0%
acetylene
0%
vinyl chloride
0%
isoprene
0%
neoprene
Explanation
Isoprene was first isolated by decomposition of natural rubber. About
95
%
isoprene production is used to produce cis-polyisoprene - a synthetic version of natural rubber. Natural rubber consists mainly of poly-cis-isoprene.
Hence, isoprene is the correct answer.
The hard, plastic covers of telephones are made of polymers of:
Report Question
0%
styrene
0%
acrylonitrile
0%
phenol-formaldehyde
0%
fluoromethane
Explanation
Bakelite is used for making of hard, plastic covers of telephones as it is non-breakable. Bakelite is a thermosetting polymer which once hardened cannot be melted back.
Bakelite is obtained by the polymerisation of phenol and formaldehyde.
Vinylite resins are copolymers of vinyl acetate and vinyl chloride. They are resistant to wear and tear to chemicals. One of their well-known uses is in:
Report Question
0%
floor coverings
0%
ropes
0%
tyres
0%
electrical insulators
Explanation
Vinylite resins are well known used in Floor coverings so that to resist chemicals from it.
The contraction of the rubber-band is a spontaneous, natural process because it is accompanied by:
Report Question
0%
an increase in the kinetic energy
0%
a decrease in the free-energy in the rubber-band
0%
an increase in heat in the rubber-band
0%
an elastic force
Explanation
Any process with
Δ
G
=
−
V
e
will be spontaneous as contraction of rubber band is spontaneous so there will be decrease in the free energy in rubber band.
'Accelerators', in rubber technology, are organic sulphur compounds used as:
Report Question
0%
catalysts for vulcanization
0%
carbon black binders for tyres
0%
fillers
0%
speed increasers for nylon tyres
Explanation
Accelerators speed up the reaction of sulphur with polymer to improve the economics of manufacture and prevent degradation which would otherwise occur on prolonged heating.
SBR(GRS, Buna-S, Cold Rubber) is obtained by free radical copolymerisation of:
Report Question
0%
Buta-1,3-dinene
(
70
%
)
and
30
%
phenyl ethene(styrene)
0%
Chloroprene and styrene
0%
Vinyl acetylene and styrene
0%
Isoprene and 1,3- butadiene
Explanation
Styrene rubber or SBR (Styrene-butadiene rubber) or GRS(Government controlled styrene rubber) is prepared by the copolymerization of buta-1,3- diene(70%) and styrene (30%). The name Buna-S is made up of Bu which indicates Buta-1,3-diene, NA is for sodium(Na) and S indicates Styrene.
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