Macromolecules composed of many repeated sub units

Monomers bonded together in a long chain

a condensation polymer with a benzene ring in every repeating unit.

an addition polymer with a benzene ring in every repeating unit.

an addition polymer with two carbon atoms in every repeating unit.

a condensation polymer with two nitrogen atmos in every repeating unit.

MCQ Questions for Class 12 Engineering Chemistry Polymers Quiz 1

Teflon is an example of polymer which is a/an

0%
polyamide
0%
addition Ploymer
0%
polyster
0%
formaldehyderesin

Explanation

TEFLON - It is an addition polymer prepared by heating tetrafluoroetane with a free radical.

$n CF_{2} = CF_{2} \xrightarrow[High pressure]{Catalyst} -[CF_{2}-CF_{2}-]_{n}$
Tetrafluoroetane Teflon
POLYAMIDE - These are polymers possessing amide linkage and Teflon doesn't contain any amide linkage.
POLYSTER - These are polycondensation products of dicarboxylic acids and diols.
FORMALDEHYDE RESIN - It can refer to many formaldehyde polymers such as melamine formaldehyde, urea formaldehyde, phenol formaldehyde.

Polyester is made up of the repeating units of a chemical called:

0%
ester
0%
ether
0%
cotton
0%
ethene

Plexiglass is a polymer of ____.

0%
acrylic acid
0%
methylacrylate
0%
methyl methacrylate
0%
methyl propacrylate

Explanation

Plexiglass is a very important commercial polymer because of its high resisting properties. It is a polymer of methyl methacrylate.
The structure of the

$methyl methacrylate$ is given above.

$C{F}_{2} = C{F}_{2}$ is a monomer of:

0%
Teflon
0%
Orlon
0%
Polythene
0%
Nylon-6

Explanation

Tetrafluorothylene

$C{F}_{2} = C{F}_{2}$ is a monomer of Teflon

${ \left( -C{ F }_{ 2 }-C{ F }_{ 2 }- \right) }_{ n }$ .

$n C{ F }_{ 2 } = C{ F }_{ 2 } \rightarrow { \left( -C{ F }_{ 2 }-C{ F }_{ 2 }- \right) }_{ n }$

The following are synthetic polymers except :

0%
Teflon
0%
Terylene
0%
Nylon
0%
Proteins

Most balloons, tyres and footballs are made-of rubber. This is because rubber is:

0%
naturally available
0%
cheap
0%
an electrical insulator
0%
soft and flexible

Ropes of nylon and polyester are commonly used in cranes and elevators.

0%
True
0%
False

Synthetic fibres are synthesized from raw material called:

0%
polyester
0%
polymers
0%
polythene
0%
polycot

As plastics and synthetic fibers consist of repeating monomer units, they are known as ______ .

0%
polyesters
0%
polymers
0%
co-polymers
0%
None of the above

Which is used in making of thermocol ?

0%
Polypropylene
0%
Polyethylene
0%
Polystyrene
0%
High density polyethylene

Which of the following is not a polymer?

0%
Ice
0%
Starch
0%
Protein
0%
Cellulose

Vulcanization of rubber helps to make rubber hard and resistant to hot and cold conditions.

0%
True
0%
False

Polyacrylamide gel is prepared by mixing acrylamide and ______________ at fixed proportions.

0%
glycol
0%
bisacrylamide
0%
hydrazine
0%
none of the above

Explanation

$\text{Polyacrylamide gel= Acerylamide+Bisacrylamide.}$

Bakelite is a product of the reaction between:

0%
Formaldehyde and $NaOH$
0%
Aniline and Urea
0%
Phenol and Methanal
0%
Phenol and Chloroform

Which of the following is a way to dispose non-biodegradable materials?

0%
Recycling
0%
Land fill
0%
Incineration
0%
All of above

Which of the following is correct about cellulose?

0%
Natural polymer
0%
Synthetic polymer
0%
Semi synthetic polymer
0%
Natural monomer

Bakelite is formed by:

0%
polymerization of phenol and formaldehyde
0%
polymerization of alcohol and acetaldehyde
0%
condensation of phenol and formaldehyde
0%
condensation of phenol and acetaldehyde

What are polymers?

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Macromolecules composed of many repeated sub units
0%
Monomers bonded together in a long chain
0%
Both A and B
0%
None of the above

Which among the following is a polymer of cellulose?

0%
Nylon
0%
Polyester
0%
Cotton
0%
Polythene

Which compound is condensation polymer?

0%
Nylon
0%
PVC
0%
Natural
0%
Teflon

What are blended fibres?

0%
Mixture of two natural fibres
0%
Mixture of two synthetic fibre
0%
Mixture of natural and synthetic fibres
0%
All of above

Which of the following kind of polymers are known for their high crystallinity?

0%
syndiotactic
0%
atactic
0%
isotactic
0%
none of the mentioned

A polymer is formed by :

0%
Hydration
0%
Methylation
0%
Hydrolysis
0%
Dehydration synthesis

Emulsions of polyvinyl acetate are used in ?

0%
Polishes
0%
Firecrackers
0%
Crayons
0%
Latex paints

The monomer of the polystyrene polymer is:

0%
${CH}_{3}CH=CH{CH}_{3}$
0%
${CH}_{3}CH={CH}_{2}$
0%
${({CH}_{3})}_{2}=C{({CH}_{3})}_{2}$
0%
None of the above

Which of the following monomers are unsuitable for condensation polymerization?

0%
hydroxy acids
0%
butane-dioic acid and glycol
0%
diamines and dicarboxylic acids
0%
propanoic acid and ethanol

Explanation

Propanoic acid and ethanol, both are monofunctional monomers

$CH_3-CH_2- OH , CH_3-CH_2COOH$ which are not suitable for a polycondensation reaction to take place because once they combine by condensation polemerisation further polymerisation is not possible.

Which of the following polymers of glucose is stored by animals?

0%
Cellulose
0%
Amylose
0%
Amylopectin
0%
Glycogen

Of the following which one is classified as polyester polymer?

0%
Terylene
0%
Backelite
0%
Melamine
0%
Nylon-66

Explanation

Polyester polymers are a type of polymers in which monomer units are attached to each other by the ester linkage. Polyester is also known as Terylene which is made by (ethyleneterapthalate) benzene 1,4-dicarboxylic acid and ethene 1.4 diol, by condensation polymerisation as :

$C_6H_4(COOH)_2 + HO-CH_2-CH_2-OH\rightarrow -(OC-ph-O CH_2-CH_2 -O)-_n$

What is the monomer unit of natural rubber?

0%
Isoprene
0%
Ethene
0%
Neoprene
0%
Tetrafluro ethene

Plastics are:

0%
salts
0%
acids
0%
polymers
0%
solvents

Which among the following is a chain growth polymer?

0%
Nylon
0%
Bakelite
0%
Terylene
0%
Teflon

Explanation

Teflon is a chain-growth polymer manufactured by heating tetrafluoromethane with a free radical or persulphate catalyst at high pressures.

$n CF_{2} = CF_{2} \xrightarrow [High\ pressure]{catalyst} -[CF_{2}-CF_{2}-] _{n}$

Tetrafluoroethane Teflon

Whereas, nylon, bakelite and terylene are condensation polymers.

Which of the following contains isoprene units?

0%
Natural rubber
0%
Nylon - $6,\:6$
0%
Polyethylene
0%
Dacron

Trans-form of rubber is called ___.

0%
Isoprene
0%
Neoprene
0%
Gutta percha
0%
Glyptal

The monomer of natural rubber is:

0%
butadiene
0%
chloroprene
0%
isoprene
0%
styrene

Explanation

Hint: A monomer is a type of molecule that may chemically bind to other molecules to build a polymer.

Correct option:

$C$

The explanation for the correct option:

Preparation of natural rubber:

A linear polymer of isoprene is natural rubber. That is natural rubber is a polymer of isoprene. Natural rubber is an example of an addition polymer as it is formed by repeating a monomer without the elimination of any molecule.

An addition polymerization joins thousands of isoprene units together to form poly(isoprene) which is known as natural rubber.

Dicarboxylic acids react with diols to form which type of co-polymer?

0%
Random
0%
Alternating
0%
Block
0%
Graft

Polymerisation in which two or more chemically different monomers take part is called:

0%
addition polymerisation
0%
copolymerisation
0%
chain polymerisation
0%
homopolymerisation

Which of the following is an example of condensation polymers?

0%
Polythene
0%
Orlon
0%
Terylene
0%
None of these

Terylene is:

0%
an addition polymer with a benzene ring in every repeating unit.
0%
a condensation polymer with a benzene ring in every repeating unit.
0%
an addition polymer with two carbon atoms in every repeating unit.
0%
a condensation polymer with two nitrogen atmos in every repeating unit.

Which of the following is an elastomer?

0%
Vulcanized rubber
0%
Dacron
0%
Polystyrene
0%
Melamine

Dacron is an example of a/an:

0%
elastomer
0%
fibre
0%
thermoplastic
0%
thermosetting polymer

Explanation

Fibres are thread forming solids which possess high tensile strength.

$\text{Dacron}$ is formed by the interaction of ethylene glycol and terephthalic acid.

The formula for calculating

$\bar{M_{w}}$ of a polymer is:

0%
$\frac{\sum NiMi}{\sum Ni}$
0%
$\frac{\sum NiMi}{\sum Mi}$
0%
$\frac{\sum NiMi^{2}}{\sum Mi}$
0%
$\frac{\sum NiMi^{2}}{\sum NiMi}$

Explanation

$\bar{M_{W}}$ is the mass average molecular mass of a polymer, which is calculated as the ratio of total mass of groups of molecules having different molecular masses multiplied with their respective molecular mass to the the total mass of all the molecules.
Therefore,

$\bar{M_{W}}=$

$\frac{\sum NiMi^{2}}{\sum NiMi}$ .

The empirical formula of natural rubber is:

0%
$(C_{3}H_{5})_{n}$
0%
$(C_{5}H_{8})_{n}$
0%
$(C_{5}H_{3})_{n}$
0%
$(C_{8}H_{5})_{n}$

Explanation

Natural rubber is formed from the polymerization of monomer, isoprene. The structure of isoprene is as follows :

$CH_{3}$
$\mid$
$H_{2}C=C-CH=CH_{2}$

The repeating unit of rubber as shown in the figure contains $5$ atoms of carbon and $8$ atoms of hydrogen. Hence, its empirical formula becomes $(C_{5}H_{8})_n$ .

For natural polymers, PDI is generally ___

0%
$0$
0%
$1$
0%
$100$
0%
$1000$

Explanation

For natural polymers, PDI (Polydispersity Index) is generally equal to

$1$ , which means that they are monodisperse. Such polymers are more homogeneous.

The tensile strength, elasticity and resistance to abrasion can be increased by a process called:

0%
Galvanisation
0%
Vulcanization
0%
Bessemerisation
0%
Sulphonation

The formula for calculating

$\bar{M_{n}}$ of a polymer is:

0%
$\frac{\sum NiMi}{\sum Ni}$
0%
$\frac{\sum NiMi}{\sum Mi}$
0%
$\frac{\sum NiMi^{2}}{\sum Mi}$
0%
$\frac{\sum NiMi^{2}}{\sum NiMi}$

Explanation

$\bar{M_{n}}$ is the number average molecular mass of a polymer which is calculated as the ratio of the total mass of all the molecules of a sample polymer divided by the total number of molecules.

Hence,

$\bar{M_{n}}=\cfrac{\sum NiMi}{\sum Ni}$ .

The process involving heating of rubber with sulphur is called ___

0%
Galvanisation
0%
Vulcanization
0%
Bessemerisation
0%
Sulphonation

Explanation

Vulcanisation of Rubber - Natural rubber becomes soft at high temperature (>

$335$ K) and brittle at low temperature (<

$283$ K) and shows high water absorption capacity.
The process of vulcanisation includes heating of raw rubber with sulphur and an appropriate additive at temperature range between

$373$ K to

$415$ K. Sulphur foms crosslinks at reactive sites of double bonds and thus, rubber gets stiffened.

The synthetic polymer which resembles natural rubber is:

0%
Neoprene
0%
Buna-S
0%
Nylon
0%
Rayon

Explanation

Neoprene resembles natural rubber.

Natural rubber is a linear polymer of

$2$ -methyl-

$1,\:3$ -butadiene called as isoprene and Neoprene is a linear polymer of

$2$ -chloro-

$1,\:3$ -butadiene called as chloroprene.

Option A is correct.

The number average molecular mass and mass average molecular mass of a polymer are

$30,000$ and

$40,000$ respectively. The PDI of the polymer is

0%
$< 1$
0%
$>1$
0%
$1$
0%
$0$

Explanation

PDI (Polydispersity Index) is the ratio of the mass average molecular mass to the number average molecular mass.

Therefore,

$\text{PDI} = \dfrac{40000}{30000} = 1.33$ .

Thus, PDI of the polymer is

$>1$ .

$Caprolactum\: \xrightarrow {hydrolysis} A$

$A + Glycine \rightarrow B (Polymer)$

Here,

$B$ is :
I. Condensation Polymer
II. Addition Polymer
III. Polyamide Polymer
IV. Polyester Polymer
V. Biodegradable Polymer

0%
I, III, V are corect.
0%
II, IV are correct.
0%
II, III, IV are correct.
0%
II, IV, V are correct.

A. Natural rubber is an elastomer.
R. The inter-molecular forces of attraction between the polymer chains are weak vander Waals forces.

0%
Both A and R are correct and R is the correct explanation of the A
0%
Both A and R are correct but R is not the correct explanation of the A
0%
A is correct but R is in correct
0%
A is incorrect but R is correct

CBSE Questions for Class 12 Engineering Chemistry Polymers Quiz 1 - MCQExams.com

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Practice Class 12 Engineering Chemistry Quiz Questions and Answers

CBSE Questions for Class 12 Engineering Chemistry Polymers Quiz 1 - MCQExams.com

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Practice Class 12 Engineering Chemistry Quiz Questions and Answers

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