MCQ Questions for Class 12 Engineering Chemistry Polymers Quiz 13

The most suitable property for molecular weight determination of polymers is:

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osmotic pressure
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lowering of vapour pressure
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elevation in boiling point
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depression in freezing point

Buna-N synthetic rubber is a copolymer of

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0%
${ H }_{ 2 }C=CH-CH={ CH }_{ 2 }$ and $NC-CH={ CH }_{ 2 }$
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${ H }_{ 2 }C=CH-CN$ and ${ H }_{ 5 }{ C }_{6}-CH-CH={ CH }_{ 2 }$
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Buna-N and Buna-S are the types of

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Natural rubber
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Synthetic rubber
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Buna-N is natural rubber while Buna-S is synthetic rubber
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None of these

This step basically illustrates the:

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chain initiation
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chain propagation
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chain termination
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All of these

Match the following
polymer Catalyst
A) Low density polythene 1)

${\text{FeS}}{{\text{O}}_{\text{4}}}{\text{ + }}{{\text{H}}_{\text{2}}}{{\text{O}}_{\text{2}}}$
B) Polypropylene 2)

${\left( {{\text{N}}{{\text{H}}_{\text{4}}}} \right)_{\text{2}}}{{\text{S}}_{\text{2}}}{{\text{O}}_{\text{8}}}$
C) Teflon 3)

${\left( {{{\text{C}}_{\text{2}}}{{\text{H}}_{\text{5}}}} \right)_{\text{3}}}{\text{Al}}$
D) Orlon 4)Trace of oxygen

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A-4 , B-3, C-2, D-1
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A-4, B-3, C-1, D-2
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A-3, B-4, C-2, D-1
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A-3, B-4, C-1, D-2

Chemical reactions could have converted simple organic compounds into _________ for origin of life:

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Macromolecules
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Cells
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Nitrogen
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Micromolecules

Explanation

$\textbf{Correct Option A}$

$\textbf{Solution}$

$\bullet$ The origin of the life happened due to the synthesis of organic biomolecules from the inorganic compounds by the process of chemosynthesis.

$\bullet$ During the oldest organic reactions, there is no availability of biological catalyst. So, the biomolecules are evolved from the in organic molecules through the process of Chemical synthesis.

$\bullet$ So, chemical reactions could have converted simple organic compounds into macromolecules for origin of life.

$\bullet$ Macromolecules are very large molecules composed of many atoms that are bonded with covalent bonds.

$\bullet$ So, the correct option is A.

Which of the following polymers consists of practically linear molecules?

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Low density polythene
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High density polythene
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Both (A) and (B)
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Neither (A) nor (B)

Among the following, the branched chain polymer is:

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Polyvinyl chloride
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Bakelite
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Low density polythene
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High density polythene

Which is the correct structure of Nylon-6?

Explanation

Nylon-6 will be derived from the

$\epsilon$ -caprolactum which contain 6 carbon atoms.
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Orlon is a polymer of

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Tertafluoro ethylene
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Acrylonitrile
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Ethanoic acid
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Benzene

Which of the following polymer is used in paints?

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Gutta percha
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Melamine
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Buna-S
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Novolac

Explanation

Gutta-percha is trans-1,4-polyisoprene. It is generally used in root canal obturating material.

Buna-S is a polymer of 1,3-butadiene and styrene and it is used to make gaskets, tires, etc.

Melamine is a polymer of melamine and formaldehyde and is used to make plastic materials.

Novolac is a condensation polymer of formaldehyde and phenol and it is used in paints.

Hence, option

$D$ is correct.

Polymers 'X' and 'Y' respectively are:

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nylon-6; nylon-6, 6
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nylon-6,6; nylon-6
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nylon-6; nylon-6, 10
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nylon-6,6; nylon-6, 10

Explanation

Nylon-x,y is a nylon polymer formed by the reaction of a diammine of x carbons and a dibasic carboxylic acid of y carbons.

Therefore, the product formed on the reaction of

$\mathrm{NH_2-(CH_2)_6-NH_2}$ and adipic acid

$\mathrm{COOH-(CH_2)_4-COOH}$ is Nylon-6,6

and, the product formed on the reaction of

$\mathrm{NH_2-(CH_2)_6-NH_2}$ and sebaic acid

$\mathrm{COOH-(CH_2)_8-COOH}$ is Nylon-6,10

Hence, Option "D" is the correct answer.

In bakelite, the rings are joined to each other through:

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$-CH_2-$
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$-O-$
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0%

A plastic bakelite is a compound of phenol with:

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$CH_3CHO$
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$HCHO$
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acetal
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chlorobenzene

Acetoacetic ester is made by the process of:

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esterification
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condensation
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polymerisation
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isomerisation

A plastic bakelite is obtained from:

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benzene
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formaldehyde
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ammonia
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phenol

Bakelite is prepared by the reaction between:

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phenol and formaldehyde
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urea and formaldehyde
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ethylene and glycol
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tetramethylene and glycol

Which of the following structures represents neoprene polymer?

Which of the following statements is not correct?

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Caprolactam is the monomer of nylon-6
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Terylene is a polyester polymer
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Phenol formaldehyde resin is known as bakelite
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The monomer of natural rubber is butadiene

The monomer of polystyrene is:

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$C_2H_5CH=CH_2$
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$CH_2=CHCl$
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$C_6H_5CH=CH_2$
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$CH_2=CHCHO$
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$C_6H_5CH=CHCHO$

Explanation

The monomer of polystyrene is Styrene i.e.

$\mathrm{C_6H_5CH=CH_2}$

Hence, Option "C" is the correct answer.

Which of the following is not an example of additional polymer?

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Terylene
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Polypropylene
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Polyethylene
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Polystyrene

Explanation

An addition polymer is a polymer that forms by simple linking of monomers without the co-generation of other products. Addition polymerization sometimes called chain-growth polymerization.

Ethylene glycol and terephthalic acid are monomers that on polymerization give terylene with water as a byproduct. Hence, not an addition polymer.

Polypropylene is produced via chain-growth polymerization from the monomer propylene.

Polyethylene is the addition product of ethylene.

Polystyrene is a synthetic aromatic hydrocarbon polymer made from the monomer known as styrene.

Hence, option

$A$ is the answer.

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Nylon is not a:

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Condensation polymer
0%
Polyamide
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Copolymer
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Homopolymer

Explanation

Nylon is a type of condensation polymer called a polyamide. Polyamides are created by reacting to a type of monomer called a dicarboxylic acid together with another monomer called a diamine. Hence,

$A$ and

$B$ are true.

A copolymer is a polymer derived from more than one species of monomer.

Hence, Nylon is a copolymer.

A homopolymer is a polymer where every monomer unit (mer) of the chain is the same.

Hence, the answer is option

$D$ .

Which is a naturally occuring polymer?

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Polythene
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PVC
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Acetic acid
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Protein

Explanation

Polyethylene or polythene is the most common plastic which is an addition product of ethylene. So, not a natural polymer.

Polyvinyl chloride (PVC) is the synthetic plastic polymer, formed by addition of vinyl chloride molecules.

Acetic acid is a liquid organic compound with the chemical formula

$CH_3COOH$ which is not a polymer.

Proteins are polymers made out of amino acids. They are made by animals, plants, bugs, fungi, and other living things. A protein is actually a polyamide. Hence, they are naturally occurring polymer.

Hence, option

$D$ is correct.

Bakelite is a polymer of

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$HCHO$ + phenol
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$HCHO$ + aldehyde (acetaldehyde)
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Phenol + $H_2SO_4$
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$HCHO$ + acetone

Explanation

Bakelite is obtained from

$\text{phenol by reacting with formaldehyde HCHO.}$ It is step growth branched thermosetting co-polymer of phenol and formaldehyde.

The mass average molecular mass & number average molecular mass of a polymer are respectively 40,000 and 30,The polydispersity index of polymer will be:

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

Explanation

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

Therefore,

$PDI= \dfrac{40000}{30000}=1.33\ \ >\ 1$

Hence, option

$B$ is correct.

Polymers of the type

$Z – M_n – Y$ , i.e. those which contain a foreign molecule in addition to the recurring unit are known as:

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Semisynthetic polymers
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Atactic polymers
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Telomers
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Plasticiser

Explanation

Polymers of the type

$Z-M_n-Y$ , those which contain a foreign molecule in addition to the recurring unit are known as telomers and the process of their formation is called telomerisation.

Hence, option

$C$ is correct.

The product of addition polymerisation reaction is:

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PVC
0%
Nylon
0%
Terylene
0%
Polyamide

Explanation

In addition polymerization (sometimes called chain-growth polymerization), a chain reaction adds new monomer units to the growing polymer molecule one at a time through double or triple bonds in the monomer.

Polyvinyl chloride is produced by polymerization of the vinyl chloride monomer without forming any by-product.

The monomers for nylon 6-6 are adipic acid and hexamethylenediamine. The two molecules are combined to create the polymer and water (H2O) is produced as a by-product.

Terylene is a synthetic polyester fiber produced by polymerizing ethylene glycol and terephthalic acid which is obtained from petroleum.

A polyamide is a polymer with repeating units linked by amide bonds. Polyamides can be formed by the condensation of molecules that contain both a carboxyl and an amino

$(NH_2\ \ or \ \ NH)$ group.

Hence, option

$A$ is correct.

The process of vulcanisation makes rubber:

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Soluble in water
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Elastic
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Hard
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Soft

Explanation

Vulcanization is a chemical process in which the rubber is heated with sulphur at 373K to 415K. The process involves the formation of cross-links between long rubber molecules so as to achieve improved elasticity, resilience, tensile strength, viscosity, hardness and weather resistance.

Hence, option

$C$ is correct.

Which of the following is a chain growth polymer?

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Nylon-6
0%
Dacron
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Glyptal
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Polypropylene

Explanation

Chain growth polymer is also known as addition polymer. A chain-growth polymer is a polymer that is formed when molecules of the same monomer or different monomers add together on a large scale to form the polymer.

Among given polymers, polypropylene is a chain-growth polymer and the monomer is propene.

Nylon-6, Dacron, and Glyptal are formed from step-growth polymerization.

Hence, the answer is option

$D$ .

An example of chain growth polymer is.

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Nylon-66
0%
Bakelite
0%
Terylene
0%
Teflon

Explanation

Out of the given polymers, Teflon is a chain-growth polymer as the molecules of tetrafluoroethylene (monomer) simply add together to form the polymer.

Hence, option

$D$ is the answer.

Which of the following has cross-links?

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Vulcanised rubber
0%
Nylon
0%
Phenol-formaldehyde resins
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Both (a) and (c)

Explanation

Novolac (low molecular weight polymers derived from phenols and formaldehyde) on heating with formaldehyde undergoes crosslinking to form an infusible solid mass called bakelite (Phenol-formaldehyde resin).

On vulcanisation, sulphur forms cross-links at the reactive sites of double bonds and thus the rubber gets stiffened.

Hence, option

$D$ is correct.

Which of the following statement is correct regarding the drawbacks of raw rubber?

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It is plastic in nature
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It has little durability
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It has large water-absorption capacity
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All of these

Explanation

Drawbacks of raw rubber:

The raw rubber is plastic in nature.

It becomes soft at high temperature.

It has little durability and it has large water absorption capacity.

Hence, option

$D$ is correct.

Neoprene is a polymer of:

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Propene
0%
Vinyl chloride
0%
Chloroprene
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Butadiene

Explanation

Neoprene (also polychloroprene) is a family of synthetic rubbers that are produced by polymerization of chloroprene.

Hence, option

$C$ is correct.

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CBSE Questions for Class 12 Engineering Chemistry Polymers Quiz 13 - MCQExams.com

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Practice Class 12 Engineering Chemistry Quiz Questions and Answers

CBSE Questions for Class 12 Engineering Chemistry Polymers Quiz 13 - MCQExams.com

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Practice Class 12 Engineering Chemistry Quiz Questions and Answers

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