Polymers Test

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Polymers Test - 67

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Weekly Quiz Competition

Question 1
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Which of the following structures represents neoprene polymer?

A

B

C

D

Solution

Neoprene is a family of synthetic rubbers that are produced by polymerization of chloroprene. Neoprene exhibits good chemical stability and maintains flexibility over a wide temperature range.
Question 2
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Which of the following is a natural polymer?

A
Polyester

B
Glyptal

C
Starch

D
Nylon-6

Solution

Natural Polymers are those substances which are obtained naturally.

Polyester is a synthetic fiber derived from coal, air, water, and petroleum.

Glyptal is formed by ethylene glycol and phthalic acid formed by step-growth polymerization.

Starch or amylum is a polymeric carbohydrate consisting of numerous glucose units joined by glycosidic bonds. This polysaccharide is produced by most green plants as energy storage and hence, naturally occurring polymer.

Nylon-6 is made from one kind of monomer called caprolactam.

Hence, option $$C$$ is correct.
Question 3
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Natural rubber is a polymer of:

A
neoprene

B
isoprene

C
chloroprene

D
butadiene

Solution

Natural rubber is a polymer of Isoprene.
Hence, Option "B" is the correct answer.
Question 4
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Which of the following is not a polymer?

A
Wool

B
Cotton

C
Leather

D
Fat

Solution

Wool consists of protein together with a small percentage of lipids.Proteins are polymers made out of amino acids. Hence, wool is a polymer.

Cotton is composed of pure cellulose, a naturally occurring polymer. Cellulose is a carbohydrate, and the molecule is a long chain of glucose (sugar) molecules.

Leather is made from animal skin, rawhide and animal skin is made of a polymer called collagen.

Fat molecules are made up of four parts, a molecule of glycerol and three molecules of fatty acids. Most fats are glycerides, particularly triglycerides (triesters of glycerol). Hence, not a polymer.

Hence, option $$D$$ is the answer.
Question 5
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Which of the following is an example of condensation polymer?

A
Nylon

B
Bakelite

C
Urea-formaldehyde resin

D
All of these

Solution

Condensation polymers are any kind of polymers formed through a condensation reaction, where molecules join together and losing small molecules as by-products such as water or methanol.

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. The two monomers form an alternating chain, with water released as a side product of the reaction.

Bakelite is formed from a condensation reaction of phenol with formaldehyde
with the removal of water.
Urea-formaldehyde resin is a very important type of amino plastic resin, which is formed by the reaction between two monomers, urea, and formaldehyde with the removal of water molecule.

Hence, option $$D$$ is correct.
Question 6
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Terylene is a condensation polymer of ethylene glycol and:

A
phthalic acid

B
terephthalic acid

C
benzoic acid

D
salicylic acid

Solution

Terylene is a condensation polymer of ethylene glycol and terephthalic acid,
it is the product of condensation polymerisation, this type of polymerisation generally involves a repetitive condensation reaction between two bi-functional monomers and lead to the formation of high molecular mass condensation polymers.
The correct option is B.
Question 7
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Which of the following is an example of condensation polymer?

A
Buna-S rubber

B
Bakelite

C
Nylon-6,6

D
All of these

Solution

Condensation polymerisation involves a reaction between monomers with two different functional groups. When these types of monomers react they join together, usually losing a small molecule such as water, and so the reactions are called condensation reactions.
Most natural polymers are condensation polymers, and many synthetic polymers are made by condensation polymerisation as substitutes to natural fibres. Therefore Options A, B and C are all examples of condensation Polymerization.
Question 8
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Which of the following is not a polymer?

A
Gun cotton

B
Perspex

C
Shellac ( eg . lac shellac)

D
Wax ( eg . bees wax)

Solution

The very first synthetic polymer came about when a scientist reacted cellulose, in the form of cotton, with nitric acid. The result was cellulose nitrate (gun cotton).

Perspex is the name given to polymethyl-2-methylpropanoate, the polymer of methyl methacrylate which is thermoplastic, and transparent.

Shellac is a natural bioadhesive polymer and is chemically similar to synthetic polymers, and thus can be considered a natural form of plastic.

Waxes are a diverse class of organic compounds that are lipophilic, malleable solids near ambient temperatures. So, it is not a polymer.

Hence, option $$D$$ is correct.
Question 9
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Which of the following is a step-growth polymer?

A
Polyisoprene

B
Polythene

C
Nylon

D
Polyacrylonitrile

Solution

Condensation polymerization is a form of step-growth polymerization where small molecules react with each other to form larger structural units while releasing smaller molecules as a byproduct, such as water or methanol.

Polyacrylonitrile(PAN) is synthesized by addition polymerization of acrylonitrile(AN).

Nylon is a type of condensation polymer called a polyamide. Polyamides are created by reacting a dicarboxylic acid with a diamine with water released as a side product of the reaction.

The addition polymerization of ethylene forms polyethylene.

Polyisoprene is a collective name for polymers that are produced by polymerization of isoprene.

Hence, option $$C$$ is correct.
Question 10
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Which of the following is a biodegradable polymer?

A
Cellulose

B
Polythene

C
Polyvinyl chloride

D
Nylon-6

Solution

Biodegradable polymers are a special class of polymer that breaks down after its intended purpose by bacterial decomposition process to result in natural byproducts such as gases $$(CO_2, N_2)$$, water, biomass, and inorganic salts.
Cellulose is a natural polymer and has no taste, is odorless, is hydrophilic and insoluble in water and most organic solvents, and is biodegradable.
Polythene is nonbiodegradable.
PVC is not biodegradable or degradable. Items made from PVC will retain their form for decades.
Nylon-6 is not biodegradable as it has amide bonds which are more stable.

Hence, option $$A$$ is correct.