Tag: polymers

Questions Related to polymers

Hair sprays generally contain resins in a volatile solvent. Upon drying, they leave a thin film that holds the hair in place. Which of the following is a resin used in hair spray?

types of polymerisation reactions condensation polymerisation polymer polymers chemistry

  1. Polyester

  2. Polyvinyl alcohol

  3. Polyvinyl pyrrolidone (PVP)

  4. Polythene

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Correct Option: C
Explanation:
$PVP$ (Polyvinyl pyrrolidone) is a versatile ingredient which is used in cosmetics and beauty industry as a bindes, film former, emulsion stabilizer, suspending agent and hair fixative used in products like mascara, eyeliner, hair conditioners, hair sprays and shampoos.

Which of the following polymers can be made by condensation polymerisation reaction?

types of polymerisation reactions condensation polymerisation polymer polymers chemistry

  1. Dacron

  2. Nylon - $6,: 6$

  3. Bakelite

  4. Polyethylene

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Correct Option: A,B,C
Explanation:

Condensation polymers are formed by repeated condensation reactions between two different bi-functional or tri-functional monomeric units. In these polymerisation reactions, the elimination of small molecules such as water, alcohol, hydrogen chloride, etc. takes place. 

Dacron, Nylon-6.6 and Bakelite are produced by condensation polymerisation.

On the other hand, Polyethylene is formed by breakage of the double bond and there is no elimination of molecules.


Which of the following is/are not a condensation copolymer?

types of polymerisation reactions condensation polymerisation polymer polymers chemistry

  1. Nylon-$6$

  2. Nylon-$6,6$

  3. Dacron

  4. PVC

Show answer
Correct Option: A,D
Explanation:
The condensation polymers are formed by repeated condensation reaction between two different bi-functional or tri-functional monomeric units. 

In these polymerisation reactions, the elimination of small molecules such as water, alcohol, hydrogen chloride, etc. take place. The examples are terylene (dacron), nylon 6, 6, etc. For example, nylon 6, 6 is formed by the condensation of hexamethylenediamine with adipic acid.

When two different types of monomers are joined in the same polymer chain, the polymer is called a copolymer. 
Nylon 6 is a condensation polymer but it's not a co-polymer.
PVC is an addition polymer.

Hence, options A and D are correct.

Nylon-$6$ is prepared by linear condensation homopolymerization reaction of: 

types of polymerisation reactions condensation polymerisation polymer polymers chemistry

  1. caprolactum

  2. hexamethylene diamine and adipic acid

  3. $6$-aminohexanoic acid

  4. acrylonitrile

Show answer
Correct Option: A
Explanation:

Solution:- (A) Caprolactam

Nylon-$6$ is prepared by linear condensation homopolymerization reaction of caprolactam.
$n \left( \text{Caprolactum} \right) \xrightarrow[{N} _{2}]{533 \; K} \text{Nylon}-6$

Which of the following polymers does not soften on heating?

classification of polymers introduction to polymers and its classification polymer polymers chemistry

  1. Bakelite

  2. Polythene

  3. Polystyrene

  4. PVC

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Correct Option: A
Explanation:

Bakelite is a thermosetting polymer having high crosslinkings and hence once hardened cannot be softened.

The weakest interparticle forces are present in:

classification of polymers introduction to polymers and its classification polymer polymers chemistry

  1. Thermosetting polymers

  2. Thermoplastic polymers

  3. Fibers

  4. Elastomers

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Correct Option: D
Explanation:

 Elastomers: The polymer chains are held together by the weakest intermolecular forces. These weak binding forces permit the polymer to be stretched.


Fibres: Fibers have strong intermolecular forces like hydrogen bonding. These strong forces also lead to close packing of chains and thus impact crystalline nature.

Thermoplastic polymers: They possess intermolecular forces of attraction intermediate between elastomers and fibers.

Thermosetting polymers: They are cross-linked & heavily launched.

Hence, option D is correct.

Artificial silk is a ___

classification of polymers introduction to polymers and its classification polymer polymers chemistry

  1. polypeptide

  2. polysaccharide

  3. polythene

  4. polyvinyl chloride

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Correct Option: B
Explanation:

Artificial silk is a synthetic manufactured from cellulose fibre. Cellulose is a common example of polysaccharides. Thus, artificial silk is a polysaccharide.

The products of addition polymerisation reaction is:

classification of polymers introduction to polymers and its classification polymer polymers chemistry

  1. PVC

  2. nylon

  3. terylene

  4. polyamide

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Correct Option: A

Rayon is chemically known as:

classification of polymers introduction to polymers and its classification polymer polymers chemistry

  1. cellulose nitrate

  2. cellulose

  3. cellulose acetate

  4. resins

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Correct Option: C
Explanation:

Rayon is chemically known as cellulose acetate, which is a semi-synthetic kind of polymer.

It is considered as semi-synthetic because it has natural component cellulose which combined with acetate gives cellulose acetate (rayon)

Option C is correct.

Glyptal or alkyd is polymer of :

classification of polymers introduction to polymers and its classification polymer polymers chemistry

  1. Ethylene glycol and phthalic acid

  2. Ethylene and phthalic acid

  3. Phthalic acid and acetylene

  4. None of the acid

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Correct Option: A