Tag: chemistry

Questions Related to chemistry

Acrylonitrile forms_____________.

chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

  1. Terylene

  2. Orlon

  3. PVC

  4. Bakelite

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Correct Option: B

Fomaldehyde is the starting material for the manufacture of :

chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

  1. backelite

  2. caprolactam

  3. D.D.T

  4. rayon

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Correct Option: A

Monomer used to prepare orlon is_________.

chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

  1. $\displaystyle H _{2}C= CH-Cl$

  2. $\displaystyle F _{2}C= CF _{2}$

  3. $\displaystyle H _{2}C= CHCN$

  4. $H _2C=C(Cl)-CH=CH _2$

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Correct Option: C
Explanation:
Orlon is polyacrylonitrile. The monomer acrylonitrile is $CH _2=CHCN$.
Hence, option C is correct.

Which polymer among the following polymers does NOT soften on heating?

chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

  1. Bakelite

  2. Polythene

  3. Polystyrene

  4. PVC

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Correct Option: A
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 are addition polymers?

chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

  1. Nylon

  2. Melamine formaldehyde resin

  3. Orlon

  4. All of the above

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Correct Option: C
Explanation:

Orlon is an addition polymers as its molecular mass is integral multiple of molecular mass of its monomer.

Which of the following is a monomer of teflon?

chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

  1. Difluoroethane

  2. Trifluoroethane

  3. Tetrafluoroethane

  4. None of these

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Correct Option: C
Explanation:

Teflon is an addition polymer of tetrafluoroethylene.

$\underset {\text{tetrafluoroethylene}}{ n{ F } _{ 2 }C=C{ F } _{ 2 } } \xrightarrow [ \text{Pressure}]{ \text{Heat}} \underset { \text{teflon} }{ -{ ({ F } _{ 2 }C-C{ F } _{ 2 })- } _{ n } } $
It is used to make non-sticky utensils.

Which of the following polymer form net like structure ?

chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

  1. Butyl rubber

  2. Polythene

  3. Polystyrene

  4. Melamine

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Correct Option: D
Explanation:

Thermosetting polymers have a net-like structure because of the presence of cross-links between different polymeric chains. Among the given only melanin polymer is a thermosetting polymer, so it has a net-like structure. 


Note: Butyl rubber is a Westerner whereas polythene and polystyrene we thermoplastics.

Which of the following is/are true statement(s) for the preparation of Teflon?

chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

  1. It is produced by condensation polymerization

  2. Water acts as catalyst

  3. The monomer used is tetrafluoroethane

  4. The monomer is obtained from carbon tetrachloride

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Correct Option: B
Explanation:

 It is produced by addition polymerization. Water acts as a catalyst. The monomer used is tetrafluoroethylene. It is obtained from chloroform.


The option (B) represents a true statement for the preparation of Teflon.

Which names are associated with PMMA?

chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

  1. Melmac

  2. Acrilan

  3. Saran

  4. Acrylite

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Correct Option: D
Explanation:

The name acrylite is associated with PMMA.
PMMA is polymethyl methaacrylate. It is an addition homopolymer of methyl methacrylate ($\displaystyle CH _2 =C(CH _3)COOCH _3 $). It is known as plexiglass.

Nylon threads are made of ________.

chemistry polymer polymers of commercial importance some commercially important polymers condensation polymers

  1. polyethylene polyemer

  2. polyvinyl polymer

  3. polyester polymer

  4. polyamide polymer

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Correct Option: D
Explanation:

Nylon threads are polymer of polyamides obtained by condensing amides and /or carboxylic acids 
Examples are nylon - $6$, nylon - $6,: 6$.