Tag: chemistry

Questions Related to chemistry

Natural fibre is :-

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

  1. Bakelite

  2. Cellulose

  3. Rubber

  4. Nylon-$6$

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Correct Option: B

Which of the following are made of polyamides ?

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

  1. Wool

  2. Natural silk

  3. Rayon

  4. Nylon

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Correct Option: A,B,D

Which one of these is a monomer of Bakelite?

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

  1. Vinyl acetate

  2. Tetrafluoroethylene

  3. Formaldehyde

  4. Propylene

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Correct Option: C
Explanation:

Bakelite is a condensation polymer of phenol and formaldehyde. Bakelite is widely used for making molded products.  It was the first plastic made from synthetic components.

Which of the following processes can be used to prepare polystyrene ?

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

  1. Anionic

  2. Cationic

  3. Free radicals

  4. Ziegler-Natta

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Correct Option: A,B,C,D

A polymer of prop-$2$-enenitrile is called:

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

  1. saran

  2. orlon

  3. dacron

  4. none of the above

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Correct Option: B

The commercial name of poly(methyl methacrylate) is:

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

  1. Lucite

  2. Plexiglas

  3. Perspex

  4. All the above

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Correct Option: D
Explanation:

Poly(methyl methacrylate) (PMMA) is a transparent thermoplastic often used in sheet form as a lightweight or shatter-resistant alternative to soda-lime glass. It has since been sold under many different names, including Acrylite, Lucite, Plexiglas and Perspex.

Option D is correct.

Soft drinks and baby-feeding bottles are generally made of:

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

  1. Polyurea

  2. polyurethane

  3. Polyester

  4. Polyamide

  5. polystyrene

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Correct Option: E
Explanation:

Soft drinks and baby-feeding bottles are generally made of polystyrene which is an addition homopolymer with a linear chain-like structure.
 The monomer is styrene.

GRA is a copolymer of __________________.

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

  1. butadiene and acrylonitrile

  2. butadiene and adipic acid

  3. chloroprene and acrylonitrile

  4. chloroprene and adipic acid

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Correct Option: A

$F _2C=CF _2$ is a monomer of:

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

  1. Teflon

  2. Glyptal

  3. Buna-S

  4. Nylon 6

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Correct Option: A
Explanation:

Polytetrafluoroethylene (PTFE) or Teflon is formed from the polymerization of tetrafluoroethylene.

Statement 1: Teflon has high thermal stability and chemical inertness.


Statement 2: It has strong C-F bonds.

Choose the correct option:

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

  1. Statement 1 is true: Statement 2 is true; statement 2 is the correct explanation of statement 1

  2. Statement 1 is true: statement 2 is true; statement 2 is not the correct explanation of statement 1

  3. Statement 1 is true; statement 2 is false

  4. Statement 1 is false; statement 2 is true

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Correct Option: A