Tag: manmade materials

Questions Related to manmade materials

Heating rubber with sulphur is known as:

chemistry manmade materials synthetic rubber rubber polymer

  1. galvanization

  2. bessemerisation

  3. vulcanization

  4. sulphonation

Show answer
Correct Option: C
Explanation:

The formation of vulcanised rubber-

To improve these physical properties,
  • water repelent
  • Less water absorption
  • Resist for oxidising agents
  • Strength
 a process of vulcanisation is carried out. This process consists of heating a mixture of raw rubber with sulphur and an appropriate additive at a temperature range between 373 K to 415 K.On vulcanisation, sulphur forms cross links at the reactive sites of double bonds and thus the rubber gets stiffened, The correct option is [C].

In vulcanization of rubber :

chemistry manmade materials synthetic rubber rubber polymer

  1. sulphur reacts to form a new compound

  2. sulphur cross-links are introduced

  3. sulphur forms a very thin protective layer over rubber

  4. all statements are correct

Show answer
Correct Option: B
Explanation:

Vulcanisation of rubber-

To improve these physical properties,
  • Strength
  • Resistance for oxidation
  • Repulsion from water
 a process of vulcanisation is carried out. This process consists of heating a mixture of raw rubber with sulphur and an appropriate additive at a temperature range between $373 K to 415 K.$ On vulcanisation, sulphur forms cross links at the reactive sites of double bonds and thus the rubber gets stiffened.

The correct option is [B].

Sulphur is used in  the vulcanization of rubber.

chemistry polymer synthetic rubber rubber manmade materials

  1. True

  2. False

Show answer
Correct Option: A

Vulcanization of rubber helps to make rubber hard and resistant to hot and cold conditions.

chemistry polymer synthetic rubber rubber manmade materials

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Vulcanization is a process in which the strength, stability, and elasticity of rubber are increased by subjecting it to heat, in the presence of sulphur. As a result, cross-linking occurs between the chains of rubber molecules and sulphur atoms.

The process involving heating of rubber with sulphur is called ___

chemistry manmade materials synthetic rubber rubber polymer

  1. Galvanisation

  2. Vulcanization

  3. Bessemerisation

  4. Sulphonation

Show answer
Correct Option: B
Explanation:

Vulcanisation of Rubber - Natural rubber  becomes soft at high temperature (>$335$ K) and brittle at low temperature (<$283$ K) and shows high water absorption capacity.
The process of  vulcanisation includes heating of raw rubber with sulphur and an appropriate additive at temperature range between $373$ K  to $415$ K. Sulphur foms crosslinks at reactive sites of double bonds and thus, rubber gets stiffened.

The synthetic polymer which resembles natural rubber is:

chemistry manmade materials synthetic rubber rubber polymer

  1. Neoprene

  2. Buna-S

  3. Nylon

  4. Rayon

Show answer
Correct Option: A
Explanation:

Neoprene resembles natural rubber. 


Natural rubber is a linear polymer of $2$-methyl-$1,:3$-butadiene called as isoprene and Neoprene is a linear polymer of $2$-chloro-$1,:3$-butadiene called as chloroprene.

Option A is correct.

Chloroprene is used in making

chemistry manmade materials synthetic rubber rubber polymer

  1. synthetic rubber

  2. plastic

  3. petrol

  4. All of the above

Show answer
Correct Option: A
Explanation:

Chloroprene is the monomer of neoprene, a synthetic rubber formed by the free radical polymerisation of choloroprene.


$nCH _2-CCl-CH=CH _2 \xrightarrow {Polymerisation} -[CH _2-CCl=CH-CH _2]-$

The process of vulcanization was introduced by ____

chemistry manmade materials synthetic rubber rubber polymer

  1. Charles Goodyear

  2. Kolbe

  3. Wohler

  4. Zeigher

Show answer
Correct Option: A
Explanation:

Charles Goodyear invented vulcanization process in $1839$.
Vulcanisation is a process involving heating of rubber with sulphur is called vulcanisation.

The tensile strength, elasticity and resistance to abrasion can be increased by a process called ___

chemistry manmade materials synthetic rubber rubber polymer

  1. Galvanisation

  2. Vulcanization

  3. Bessemerisation

  4. Sulphonation

Show answer
Correct Option: B

Which of the following is used in making automobile tyres and foot wear?

chemistry manmade materials synthetic rubber rubber polymer

  1. Vulcanised rubber

  2. Neoprene

  3. Plexi glass

  4. Glyptal

Show answer
Correct Option: A
Explanation:

Vulcanised rubber is used in making automobile tyres and foot wear. Heating of rubber with sulphur is called as vulcanisation. It makes the rubber hard and more flexible.