Vulcanisation of Rubber

Q.

Vulcanization makes rubber ........

(a) more elastic

(b) soluble inorganic solvent

(c) crystalline

(d) more stiff

Q. Which of the following is used in vulcanization of rubber?

1. SF₆
2. CF₄
3. Cl₂F₂
4. C₂F₂

Q.

Is rubber better than silicone?

Q. Heating of rubber with sulphur is known as

1. Sulphonation
2. Galvanisation
3. Vulcanisation
4. Bessemerisation

Q.

Why is rubber so elastic?

Q.

Why is silicone so expensive?

Q.

Discuss the main purpose of vulcanization of rubber.

Q.

Is Silicone Rubber Flammable?

Q. The non-metal used to treat rubber in the process of vulcanization is:

1. sulphur
2. phosphorus
3. carbon
4. chlorine

Q. 32. What is vulcanisation? Why is it done? Why is diphenylamine is added to rubber

Q.

The non-metal used to make vulcanized rubber is -

1. sulphur.

2. carbon.

3. phosphorous.

4. iodine.

Q. Who invented vulcanisation of rubber?

1. Antoine Lavoisier
2. Friedrich Wohler
3. Charles Goodyear
4. Henry Ceat

Q. Which of the following is used in vulcanization of rubber?

1. $S{F}_6$
2. $C{F}_4$
3. $C{l}_2{F}_2$
4. $C_2{F}_2$

Q. Assertion :Natural rubber becomes stiff by the vulcanization with sulphur. Reason: Sulphur forms cross links at the reactive sites of double bonds in vulcanization.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Assertion is incorrect but Reason is correct

Q. 'Buna-N rubber' is a coploymer of butadiene and acrylonitrile. In comparison to natural rubber it:

1. is delicate and soft
2. has better resistance to wear and tear
3. is a poor substitute for natural rubber
4. does not last for a long time

Q. What is homothellic and monoecious

Q. Sulphur is used for vulcanization of rubber to make it:

1. hard
2. elastic
3. malleable
4. soft

Q. In cold countries, ethylene glycol is used in carradiators for both winter as well as summer seasons.Explain.

Q. Rubber is very soft. Therefore, it is vulcanized and used in tires. Vulcanised rubber resists:

1. drops of acid rain
2. cold temperatures
3. jerking movement
4. wear and tear due to friction

Q. Write a note on vulcanization of rubber.

Q. In vulcanisation of rubber,

1. sulphur cross links are introduced
2. sulphur forms a very thin protective layer over rubber
3. All of the above.
4. sulphur reacts to form new compound

Q. What are the differences between Buna-N and Buna-S ?

Q. Rubber is heated with sulphur and the process is known as:

1. Galvanization
2. Vulcanization
3. Bessemerization
4. Sulphonation

Q. In daily life where do we use rubber?

Q. A : A mixture of raw rubber and sulphur on heating at $373K$ - $415K$ gives vulcanised rubber.
R : ZnO decreases the rate of vulcanisation of rubber.

1. both A and R are correct and R is the correct explanation of the A
2. both A and R are correct but R is not the correct explanation of the A
3. A is incorrect but R is correct
4. A is correct but R is incorrect

Q. Who invented vulcanisation of rubber?

1. Antoine Lavoisier
2. Friedrich Wohler
3. Charles Goodyear
4. Henry Ceat

Q. Vulcanised rubber resists:

1. wear and tear due to friction
2. cryogenic temperature
3. high temperature
4. action of acids

Q.

Which of the following is used in the vulcanisation of rubber?

1. Hydrogen

2. Phosphorus

3. Iodine

4. Sulphur

Q. Why sulphur is added to the natural rubber?

Q. Assertion
Neoprene can be further hardened by heating in presence of sulphur.
Reason
Neoprene contains allylic double bonds which help in introducing sulphur bridges between different polymer chains.
Neoprene can be further hardened by heating in presence of sulphur.

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1. Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
2. Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
3. Assertion is true but Reason is false.
4. Both Assertion and Reason are false.