Question

(i) During vulcanization, rubber is treated with (a) Zinc (b) Phosphorus (c) Sulphur (d) Chlorine​

Answer 1

Answer:

c.Sulphur

Explanation:

Vulcanization is a chemical process in which the rubber is heated with sulphur, accelerator and activator at 140–160°C. The process involves the formation of cross-links between long rubber molecules so as to achieve improved elasticity, resilience, tensile strength, viscosity, hardness and weather resistance.

Answer 2

Answer: C (mark as brainliest)

Explanation:

Polymerization is a process of reacting monomer molecules together in a chemical reaction to form long polymer chains .

In chemical compounds, polymerization can occur by various types of reaction mechanisms that vary in complexity due to the functional groups present in the reactants and the steric effects that are present.

Natural rubber is formed by the polymerization reaction of isoprene molecules. Thus, the monomer of rubber is the compound isoprene.

However, the tensile strength of natural rubber is less along with low elasticity. This is not suitable for motor tires. This is the reason why we add the non-metal sulphur in small amounts.

The process of addition of sulphur to natural rubber thereby making the polymer strong and more elastic is called vulcanization. The polymer thus formed is called vulcanized rubber.

So, the correct answer is “Option A”.