Question

38. Vulcanization is brought about by heating natural rubber with

• A. a. Boron
• B. b. Sulfur
• C. c. Phosphorus
• D. d. Silicon

Answer 1

The correct option is B

b. Sulfur

Answer-b

Natural rubber becomes soft at high temperature (>335 K) and brittle at low temperatures (<283 K) and shows high water absorption capacity. It is soluble in non-polar solvents and is non-resistant to attack by oxidising agents. To improve upon these physical properties, a process of vulcanisation is carried out.

It is process by which the physical properties of natural or synthetic rubber are improved; finished rubber has higher tensile strength and resistance to swelling and abrasion, and is elastic over a greater range of temperatures. In its simplest form, vulcanization is brought about by heating rubber with sulfur