The correct answer is B. Vulcanized rubber contains 3-5% sulphur.
Sulphur is a chemical element with the symbol S and atomic number 16. It is the non-metallic element that occurs at the greatest natural abundance, estimated at 45% of the crust of the Earth. It is a bright yellow, odorless, tasteless, and highly flammable solid. Sulphur is the second most abundant element in the Earth’s atmosphere, at 0.07%.
Sulphur is an essential element for life, and is found in proteins, nucleic acids, and vitamins. It is also used in the production of sulfuric acid, which is a major industrial chemical.
In vulcanized rubber, sulphur reacts with the rubber molecules to form cross-links, which make the rubber stronger and more durable. The amount of sulphur used in vulcanization varies depending on the desired properties of the rubber. For example, rubber used for tires typically contains 3-5% sulphur, while rubber used for gaskets and seals may contain up to 10% sulphur.
The other options are incorrect because they do not represent the typical amount of sulphur used in vulcanized rubber.