Multiple choice

In vulcanization process rubber is hardened by adding

  1. nitrogen

  2. silicon

  3. sulphur

  4. alcohol

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Vulcanization is the process of hardening rubber by heating it with sulphur. The sulphur forms cross-links between rubber polymer chains, transforming sticky natural rubber into durable, elastic material used for tires, shoes, and various industrial applications. Charles Goodyear discovered this in 1839.