Question

The substance used to harden the rubber for tyre manufacture is:

• A. wax
• B. 1,3-butadiene
• C. calcium carbide
• D. carbon black

Answer 1

The correct option is D carbon black

Answer is option $D.$

$\text{carbon black}:$ carbon black is a rubber reinforcing additive. As a filler in tires, it also helps to extend the life of tire by conducting heat away from tread and belt area.