1.

What is added to rubber to make it a thermosetting polymer?(a) Potassium(b) Sulphur(c) Sodium(d) Phosphorous

Answer» The correct option is (b) Sulphur

Best explanation: The process of vulcanization makes rubber get converted into a heavily cross-linked, insoluble and infusible compound.  It is done by adding sulphur and litharge (PbO).


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