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Vulcanization of rubber is carried out by heating a mixture of

1. isoprene and styrene
2. neoprene and sulphur
3. isoprene and sulphur
4. neoprene and styrene

Correct answer: isoprene and sulphur

Solution

Vulcanization heats natural rubber (cis-polyisoprene) with sulphur, which forms cross-links between chains; the mixture is isoprene (rubber) and sulphur.

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