MolSynapsequestion bank

MolSynapse / Question bank / Polymers / Rubber and vulcanisation

JEE Main levelSingle correct optionDifficulty 2 of 3pl080

All of the following are consequences of vulcanising natural rubber with a few percent of sulfur EXCEPT

Asulfur bridges form between neighbouring polyisoprene chains
Btensile strength and hardness increase
Cthe useful temperature range of the rubber becomes wider
Dthe rubber becomes freely soluble in non-polar solvents such as benzene

Answer: D

Cross-links tie the chains into one network, raising strength and hardness and widening the useful temperature range. A network polymer cannot dissolve freely; it only swells in solvents. So the statement about free solubility is the exception.

Practice Polymers More on Rubber and vulcanisation

Previous questionNext question

More questions on Rubber and vulcanisation

Buna-S is a copolymer of NEET level
Natural rubber and gutta-percha are both polymers of isoprene. They differ in that JEE Main level
Buna-N is prepared from JEE Main level
In vulcanisation of polyisoprene, sulfur cross-links are believed to attach mainly at JEE Main level
Assertion (A): Raw natural rubber is soft and sticky and becomes brittle in cold weather. Reason (R): Its linear cis-polyisoprene chains are... JEE Main level
The repeat unit of neoprene is -[CH2-C(Cl)=CH-CH2]- (C4H5Cl; C 12, H 1, Cl 35.5). A neoprene sample has molar mass 44250 g mol^-1. Its degre... JEE Main level