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Which compound makes natural rubber more elastic and non-sticky?

$\begin{array}{1 1}(a)\;\text{Sulphur}\\(b)\; \text{Oxygen}\\(c)\;\text{ Sodium}\\(d)\;\text{Selenium}\end{array}$

1 Answer

Natural rubber is a gummy material which has poor elasticity.It becomes soft and stricky when heated and becomes permanently deformed when stretched.However,when natural rubber is heated with 3-5% sulphur,it becomes non-sticky and more elastic(valcanised rubber)
Hence (a) is the correct answer.
answered Mar 12, 2014 by sreemathi.v