Question
What is vulcanisation? Why is it done? Why is diphenyl amine added to rubber?
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Answer
Vulcanisation is a process of heating natural rubber with sulphur. This is done so as to make it more elastic, hard, more abrasion resistant by sulphur cross-linking. Diphenyl amine is added to rubber so as to prevent its oxidation.
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$2 \mathrm{~A}+\mathrm{B} \rightarrow \mathrm{~A}_2 \mathrm{~B}$
The rate $=\mathrm{k}[\mathrm{A}][\mathrm{B}]^2$ with $\mathrm{k}=2.0 \times 10^{-6} \mathrm{~mol}^{-2} \mathrm{~L}^2 \mathrm{~s}^{-1}$. Calculate the initial rate of the reaction when $[\mathrm{A}]=0.1 \mathrm{~mol}\ {\mathrm{L}^{-1}}$, $[B]=0.2 \mathrm{~mol} \mathrm{~L}^{-1}$. Calculate the rate of reaction after $[\mathrm{A}]$ is reduced to $0.06 \mathrm{~mol} \mathrm{~L}^{-1}$.
→$2 \mathrm{~A}+\mathrm{B} \rightarrow \mathrm{~A}_2 \mathrm{~B}$
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