A non-elastic, hard material known as ebonite is formed when crude rubber is heated with

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5% of sulphur

20% of sulphur

30% of sulphur

40 - 45% of sulphur

answer is D.

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Detailed Solution

When 40-45% sulphur is added to natural rubber it becomes very hard due to extensive cross linking. This hard material is called ebonite.

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