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Q.

Which of the following elements is heated with natural rubber to make it hard, strong and more elastic?


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a

Sulphur

b

Lead

c

Zinc

d

Hydrogen 

answer is B.

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Detailed Solution

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Natural rubber is heated with sulphur to make it hard, strong and more elastic.
The element sulphur changes the properties of the natural rubber when sulphur and rubber are heated together. It enhances the desired properties of rubber. It is used to make it stronger and bouncy by the method of vulcanisation. Vulcanisation is a process of making a rubber more elastic and stretchable.
  
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