The main element used in the vulcanisation of rubber is
In vulcanisation, cruder rubber is heated with 3% sulphur at about for 2-3 hours. Vulcanised rubber is a vastly improved product.
Brass gets discoloured in air because of the presence of which of the following gases in air ?
Which of the following is a non metal that remains liquid at room temperature ?
Permanent hardness of water is due to the presence of ?
Select the correct statement (s).
Triple point of water corresponds to
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