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QUESTIONAssertion (A): Appropriate vulcanisation improves rubber’s elastic recovery and durability. Reason (R): Sulphur forms cross-links between rubber polymer chains, improving mechanical properties.
Open question →QUESTIONIn NCERT’s introductory example of flame-resistant coatings on firefighters’ uniforms, which plastic is named?
Open question →QUESTIONWhy is fibreglass commonly used instead of metal for making high jump bars?
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