1.

Assertion(A): Natural rubber becomes strong and elastic when heated with sulphur. Reason (R): Natural rubber is mixed with 3-5% sulphur and heated at 100-150°C causes cross linking of the cis-1,4 - polyisoprene chains through disulphide - S - s bonds.

Answer»

Both A and R are CORRECT and R EXPLAINS A.
Both A and R are correct but R does not explain A.
A is correct but R is wrong.
A is wrong but R is correct.

ANSWER :A


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