Question

Consider the following
Statement-I: Natural rubber becomes soft at low temperature and brittle at high temperature.
Statement-II: Natural rubber has weak van der Waals forces between its polymer chains.

• A. Both statement-I and statement-II are correct
• B. Both statement-I and statement-II are not correct
• C. Statement-I is correct, but statement-II is not correct
• D. Statement-I is not correct, but statement-II is correct

Hint:

Rubber's physical properties depend on weak van der Waals forces—cold makes it brittle, heat makes it soft.

Answer 1

The Correct Option is D

Natural rubber becomes brittle at low temperature and soft at high temperature due to weak intermolecular forces (van der Waals) between polymer chains. Hence, statement-I is incorrect and II is correct.