Question

Assertion (A): Polyamides are best used as fibres because of high tensile strength.

Reason (R): Strong intermolecular forces (like hydrogen bonding within polyamides) lead to close packing of chains and increase the crystalline character, hence, provide high tensile strength to polymers.

• A. Both the assertion and the reason are incorrect statements.
• B. The assertion is a correct statement, but the reason is an incorrect statement.
• C. Both the assertion and the reason are correct statements, but the reason is not the correct explanation of the assertion.
• D. Both the assertion and the reason are correct statements, and the reason is the correct explanation for the assertion
• E. The assertion is an incorrect statement, but the reason is a correct statement.

Answer 1

The correct option is D Both the assertion and the reason are correct statements, and the reason is the correct explanation for the assertion

Assertion:

Polyamides are best used as fibres because of their high tensile strength. The threads of polyamides have high strength and can be woven into fabrics.

Hence, the assertion is a correct statement.

Reason:

Strong intermolecular forces (like hydrogen bonding within polyamides) lead to close packing of chains and increase the crystalline character, hence providing high tensile strength to polymers.

Hence, the reason is a correct statement.

Both the assertion and the reason are correct statements, and the reason is the correct explanation for the assertion.

So, option (b) is the correct answer.