Question

Assertion (A): For a pure substance, melting point and freezing point are identical.

Reason (R): For a given mass of substance, the amount of heat energy absorbed during melting is different as that liberated during freezing.

Options

• Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).

• Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).

• Assertion (A) is false, but Reason (R) is true.

• Assertion (A) is true, but Reason (R) is false.

Answer 1

Assertion (A) is true, but Reason (R) is false.

Explanation:

For a pure substance, the melting point and freezing point are the same temperature, so the Assertion is true. For the same mass of a substance, the heat absorbed during melting is equal to the heat liberated during freezing. Hence, the Reason is false.