Question

Assertion :Heat added to a system at lower temperature causes greater randomness than when the same quantity of heat is added to it at higher temperature. Reason: Entropy is a measure of the degree of randomness or disorder in the system.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

For spontaneous process, $\Delta G<0$

Also, $\Delta G=\Delta H-T\Delta S$

$\therefore \Delta H-T\Delta S<0$

For exothermic process, $\Delta H<0$

Therefore, at low temperatures and $\Delta S<0$, $\Delta G<0$.

Therefore, at high temperatures and $\Delta S<0$, $\Delta G>0$.

Therefore, assertion is correct.

Also, reason is correct but it is not the correct explanation for the assertion.