Question

Assertion: A reaction which is spontaneous and accompanied by decrease of randomness must be exothermic.
Reason: All exothermic reactions are accompanied by decrease of randomness.

• A. If both assertion and reason are true and reason is the correct explanation of assertion.
• B. If both assertion and reason are true but reason is not the correct explanation of assertion.
• C. If assertion is true but reason is false.
• D. If both assertion and reason are false.

Answer 1

Answer: (C)

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

$-v e=\Delta H-[T(- v e)]$ (as spontaneous)

Exothermic reactions may be accompanied by increase or decrease of randomness.