OnlineCBT
Chemistry · THERMODYNAMICS
हिन्दीBased on the thermodynamic data summarized in Table 5.4, under which combination of enthalpy and entropy change is a reaction nonspontaneous at all temperatures?
Correct answer · Option 3
\( \Delta_r H^\circ > 0 \) and \( \Delta_r S^\circ < 0 \)
Explanation
When \( \Delta_r H^\circ > 0 \) and \( \Delta_r S^\circ < 0 \), the term \( \Delta G^\circ = \Delta H^\circ - T\Delta S^\circ \) is always positive at all temperatures.
