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Chemistry · THERMODYNAMICS

हिन्दी

Based on the thermodynamic data summarized in Table 5.4, under which combination of enthalpy and entropy change is a reaction nonspontaneous at all temperatures?

Question diagram
  1. A
    \( \Delta_r H^\circ < 0 \) and \( \Delta_r S^\circ > 0 \)
  2. B
    \( \Delta_r H^\circ < 0 \) and \( \Delta_r S^\circ < 0 \)
  3. C
    \( \Delta_r H^\circ > 0 \) and \( \Delta_r S^\circ < 0 \)
  4. D
    \( \Delta_r H^\circ > 0 \) and \( \Delta_r S^\circ > 0 \)
View Answer & Solution

Correct answer · Option C

\( \Delta_r H^\circ > 0 \) 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.
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