OnlineCBT
Chemistry · THERMODYNAMICS
हिन्दीRefer to the given enthalpy diagrams Fig. 5.10 (a) and Fig. 5.10 (b). Which of the following statements correctly differentiates the two diagrams?
Correct answer · Option 1
In (a), \( \Delta_r H < 0 \) (net heat evolved, exothermic); in (b), \( \Delta_r H > 0 \) (net heat absorbed, endothermic).
Explanation
Fig 5.10(a) shows reactants at higher enthalpy than products (\( \Delta_r H < 0 \), exothermic), whereas Fig 5.10(b) shows products at higher enthalpy than reactants (\( \Delta_r H > 0 \), endothermic).
