COMEDK · Chemistry · 6. Thermodynamics (C)

An endothermic reaction is found to have + ve entropy change. The reaction will be

A possible at high temperature
B possible only at low temperature
C not possible at any temperature
D possible at any temperature

Verified Solution

Answer & Solution

Correct Answer

(A) possible at high temperature

Step-by-step Solution

Detailed explanation

Given, \(\Delta S=+\) ve and \(\Delta H=+\) ve \((\) For endothermic reaction) Now, \(\quad \Delta G=\Delta H-T \Delta S\) For a reaction to be spontaneous, \(\Delta G\) should be -ve which is possible only at high temperature i.e., when \(T \Delta S>\Delta H\).

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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