AP EAMCET · Chemistry · Thermodynamics (C)

If a chemical reaction is known to be non-spontaneous at $298 K$ but spontaneous at $350 K$ , then which among the following conditions is true for the reaction?

A $ΔG = - ve, ΔH = - ve, ΔS = + ve$
B $ΔG = + ve, ΔH = + ve, ΔS = + ve$
C $ΔG = - ve, ΔH = + ve, ΔS = + ve$
D $ΔG = + ve, ΔH = + ve, ΔS = - ve$

Verified Solution

Answer & Solution

Correct Answer

(C) $ΔG = - ve, ΔH = + ve, ΔS = + ve$

Step-by-step Solution

Detailed explanation

So according to the question we have to find the non spontaneous process then We know the second law of thermodynamics ∆G = ∆H -T∆S So we know that for spontaneous ∆G<0 So for that we have the condition which is…

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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If a chemical reaction is known to be non-spontaneous at 298 K but spontaneous at 350 K, then which among the following conditions is true for the reaction?

Step-by-step Solution

If a chemical reaction is known to be non-spontaneous at $298 K$ but spontaneous at $350 K$ , then which among the following conditions is true for the reaction?