AP EAMCET · Chemistry · Thermodynamics (C)

Among the following processes, for which process, the change in entropy \((\Delta S)\) is negative?

A Sublimation of iodine
B Freezing of water
C Burning of rocket fuel
D Dissolution of sugar

Verified Solution

Answer & Solution

Correct Answer

(B) Freezing of water

Step-by-step Solution

Detailed explanation

When water freezes its entropy decreases. A negative change in entropy indicates that the disorder of an isolated system has decreased. When liquid water freezes into ice represents an isolated decrease in entropy because liquid particles are more disordered than solid…

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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