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The process with negative entropy change is

1. Dissociation of CaSO 4 (s) to CaO(s) and SO 3 (g)
2. Dissolution of iodine in water
3. Synthesis of ammonia from N 2 and H 2
4. Sublimation of dry ice

Correct answer: Synthesis of ammonia from N 2 and H 2

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