Which of the following processes has a negative Δ S?

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H₂O(s) → H₂O(l) H₂O(g) → H₂O(l) Correct 2H₂(g) + O₂(g) → 2H₂O(g) NH₄Cl(s) → NH₃(g) + HCl(g)

Entropy decreases when disorder decreases, e.g., in condensation (H₂O(g) → H₂O(l)), as gas to liquid reduces randomness.

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