In which of the following changes is ∆S negative ?

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Chemistry WAEC 1993

In which of the following changes is ∆S negative ?

  • H2O(l) → H2O(s) checkmark
  • C(s) + 1/2O2,/sub>(g) → CO(g)
  • PCI5(g) → PCl3(g) + Cl2(g)
  • NaCl(s) + aq →Na+ (aq) + Cl- (aq)
  • NH3(g) + HCl(g)

The correct answer is: A

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