In which of the following changes is ∆S negative ?
A H2O(l) → H2O(s)
B C(s) + 1/2O2,/sub>(g) → CO(g)
C PCI5(g) → PCl3(g) + Cl2(g)
D NaCl(s) + aq →Na+ (aq) + Cl- (aq)
Answer is A
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