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JAMB - Chemistry (2010 - No. 25)

In which of the following is the entropy change positive?
Thermal dissociation of ammonium chloride
Reaction between an acid and a base
Addition of concentrated acid to water
Dissolution of sodium metal in water

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Thermal dissociation of ammonium chloride is an endothermic reaction as heat is absorbed for a positive entropy, with more products than reactants.

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