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
The correct answer is: A
Explanation
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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