In which of the following is the entropy change positive?
A
Thermal dissociation of ammonium chloride
B
Reaction between an acid and a base
C
Addition of concentrated acid to water
D
Dissolution of sodium metal in water
Verified Correct Answer: A.
Step-by-Step Mathematical Solution
Thermal dissociation of ammonium chloride is an endothermic reaction as heat is absorbed for a positive entropy, with more products than reactants.
Source: WAEC / JAMB / NECO Classroom Archive (Record #4487)