A) \[NaCl;\text{ }\Delta {{H}^{{}^\circ }}=5.35\text{ }kJ\text{ }mo{{l}^{-1}}\]
B) \[KN{{O}_{3}};\text{ }\Delta {{H}^{{}^\circ }}=53.5\text{ }kJ\text{ }mo{{l}^{-1}}\]
C) \[KOH;\Delta {{H}^{{}^\circ }}=-56.0\text{ }kJ\text{ }mo{{l}^{-1}}\]
D) \[HBr;\Delta {{H}^{{}^\circ }}=-83.3\text{ }kJmo{{l}^{-1}}\]
Correct Answer: B
Solution :
[b] Dissolution of \[KN{{O}_{3}}\] is endothermic, hence heat is absorbed and cooling is observed.
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