A) \[HCl\,\,\text{and}\,\,NaOH\]
B) \[N{{H}_{4}}OH\,\,\text{and}\,\,HCl\]
C) \[NaOH\,\text{and}\,C{{H}_{3}}COOH\]
D) \[C{{H}_{3}}COOH\,\text{and}\,N{{H}_{4}}OH\]
Correct Answer: A
Solution :
Heat of neutralisation is maximum (i.e., approximately 13.7 kcal/mole) for the neutralisation of a strong acid and a strong base. If one of them is weak, then heat of neutralisation also decreases (due to being consumed in ionization of weak electrolyte). Hence, here the heat of neutralisation of \[HCl\] and \[NaOH\]will be the highest.
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