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Question

Which of the following reactions have maximum heat of neutralisation?

A
NH4OH and CH3OOH
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B
NH4OH and HCl
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C
NaOH and CH3OOH
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D
NaOH and HCl
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Solution

The correct option is D NaOH and HCl
More heat of neutralisation is generated between strong acid and strong base.
Since NaOH and HCl are strong base and acid so this pair will produce maximum ΔneutH.


Theory :

Enthalpy of Ionization of Weak Electrolytes:

When a weak acid(or base) reacts with a strong base(or acid), the release of heat is < 57.1 kJ/mol.

Because these are not completely ionized in solutions. Some of the heat is consumed in ionizing. This heat is known as the Enthalpy of Ionization.

For example

CH3COOH+OHCH3COO+H2O ΔrHo=49 kJ/mol


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