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Question

In which of the following reaction enthalpy of neutralization is least negative?

A
HF and NaOH
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B
H3PO4 and KOH
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C
H2SO4 and NH4OH
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D
HCN and NH4OH
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Solution

The correct option is A HF and NaOH
Ionisation of HF produces F & H+ .
The size of F is small. So, it is highly hydrated which releases high amount of energy, which results for higher neutralization enthalpy than strong acids.

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