Q.

Neutralization is the reaction between acid and base.It is highly exothermic.Enthalpy of neutralization is least for the reaction

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a

HCl+NaOH

b

HCl+NH4OH

c

HCN+NaOH

d

HCN+NH4OH

answer is D.

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Detailed Solution

For a strong acid and strong base reaction, the net reaction isH++OH-→H2O ; ∆H=-57.3 kJ/moleBoth HCN and NH4OH are weak electrolytes. They absorb energy for their ionization. Net heat liberated during the reaction is minimum.
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