In which of the following reactions, the...

In which of the following reactions, the enthalpy is the least ?

A

`CH_(3)COOH + NaOH to CH_(3)COONa + H_(2)O `

B

`HCl + NH_(4)OH to NH_(4)Cl + H_(2)O `

C

`HCl + NaOH to NaCl +H_(2)O `

D

`HCN +NH_(4) to NH_(4)CN + H_(2)O `

Verified by Experts

The correct Answer is:

D

`underset (WA) (HCN) +underset (WB) (NH_(4)OH)to NH_(4)CN +H_(2)O `
For weak acid and weak base the heat (enthalpy) of neutralization is least .

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