1.

In which of the following pairs the enthalpy of neutralization is less than or more than the standard value

Answer»

`HNO_(3) and NaOH`
`HCl and NaOH`
`HCN and NaOH`
`H_(2)SO_(4) and NaOH`

Solution :The enthalpy of neutralization of STRONG ACIDS by strong BASES is equal to the standard enthalpy of neutralization i.e., -13.9 kcal/mol. But HCN is a weak acid and NaOH is a strong base so, the enthalpy of neutralization for this pair is less than the standard VALUE, i.e., -12.13 kcal


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