1.

The absolute enthalpy of neutralisation of the reaction MgO(s) + 2HCl(aq) to MgCl_(2)(aq) + H_(2)O(l) will be

Answer»

less than -57.33 KJ `"mol"^(-1)`
`-57.33 KJ "mol"^(-1)`
greater than `-57.33 KJ "mol"^(-1)`
57.33 KJ `"mol"^(-1)`

Solution :HEAT of neutralisation of strong acid and strong base is-57.33 KJ. MGO is weak base while HCL is strong acid. So the heat of neutralisation of MgO and HCl is lower than `-57.33 KJ ` because MgO requires some heat for ionisation, therefore the net RELEASED amount of heat is decreased.


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