1.

The absolute enthalpy of neutralisation of the reaction: MgO(s) + 2HCl(aq)toMgCl_2(aq) + H_2O(l)will be

Answer»

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

Solution : MgO is the oxide of weak BASE and we know that heat of neutralisation of 1 eq. of STRONG ACID with strong base is - 57.33 kJ/mol. With weak base some heat is ABSORBED in DISSOCIATION of weak base. Therefore, the heat of neutralisation of weak base with strong acid will be less than -57.33 kJ/mol.


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