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The absolute enthalpy of neutralisation ...

The absolute enthalpy of neutralisation of the reaction:
`MgO(s) + 2HCl(aq) to MgCl_2(aq) + H_2O(l)` will be

A

`-57.33 kJ "mol"^(-1)`

B

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

C

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

D

`57.33 kJ "mol"^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
C
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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