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InterviewSolution
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The absolute enthalpy of neutralization of the reaction, `MgO(s)+2HCl(aq.)+H_(2)O(l)` will beA. less than `-57.33 kJ mol^(-1)`B. `-57.33 kJ mol^(-1)`C. greater than `-57.33 kJ mol^(-1)`D. `57.33 kJ mol^(-1)` |
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Answer» Correct Answer - C The absolute value of enthalpy of neutralisation of this reaction is greater than `-57.33 kJ mol^(-1)` . This is due to very high enthalpy of hydration of `Mg^(2+)` ion. Infact the `DeltaH` for this reaction is nearly `-146 kJ`. Thus enthalpy of neutralisation per mole of `H^(+) ion` is nearly`-73 kJ`, which is greater than enthalpy of neutralisation of strong acid `V_(s)` strong base i.e., `-57.33 kJ`. |
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