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Thermodynamics question

2005 · Q113
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Thermodynamics question

2005 · Q113

NEETChemistryThermodynamicsMCQ+4 / −1
The absolute enthalpy of neutralisation of the reaction :

Mg(O)(s) + 2HCl(aq) →\to→ MgCl2(aq) + H2O(l) will be
  1. A
    −-−57.33 kJ mol−-−1
  2. B
    greater than −-− 57.33 kJ mol−-−1
  3. C
    less than −-− 57.33 kJ mol−-−1
  4. D
    57.33 kJ mol−-−1
View written solutionFree

Correct answer: C

We know that enthalpy of neutralization of a strong acid and a strong base is –57.33 kJ mol–1.

Here, MgO is the weak base and HCl is a strong acid thus, a small amount of energy is used in the ionization of MgO thus, the heat of neutralization decreases. Therefore, enthalpy of neutralization is less than – 57.33 kJ mol–1

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