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NEET2005ChemistryThermodynamics (C)Actual

The absolute enthalpy of neutralisation of the reaction: : MgO _ (s) +2 HCl _ (a q) MgCl _ 2(a q) + H ₂ O _ ( will be:

Options

  1. A-57.33 ~kJ ~mol ⁻¹
  2. Bgreater than -57.33 ~kJ ~mol ⁻¹
  3. Cless than -57.33 ~kJ ~mol ⁻¹
  4. D57.33 ~kJ ~mol ⁻¹

Correct answer

C. less than -57.33 ~kJ ~mol ⁻¹

Step-by-step solution

MgO is salt of weak base. Thus, enthalpy of neutralisation for MgO will be less than -57.33 ~kJ ~mol ⁻¹ . Related Theory The enthalpy of neutralization of any strong acid with a strong base is always the same, i.e., 57.1 ~kJ . This is because the strong acids, strong bases and the salts they form, are all completely ionized in dilute aqueous solution.

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