Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NEET 2005
Exam
NEET
Year
2005
Subject
Chemistry
Chapter
Thermodynamics (C)

NEET 2005 · Chemistry · Thermodynamics (C)

The absolute enthalpy of neutralisation of the reaction: : MgO_ (s)...

The absolute enthalpy of neutralisation of the reaction: : MgO(s)+2HCl(aq)\mathrm{MgO}_{(s)}+2 \mathrm{HCl}_{(a q)} →MgCl2(aq)+H2O(∩\rightarrow \mathrm{MgCl}_{2(a q)}+\mathrm{H}_2 \mathrm{O}_{(\cap} will be:

Options

  1. A−57.33 kJ mol−1-57.33 \mathrm{~kJ} \mathrm{~mol}^{-1}
  2. Bgreater than −57.33 kJ mol−1-57.33 \mathrm{~kJ} \mathrm{~mol}^{-1}
  3. Cless than −57.33 kJ mol−1-57.33 \mathrm{~kJ} \mathrm{~mol}^{-1}
  4. D57.33 kJ mol−157.33 \mathrm{~kJ} \mathrm{~mol}^{-1}

Correct answer

C. less than −57.33 kJ mol−1-57.33 \mathrm{~kJ} \mathrm{~mol}^{-1}

Step-by-step solution

MgO\mathrm{MgO} is salt of weak base. Thus, enthalpy of neutralisation for MgO\mathrm{MgO} will be less than −57.33 kJ mol−1-57.33 \mathrm{~kJ} \mathrm{~mol}^{-1}. Related Theory The enthalpy of neutralization of any strong acid with a strong base is always the same, i.e., 57.1 kJ57.1 \mathrm{~kJ}. This is because the strong acids, strong bases and the salts they form, are all completely ionized in dilute aqueous solution.
Practice Thermodynamics (C) on Quantrex Academy →

More from Thermodynamics (C)

A certain organic solvent has Δ H\_vap = 28.50\ kJ mol^ -1 and Δ S\_vap = 88.2\ J K^ -1 \… MHT CET Medical 2026Which of the following statements regarding spontaneous process is NOT true? MHT CET Medical 2026Calculate Δ H for a reaction, 2X_ (g) + Y_ (g) arrow 2Z_ (g) at 298 K if Δ U = -10.5 kJ… MHT CET Medical 2026500\ mL of nitrogen gas and 750\ mL hydrogen gas were allowed to react at 1\ bar pressure… MHT CET Medical 2026The relationship between Δ H and Δ U for the reaction, PCl_3(g) + Cl_2(g) arrow PCl_5(g)… MHT CET Medical 2026What would be the heat released in kJ when 450\ cm^3 of 0.02\ M\ H_2SO_4 is mixed with… MHT CET Medical 2026Identify from following reactions that it takes place with Δ H = Δ U . MHT CET Medical 2026Calculate the work done in the following reaction at 300\ K , A(g) + B(g) = 2C(g) [R =… MHT CET Medical 2026 Full Thermodynamics (C) list All NEET PYQs