Sign in
12thPass logo
New chatPYQ LibraryDoubtsRank report
Sign in to see Recents

Your guest activity stays on this device

Sign in to save progress →
Sign in

Thermodynamics question

2011 · Q113
Guest · filters and generic practice availableBrowsing as a guest · PYQ filters and generic practice are available. Sign in only for personalised features and saved progress.
  1. PYQ Library
  2. /NEET
  3. /Chemistry
  4. /Thermodynamics
  5. /2011 · Q113

Thermodynamics question

2011 · Q113

NEETChemistryThermodynamicsMCQ+4 / −1
If the enthalpy change for the transition of liquid water to steam is 30 kJ mol−-−1 at 27oC, the entropy change for the process would be
  1. A
    10 J mol−-−1 K−-−1
  2. B
    1.0 J mol−-−1 K−-−1
  3. C
    0.1 J mol−-−1 K−-−1
  4. D
    100 J mol−-−1 K−-−1
View written solutionFree

Correct answer: D

H2O(l) →300K\xrightarrow{300K} 300K​ H2O(g)

∆H = 30 kJ mol–1

ΔS=ΔHT\Delta S = {{\Delta H} \over T}ΔS=TΔH​ = 30×103300{{30 \times {{10}^3}} \over {300}}30030×103​

= 100 J mol–1 K–1

PreviousNext

More from Thermodynamics

  • Enthalpy change for the reaction, 4H(g) → 2H2(g) is −869.6 kJ The dissociation energy of H − H bond is2011 · MCQ
  • Which of the following is correct option for free expansion of an ideal gas under adiabatic condition ?2011 · MCQ
  • The following two reactions are known Fe2O3(s) + 3CO(g) → 2Fe(s) + 3CO2(g); ΔH = − 26.8 kJ FeO(s) + CO(g) → Fe(s) + CO2(g); ΔH = − 16.5 kJ The value of ΔH for the following reaction Fe2O3(s) + CO(g) →…2010 · MCQ
  • For vaporization of water at 1 atmospheric pressure, the values of ΔH and ΔS are 40.63 kJ mol−1 and 108.8 J K−1 mol−1, respectively. The temperature when Gibb's energy change (ΔG) for this transformation will…2010 · MCQ
  • Three moles of an ideal gas expanded spontaneously into vacuum. The work done will be2010 · MCQ
  • Match List I (Equations) with List II (Type of processes) and select the correct option. Includes table2010 · MCQ
  • For an endothermic reaction, energy of activation is Ea and enthalpy of reaction is ΔH (both of these in kJ/mol). Minimum value of Ea will be2010 · MCQ
  • Standard entropies of X2, Y2 and XY3 are 60, 40 and 50 J K−1 mol−1 respectively. For the reaction 1/2X2 + 3/2Y2 ⇌ XY3, ΔH = − 30 kJ, to be at equilibrium, the temperature should be2010 · MCQ