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

2005 · Q112
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. /2005 · Q112

Thermodynamics question

2005 · Q112

NEETChemistryThermodynamicsMCQ+4 / −1
A reaction occurs spontaneously if
  1. A
    TΔ\DeltaΔS < Δ\DeltaΔH and both Δ\DeltaΔH and Δ\DeltaΔS are +ve
  2. B
    TΔ\DeltaΔS > Δ\DeltaΔH and Δ\DeltaΔH is +ve and Δ\DeltaΔS are −-−ve
  3. C
    TΔ\DeltaΔS > Δ\DeltaΔH and both Δ\DeltaΔH and Δ\DeltaΔS are +ve
  4. D
    TΔ\DeltaΔS = Δ\DeltaΔH and both Δ\DeltaΔH and Δ\DeltaΔS are +ve
View written solutionFree

Correct answer: C

Δ\Delta ΔG = Δ\Delta ΔH – TΔ\Delta ΔS

For spontaneous reaction, Δ\Delta ΔG has to be negative.

Among the given options, it is positive only when TΔ\Delta ΔS > Δ\Delta ΔH and both Δ\Delta ΔH and Δ\Delta ΔS are +ve .

PreviousNext

More from Thermodynamics

  • The absolute enthalpy of neutralisation of the reaction : Mg(O)(s) + 2HCl(aq) → MgCl2(aq) + H2O(l) will be2005 · MCQ
  • If the bond energies of H − H, Br − Br, and H − Br are 433, 192 and 364 kJ mol−1 respectively, the ΔHo for the reaction H2(g) + Br2(g) → 2HBr(g) is2004 · MCQ
  • Standard enthalpy and standard entropy changes for the oxidation of ammonia at 298 K are − 382.64 kJ mol−1 and − 145.6 kJ mol−1, respectively. Standard Gibb's energy change for the same reaction at 298 K is2004 · MCQ
  • Considering entropy (S) as a thermodynamic parameter, the criterion for the spontaneity of any process is2004 · MCQ
  • The work done during the expansion of a gas from a volume of 4 dm3 to 6 dm3 against a constant external pressure of 3 atm is (1 L atm = 101.32 J)2004 · MCQ
  • For the reaction, C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(l) at constant temperature, ΔH − ΔE is2003 · MCQ
  • The densities of graphite and diamond at 298 K are 2.25 and 3.31 g cm−3, respectively. If the standard free energy difference (ΔGo) is equal to 1895 J mol−1, the pressure at which graphite will be…2003 · MCQ
  • Formation of solution from two components can be considered as (i) Pure solvent → separated solvent molecules, ΔH1 (ii) Pure solute → separated solute molecules, ΔH2 (iii) Separated solvent and solute molecules →…2003 · MCQ