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ChemistryJEE Main 5 Apr 2026, Shift 2·Q4·MCQ·Easy–moderate

Thermodynamics · Gibbs energy from enthalpy entropy

Consider the following data for the reaction

XX2(g)+YX2(g)⇌2 XY(g)\ce{X2(g) + Y2(g) <=> 2XY(g)}

at 600 K. The ΔrG⊖\Delta_\mathrm{r}G^\ominus (in kJ mol−1^{-1}) for the reaction is:

Compound
ΔfH600 K⊖\Delta_f H^\ominus_{600\,\mathrm{K}}
(kJ mol−1^{-1})
S600 K⊖S^\ominus_{600\,\mathrm{K}}
(J mol−1^{-1}K−1^{-1})
XY(g)42200
XX2\ce{X2}(g)8140
YX2\ce{Y2}(g)80250
  1. (1)−21000-21000
  2. (2)−10-10
  3. (3)−1000-1000
  4. (4)−9.012-9.012

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See the full 5 Apr 2026, Shift 2 paper