Verified Solution • 2025–26 Session moderate

QJEEM20Chce31: JEE Main 2020 Chemistry - Class 11 JEEM20Chce31 Solution: For a reaction, 4M(s) + nO 2 (g) 2M 2 O n (s) the free energy…

For a reaction,
4M(s) + nO2(g) →\to 2M2On(s)
the free energy change is plotted as a function of temperature. The temperature below which the oxide is stable could be inferred from the plot as the point at which :

Multiple Choice Options

  • A the free energy change shows a change from negative to positive value
  • B the slope changes from positive to negative
  • C the slope changes from negative to positive
  • D the slope changes from positive to zero

Step-by-Step Verified Solution

Δ\Delta G = Δ\Delta H – T Δ\Delta S

Δ\Delta G = –ve (stable oxide)

Δ\Delta G = +ve (unstable oxide)

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