Verified Solution • 2025–26 Session moderate

QJEEM19Chaf10: JEE Main 2019 Chemistry - Class 11 JEEM19Chaf10 Solution: The reaction, MgO(s) + C(s) Mg(s) + CO(g), for which r H o +…

The reaction, MgO(s) + C(s) →\to Mg(s) + CO(g), for which Δ\Delta rHo + 491.1 kJ mol–1 and Δ\Delta rSo = 198.0 JK–1 mol–1, is not feasible at 298 K. Temperature above which reaciton will be feasible is :

Multiple Choice Options

  • A 2480.3 K
  • B 2040.5 K
  • C 2380.5 K
  • D 1890.0 K

Step-by-Step Verified Solution

We know,

Δ\Delta Go = Δ\Delta Ho - T Δ\Delta So

For a reaction to be spontaneous Δ\Delta Go must be negative i.e.,
T Δ\Delta So > Δ\Delta Ho

⇒\Rightarrow T > ΔH∘ΔS∘{{\Delta H^\circ } \over {\Delta S^\circ }}

⇒\Rightarrow T > 491.1×1000198{{491.1 \times 1000} \over {198}}

⇒\Rightarrow T > 2480.3 K

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