Chemistry · 2019
JEE Main · 11 January 2019, Shift 2 · Q55
The reaction, MgO ( s )+ C ( s ) → Mg ( s )+ CO ( g ), for which Δ_r H^°=+491.1 kJ mol^-1 and Δ_r S^°=198.0 JK^-1 mol^-1, is not feasible at 298 K.…
The reaction,
$\displaystyle \mathrm{MgO}(\mathrm{s})+\mathrm{C}(\mathrm{s}) \rightarrow \mathrm{Mg}(\mathrm{s})+\mathrm{CO}(\mathrm{g})$, for which $\displaystyle \Delta_{\mathrm{r}} \mathrm{H}^{\circ}=+491.1 \quad \mathrm{~kJ} \quad \mathrm{~mol}^{-1} \quad$ and $\displaystyle \Delta_{\mathrm{r}} \mathrm{S}^{\circ}=198.0 \mathrm{JK}^{-1} \mathrm{~mol}^{-1}$, is not feasible at $\displaystyle 298$ K. Temperature above which reaction will be feasible is:
Official answer
(2)
$\displaystyle 2480.3$ K
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JEE Main 2019 Chemistry question, with the answer from NTA’s final answer key. Where our answers come from.