Chemistry · 2021
JEE Main · 17 March 2021, Shift 1 · Q54
The standard enthalpies of formation of Al_2 O_3 and CaO are -1675 kJ mol^-1 and -635 kJ mol^-1 respectively. For the reaction 3 CaO +2 Al → 3 Ca +…
The standard enthalpies of formation of $\displaystyle \mathrm{Al}_2 \mathrm{O}_3$ and CaO are $\displaystyle -1675 \mathrm{~kJ} \mathrm{~mol}^{-1}$ and $\displaystyle -635 \mathrm{~kJ} \mathrm{~mol}^{-1}$ respectively.
For the reaction
$\displaystyle 3 \mathrm{CaO}+2 \mathrm{Al} \rightarrow 3 \mathrm{Ca}+\mathrm{Al}_2 \mathrm{O}_3$ the standard reaction enthalpy $\displaystyle \Delta_{\mathrm{r}} \mathrm{H}^0=$ \_\_\_\_ kJ.
(Round off to the Nearest Integer).
Official answer
230
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JEE Main 2021 Chemistry question, with the answer from NTA’s final answer key. Where our answers come from.