Which of the following is an exothermic reaction?
- A$2HgO_{(s)} + 180 \, kJ \rightarrow 2Hg_{(\ell)} + O_{2(g)}$
- B$N_2O_{(g)} + C_{(s)} \rightarrow CO_{(g)} + N_{2(g)} - 131 \, kJ$
- C$N_{2(g)} + O_{2(g)} \rightarrow 2NO_{(g)} ; \Delta U = +181 \, kJ$
- D$C_2H_{2(g)} + 2H_{2(g)} \rightarrow C_2H_{6(g)} ; \Delta U = -314 \, kJ$
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Medium
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View SolutionThe standard enthalpies of formation of $Al_{2}O_{3}$ and $CaO$ are $-1675 \ kJ \ mol^{-1}$ and $-635 \ kJ \ mol^{-1}$ respectively.
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For the reaction $3 CaO + 2 Al \rightarrow 3 Ca + Al_{2}O_{3}$,the standard reaction enthalpy $\Delta_{r}H^{\circ}$ is .......... $kJ$.
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