Which of the following is an example of an endothermic reaction?
- A$C_2H_2 + 2H_2 \to C_2H_6; \Delta E = -314.0 \ kJ$
- B$C + O_2 \to CO_2; \Delta E = -393.5 \ kJ$
- C$N_2 + O_2 \to 2NO; \Delta E = +180.5 \ kJ$
- D$2H_2 + O_2 \to 2H_2O; \Delta E = -571.8 \ kJ$
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Heats of combustion $(\Delta H^o)$ for $C_{(s)}$,$H_{2(g)}$ and $CH_{4(g)}$ are $-94$,$-68$ and $-213 \ kcal/mol$ respectively. The value of $\Delta H^o$ for the reaction,$C_{(s)} + 2H_{2(g)} \to CH_{4(g)}$ is $..... \ kcal$.
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View SolutionFind the enthalpy of formation of the $OH^-$ ion in $KJ$ at $25^\circ C$ from the following data:
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View SolutionThe enthalpy of neutralisation of $NH_4OH$ with $HCl$ is $-51.46 \ kJ \ mol^{-1}$ and the enthalpy of neutralisation of $NaOH$ with $HCl$ is $-55.90 \ kJ \ mol^{-1}$. The enthalpy of ionisation of $NH_4OH$ is $...... \ kJ \ mol^{-1}$
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