MCQ
On the basis of following equations the heat of dimerisation of $NO_2$ will be
$(i)\, N_2 + 2O_2 \to 2NO_2\,\,\, \Delta H = 67.9\,kJ$
$(ii)\, N_2 + 2O_2 \to N_2O_4\,\,\, \Delta H = 9.3\,kJ$
......$kJ$
- A$+77.2$
- B$-77.2$
- ✓$-58.6$
- D$+58.6$
✓
Answer
Correct option: C.
$-58.6$
c
$2 \mathrm{NO}_{2} \rightarrow \mathrm{N}_{2} \mathrm{O}_{4}, \Delta \mathrm{H}$
$2 \mathrm{NO}_{2} \rightarrow \mathrm{N}_{2} \mathrm{O}_{4}, \Delta \mathrm{H}$
$\Delta \mathrm{H}_{2}-\Delta \mathrm{H}_{1}=\Delta \mathrm{H}$
$9.3-67.9=\Delta H$
$-58.6\, \mathrm{kJ}=\Delta \mathrm{H}$
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