Q19 / 150 · MHT CET 2021 (22 Sep Shift 2) · Chemistry
Formation of $\mathrm{NO}_{2(\mathrm{~g})}$ from $\mathrm{N}_{2(\mathrm{~g})}$ and $\mathrm{O}_{2(\mathrm{~g})}$ is an endothermic process. Which of the following is true for this reaction?
- A$\Delta \mathrm{H}=0$
- B$\Delta \mathrm{H} < 0$
- C$\Delta \mathrm{H}=\Delta \mathrm{U}$
- Correct answerD$\Delta \mathrm{H}>0$
Solution
$$
\frac{1}{2} \mathrm{~N}_{2(\mathrm{~g})}+\mathrm{O}_{2(\mathrm{~g})} \longrightarrow \mathrm{NO}_2(\mathrm{~g})
$$
In endothermic process heat is absorbed during the reaction.
$$
\Delta \mathrm{H}>\mathrm{O}
$$
Hence, the correct answer is option: 'D'.