Question

On burning ${\mathrm{NH}}_3$in the presence of oxygen gives:

• A. ${\mathrm{N}}_2$ and ${\mathrm{H}}_2\mathrm{O}$
• B. $\mathrm{NO}$ and ${\mathrm{H}}_2\mathrm{O}$
• C. ${\mathrm{NO}}_2$ and ${\mathrm{H}}_2\mathrm{O}$

Answer 1

The correct option is A

${\mathrm{N}}_2$ and ${\mathrm{H}}_2\mathrm{O}$

Explanation for Correct answer:

Option B ${\mathrm{N}}_2$ and ${\mathrm{H}}_2\mathrm{O}$

• Heating NH₃ in the presence of oxygen produces Nitrogen gas (${\mathrm{N}}_2$) and water (${\mathrm{H}}_2\mathrm{O}$).

$\underset{\mathrm{Ammonia}}{4{\mathrm{NH}}_3\left(\mathrm{g}\right)}+\underset{\mathrm{Oxygen}}{3{\mathrm{O}}_2\left(\mathrm{g}\right)}\to \underset{\mathrm{Nitrogen}}{2{\mathrm{N}}_2\left(\mathrm{g}\right)}+\underset{\mathrm{water}}{6{\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right)}$

• Hence option A is correct

Explanation for incorrect answer:

Option A $\mathrm{NO}$ and ${\mathrm{H}}_2\mathrm{O}$.

• Heating Ammonia ${\mathrm{NH}}_3$ in the presence of oxygen and catalysts will produce Nitric oxide ($\mathrm{NO}$) and water (${\mathrm{H}}_2\mathrm{O}$).
• $\underset{\mathrm{Ammonia}}{4{\mathrm{NH}}_3\left(\mathrm{g}\right)}+\underset{\mathrm{Oxygen}}{5{\mathrm{O}}_2\left(\mathrm{g}\right)}\stackrel{\mathrm{Pt}/\mathrm{Ru}}{\to }\underset{\mathrm{Nitric}\mathrm{oxide}}{4\mathrm{NO}\left(\mathrm{g}\right)}+\underset{\mathrm{water}}{6{\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right)}$
• Hence option B is incorrect

Option C ${\mathrm{NO}}_2$ and ${\mathrm{H}}_2\mathrm{O}$

• Heating NH₃ in the presence of oxygen produces Nitrogen gas (${\mathrm{N}}_2$) and water (${\mathrm{H}}_2\mathrm{O}$).
• Hence option C is incorrect.