Question

A burning match stick, when introduced into a jar containing ${\mathrm{NH}}_3$ and ${\mathrm{O}}_2$, burns with a pale blue flame. Identify one of the products of the reaction.

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

Answer 1

The correct option is A

${\mathrm{N}}_2$

Explanation for the correct option

(A) ${\mathrm{N}}_2$

• On the introduction of a burning match stick in a jar containing ammonia, ${\mathrm{NH}}_3$ and oxygen, ${\mathrm{O}}_2$, there is a combustion reaction occurs.
• The balanced chemical reaction is as follows.

$4{\mathrm{NH}}_3\left(\mathrm{aq}\right)+3{\mathrm{O}}_2(\mathrm{g})\to 2{\mathrm{N}}_2(\mathrm{g})+6{\mathrm{H}}_2\mathrm{O}\left(\mathrm{I}\right)$

• one of the products of the reaction is Nitrogen gas.
• Hence the correct option is (A).

Explanation for the incorrect options.

(B) ${\mathrm{N}}_2\mathrm{O}$

• Nitrous oxide (${\mathrm{N}}_2\mathrm{O}$) is not one of the products formed in the reaction.
• Hence, this option is incorrect

(C) $\mathrm{NO}$

• Nitric oxide ($\mathrm{NO}$) is not formed as a product in the reaction.
• Hence, this option is incorrect.

(D) ${\mathrm{NO}}_2$

• Nitrogen dioxide (${\mathrm{NO}}_2$) is not formed as a product in the reaction.
• Hence this option is incorrect.

Hence, nitrogen gas is formed as a product so option (A) is correct