Question

A compound which burns with a yellowish flame producing nitrogen and water vapours is:

• A. Nitrogen
• B. Chlorine
• C. Ammonium nitrate
• D. Ammonia

Answer 1

The correct option is D

Ammonia

Explanation for correct answer:

• When ammonia burns in the air, the reaction is called combustion or oxidation of ammonia.
• In this reaction, nitrogen, and water.

$$\begin{gathered} 4N{H}_3\left(g\right)+3O_2\left(g\right)\to 2N_2\left(g\right)+6H_{2}O\left(l\right) \\ AmmoniaOxygenNitrogenWater \end{gathered}$$

The flame with which ammonia burns in this reaction is yellowish-green in color.

Explanation for incorrect options

• Nitrogen is non-combustible gas so option (A) is an incorrect answer.
• Chlorine is not flammable but supports combustions on certain conditions, so option (B) is an incorrect answer.
• Ammonium nitrate requires sufficient oxygen to accelerate the combustion process, so option (C) is an incorrect answer.

A compound that burns with a yellowish flame producing nitrogen and water vapors is ammonia; hence option (D) is correct.