The reaction, N2 (g) + 3H2 (g) à2NH3 (g), is the formation of ammonia. What occurs as the reaction proceeds?

a precipitate is formed

light and heat are given off

a new odor is given off

the solution bubbles

The correct answer among the choices is the third option. The given reaction produces ammonia gas. As the reaction proceeds, a new odor is given off. This odor is a characteristic of ammonia. Inhalation of this gas may pose some danger to humans. Also, it poses some hazard when ingested or has direct contact with eyes and skin.