Question

Ammonia can be obtained by adding water to:

• A. ammonium chloride
• B. ammonium nitrite
• C. magnesium nitride
• D. magnesium nitrate

Answer 1

The correct option is C

magnesium nitride

Laboratory Preparation of Ammonia $\left({\mathrm{NH}}_3\right)$ from magnesium nitride$\left({\mathrm{Mg}}_3{\mathrm{N}}_2\right)$:

• In the laboratory, ammonia gas can also be prepared by pouring warm water on metallic nitrides such as magnesium nitride $\left({\mathrm{Mg}}_3{\mathrm{N}}_2\right)$.
• When water is poured over magnesium nitride, ammonia gas and hydroxide of magnesium is formed.
• ${\mathrm{Mg}}_3{\mathrm{N}}_2\left(\mathrm{s}\right)+6{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)⟶3\mathrm{Mg}(\mathrm{OH}{)}_2\left(\mathrm{aq}\right)+2{\mathrm{NH}}_3(\mathrm{g})\uparrow$

Therefore, option (c) is correct as ammonia can be obtained by adding water to magnesium nitride.