Question

Category of compound which liberates ammonia from ammonium salts are:

• A. Acids
• B. Alkalis
• C. Acidic gases
• D. Salt solutions

Answer 1

The correct option is B

Alkalis

Explanation of the correct option :

The correct option is B.

An ammonium salt will liberate ammonia only when it reacts with the hydroxide of alkali metals.

The hydroxides of alkali metals are soluble in water and are basic in nature. They are called alkalis.

For example:

$$\begin{gathered} {\mathrm{NH}}_4\mathrm{OH}\left(\mathrm{aq}\right)+\mathrm{NaOH}\left(\mathrm{aq}\right)\to \mathrm{NaCl}\left(\mathrm{s}\right)+{\mathrm{NH}}_3\left(\mathrm{g}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right) \\ (\mathrm{Ammonium}\mathrm{hydroxide})(\mathrm{Sodium}\mathrm{hydroxide})(\mathrm{Sodium}\mathrm{chloride})\hspace{0.17em}\left(\mathrm{Ammonia}\right)\left(\mathrm{Water}\right) \end{gathered}$$

Explanation of the incorrect options:

Option A:

When Ammonium salt is added to acid, it produces a water-soluble salt.

Option C:

It shows the same reaction as in the case of acids.

Option D:

It will not produce ammonia when ammonium salt reacts with salt solutions.

Hence, the Category of compound which liberates ammonia from ammonium salts are alkalis.