Discuss the bonding in ammonia molecule, ${\mathrm{NH}}_3$. Then draw a dot-and cross diagram of the molecule. 

Discuss which substance is acting as an acid and which is a base in this reaction. 

$\mathrm{HCl}\left(\mathrm{aq}\right) + {\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right) \to {\mathrm{H}}_3{\mathrm{O}}^{+}\left(\mathrm{aq}\right) + {\mathrm{Cl}}^{-}\left(\mathrm{aq}\right)$

Ammonia is made from its elements in the Haber process. For the ammonium ion give formula.

(A) ${{\mathrm{NH}}_4}^{+}$                         (B) ${{\mathrm{NH}}_2}^{+}$                          (B) ${{\mathrm{NH}}_4}^{-}$

Enter your correct answer as A, B or C.

Give the formulae of the following ammonium salt: ammonium chloride.

$$\begin{gathered} \mathrm{A}:{\mathrm{NH}}_3\mathrm{Cl} \\ \mathrm{B}:{\mathrm{NH}}_4\mathrm{Cl} \\ \mathrm{C}:{\mathrm{NH}}_2{\mathrm{Cl}}_2 \end{gathered}$$

(Enter your correct answer as $\mathrm{A}, \mathrm{B} \mathrm{or} \mathrm{C}$)

Give the formulae of the following ammonium salt: ammonium nitrate.

$$\begin{gathered} \mathrm{A}:{\mathrm{NH}}_4{\mathrm{NO}}_2 \\ \mathrm{B}:{\mathrm{NH}}_3{\mathrm{NO}}_3 \\ \mathrm{C}:{\mathrm{NH}}_4{\mathrm{NO}}_3 \end{gathered}$$

(Enter your correct answer as $\mathrm{A}, \mathrm{B} \mathrm{or} \mathrm{C}$)