(a) List any two uses of ammonia.

(b) Give the balanced equations for the following conversions

1. Ammonia solution to an amphoteric hydroxide
2. Ammonia to brown gas

(a) Two uses of ammonia are:

1. Liquid ammonia is used as a refrigerant in ice plants.
2. Ammonia is used in the manufacture of nitrogenous fertilisers like ammonium sulphate, ammonium nitrate, urea, etc.

(b) Balanced equations for the conversions are given below:

1. AlCl₃ (aq) + 3NH₄OH (aq) ⟶ Al(OH)₃ ↓ + 3NH₄Cl (aq)

2. 4NH₃ + 5O₂ $\xrightarrow[800 \degree \text{C}]{\text{Pt}.}$ 4NO↑ + 6H₂O + Δ
   2NO + O₂ ⟶ 2NO₂ (brown gas)