Solved Sample Paper 1 — Question 7

(a) Conditions required for the conversion of potassium nitrate to potassium bisulphate are:

1. Temperature of the reaction should not exceed 200°C.
2. All glass apparatus should be used.
3. Reaction:
   KNO₃ + H₂SO₄ $\xrightarrow{\lt 200 \degree\text{C}}$ KHSO₄ + HNO₃

(b) Conditions required for the conversion of nitrogen and hydrogen to ammonia are:

1. Temperature should be between 450-500°C.
2. Pressure should be above 200 atm.
3. Catalyst used is finely divided iron.
4. Promoter used is traces of molybdenum or Al₂O₃.
5. Reaction:
   N₂ + 3H₂ $\xrightleftharpoons[450-500\text{°C},\text { above }200 \text{ atm}]{\text{Fe and Mo}}$ 2NH₃ + Δ

(c) Conditions required for the conversion of ammonia to nitric oxide are:

1. Temperature should be around 800°C.
2. Catalyst used is Platinum.
3. Reaction:
   4NH₃ + 5O₂ $\xrightarrow[800 \degree \text{C}]{\text{Pt}.}$ 4NO↑ + 6H₂O + Δ
   2NO + O₂ ⟶ 2NO₂ (brown gas)