Solved Sample Paper 3 — Question 7

(a) Conditions required for the conversion of ammonia to nitric oxide in presence of air 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)

(b) Conditions required for the conversion of hydrogen chloride to chlorine are:

1. Temperature should be above 500°C.
2. Reaction:
   2HCl $\xrightarrow{\gt 500 \degree\text{C}}$ H₂ + Cl₂

(c) Conditions required for the conversion of sodium bisulphate to sodium sulphate

1. Temperature should be above 200°C.
2. Reaction:
   NaNO₃ + NaHSO₄ $\xrightarrow{\gt 200 \degree\text{C}}$ Na₂SO₄ + HNO₃