State the conditions required for the following reactions.

(a) Conversion of ammonia to nitric oxide in presence of air.

(b) Conversion of hydrogen chloride to chlorine.

(c) Conversion of sodium bisulphate to sodium sulphate.

(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