Verified answer

Answer:

The balanced chemical equation for the reaction between nitre (KNO3) and concentrated sulfuric acid (H2SO4) at temperatures below 200°C is:

\[2 \text{KNO}_3 + \text{H}_2\text{SO}_4 \rightarrow \text{K}_2\text{SO}_4 + \text{N}_2\text{O}_5 + \text{H}_2\text{O}\]

Explanation:

H2SO4+ HNO3 gives NO2 + HSO4 + H2O