Question

When sodium chloride is heated with sulphuric acid below a temperature of 200 degrees celcius, ___ is formed

Answer 1

At lower temperatures, sulphuric acid partially dissociates into a bisulphate ion $\left(HS{O}_{4^{-}}\right)$. At higher temperature $(>{200}^{\circ }C)$, the acid undergoes complete dissociation, releasing $S{O}_4^{2-}$.