Getting rid of the pollutant sulfur dioxide, $\text{SO}_2$, entirely is challenging. The amount discharged from furnace chimneys may be reduced by fitting desulfurisation plants. In these plants, the gases are reacted with calcium hydroxide in order to remove the $\text{SO}_2$. What is the main product formed at first?
- A$\text{Ca(HSO}_4)_2$
- B$\text{CaS}$
- C$\text{CaSO}_3$
- D$\text{CaSO}_4$