The equations show two reactions, P and Q, involving lime (calcium oxide). $\text{P:}\; \text{CaO} + \text{SiO}_2 \rightarrow \text{CaSiO}_3$ $\text{Q:}\; \text{CaO} + \text{SO}_2 \rightarrow \text{CaSO}_3$ In which processes do these reactions take place?
- AP: extraction of iron, Q: extraction of iron
- BP: extraction of iron, Q: flue gas desulfurisation
- CP: flue gas desulfurisation, Q: extraction of iron
- DP: flue gas desulfurisation, Q: flue gas desulfurisation