The equations for three reactions are given below. 1. $\text{Pb(NO}_3\text{)}_2(aq) + 2\text{KI}(aq) \rightarrow \text{PbI}_2(s) + 2\text{KNO}_3(aq)$ 2. $2\text{AgNO}_3(aq) + \text{CuI}_2(aq) \rightarrow \text{Cu(NO}_3\text{)}_2(aq) + 2\text{AgI}(s)$ 3. $\text{CuO}(s) + \text{H}_2\text{SO}_4(aq) \rightarrow \text{CuSO}_4(aq) + \text{H}_2\text{O}(l)$ Which of these reactions can be used to prepare a salt by precipitation?
- A1 and 2 only
- B1 and 3 only
- C2 and 3 only
- D1, 2 and 3