Double Displacement Reaction

You are given the following chemical equation : Mg(s) + CuO(s) to MgO(s) + Cu(s) This equation represents : decomposition reaction as well as displacement reaction (b) combination reaction as well as double displacement reaction. (c) redox reaction as well as displacement reaction. (d) double displacement reaction as well as redox reaction.

In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow precipitate of lead iodide is formed. While performing the activity if lead nitrate is not available, which of the following can be used in place of lead nitrate?

Which is a double displacement as well as neutralisation reaction?