Answer:
um.. is this a quiz or what girl...
Well it's an alkali metal if that's what you're asking<span />
1. Mg + CuSO4 —> MgSO4 + Cu
=> Single displacement reaction
2. 2HCI + Mg(OH)2 —> MgCI2 + H2O
=> Acid - base reaction
3.AgNO3 + NaCI —> AgCI + NaNO3
=> Double displacement reaction
Um i think gold... i think?
The answer is never because there's no electricity
