Can someone explain this to me please :)
Select the correct balanced net ionic equation
for each of the following reactions, occuring
in aqueous solution.
1) Cu(NO3)2 + Ni Cu + Ni(NO3)2
2) (NH4)2SO4 + 2NaBr Na2SO4 + 2NH4Br
3) 2HCl + Mg H2 + MgCl2
A.Mg2+ + 2Cl- MgCl2
B.Ni + Cu2+ +...