Question

Mg->MgCl2->Mg(OH)2 -> MgO ->Mg(No3)2

Cu->CuO ->CuSO4-> Cu(OH)2 ->CuO

 

Answer 1

Mg+2HCl=MgCL2+H2
MgCl2+2NAOH=Mg(OH)2+2NaCl
Mg(OH)2=MgO+H2O
MgO+2HNO3=Mg(NO3)2+H2O

2Cu+O2=2CuO
CuO+H2SO4=CuSO4+H2O
CuSO4+2NaOH=Cu(OH)2+Na2SO4
Cu(OH)2=CuO+H2O