Question

Na=NaOh=Mg (Oh)2=MgSo4=Mg (NO3)2

Answer 1

2Na + 2H2O = 2NaOH + H2
2NaOH + MgCl2 = Mg(OH)2 + 2NaCl
Mg(OH)2 + K2SO4 = 2KOH + MgSO4
MgSO4 + Ba(NO3)2 = BaSO4 + Mg(NO3)2