Question

Mg → MgO → MgCl2 → Mg(OH)2 → MgCl2 → HCl

Answer 1

2Mg+O2 > 2MgO
MgO+2HCl = MgCl2 + H2O
MgCl2 + 2NaOH = Mg(OH)2 + 2NaCl
Mg(OH)2 + 2HCl = MgCl2 + H20
MgCl2 + H2SO4 = MgSO4 + 2HCl