Question

Mg→MgSO4→Mg(OH)2 →MgCl2

Answer 1

Mg + H2SO4 = MgSO4 + H2
MgSO4 + 2NaOH = Mg(OH)2 + Na2SO4
Mg(OH)2 + 2HCl = MgCl2 + 2H2O