Question

$<var>Mg-Mg(NO3)2-MgSO4-Mg(OH)2-MgO-Mg</var>$

Answer 1

Mg+2HNO3=MG(NO3)2+H2

Mg(NO3)2+H2SO4=MgSO4+2HNO3

MgSO4+2KOH=Mg(OH)2+K2SO4

Mg(OH)2+Na2O=Mg0+2NaOH

2MgO=2Mg+O2