Question

mg(oh)2-mgo-mg(no3)2-mgOhno3

Answer 1

Mg(OH)₂ + t = MgO + H₂O
MgO + 2HNO₃ = Mg(NO₃)₂ + H₂O
Mg(NO₃)₂  + 2H-OH = 2Mg(OH)NO₃ + Mg(OH)₂