Which of the listed substances will magnesium hydroxide react with: HBr, SO2, BaO, NaCL, H2O

1) Mg (OH) 2 + 2HBr → MgBr2 + 2H2O (magnesium bromide; exchange reaction, the reaction proceeds, since a weak electrolyte is formed in the form of water).

2) Mg (OH) 2 + SO2 → MgSO3 + H2O (magnesium sulfite; bases react with acid oxides to form salts).

3) Mg (OH) 2 + BaO → the reaction does not proceed, since the bases do not react with basic oxides.

4) Mg (OH) 2 + NaCl → the reaction does not proceed, since only soluble bases react with salts.

5) Mg (OH) 2 + H2O → the reaction does not proceed, since water will not react with a water-insoluble base.