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a) K₂O + H₂SO₄ ---> K₂SO₄ + H₂O
b) CaO + 2HNO₃ --->Ca(NO₃)₂ + H₂O
c) Al2₂O3 + 6HCl ---> 2AlCl₃ + 3H₂O
d) MgO + H₂S --->MgS + H₂O
e) PbO + H₂SO₄ ---> PbSO₄ + H₂O
f) Na₂O + 2HNO₃ ---> 2NaNO₃ + H₂O
g) FeO + H₂SO₃ ---> FeSO₃ + H₂O
h) Li₂O + H₂S ---> Li₂S + H₂O
2)
a) Ca(OH)₂ + CO₂ ---> CaCO₃ + H₂O
b) 2KOH + SO₂ ---> K₂SO₃ + H₂O
c) 12LiOH + P₄O₁₀ ---> 4Li₃PO₄ + 6H₂O
d) Ba(OH)₂ + SO₂ ---> BaSO₃ + H₂O
e) 2KOH + N₂O₃ -----> 2KNO₂ + H₂O