1) basic oxides neutralise acids:
Na2O +2HCl ------> 2NaCl(aq) + H2O (l)
2) Acidic oxides neutralise bases:
SiO2(s) + 2NaOH(aq)------> Na2SiO3(aq) + H2O(l)
P4O10(s) + 12NaOH(aq) ------> 4Na3PO4(aq) + 6H2O(l)
SO2(g) + 2NaOH(aq)-------> Na2SO3 (aq) + H2O(l)
SO3(g) + 2NaOH(aq)-------> Na2SO4 (aq) + H2O(l)
3) Amphoteric oxides neutralise acids and bases
Al2O3 + 3H2SO4----->Al2(SO4)3(aq) + 3H2O(l)
Al2O3(s) + 2NaOH(aq) + 3H2O(l)-------> 2NaAl(OH)4(aq)
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