(1) 2KNO3 → 2KNO2 + O2.
(2) 2HgO → 2Hg + O2.
(3) 4Al + 3O2 → 2Al2O3.
(4) 2W + 3O2 → 2WO3.
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(1) 2KNO3 → 2KNO2 + O2.
(2) 2HgO → 2Hg + O2.
(3) 4Al + 3O2 → 2Al2O3.
(4) 2W + 3O2 → 2WO3.