1. K+O2--->K2O
2. HgO--->Hg+O2
3. N2+H2--->NH3
4. P4O10+H2O--->H3 PO4
2. HgO--->Hg+O2
3. N2+H2--->NH3
4. P4O10+H2O--->H3 PO4
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