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2Mg+O2--->2MgO
H2+Cl2--->2HCl
CaCO3---->CaO+CO2
ZnCO3---->ZnO+CO2
2Ca+O2--->2CaO
2HgO---->2Hg+O2
4Fe+3O2---->2Fe2O3
N2+3H2--->2NH3
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