P4 + 5O2 —> P4O10
Cr2O6+ 2C —> C2O6 + 2Cr
2K + Cl2 —>2KCl
2Pb + 4S —> Pb2S4
2Al + 3Cu2S —> 6Cu + Al2S3
4Fe + 3O2 —> 2Fe2O3
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P4 + 5O2 —> P4O10
Cr2O6+ 2C —> C2O6 + 2Cr
2K + Cl2 —>2KCl
2Pb + 4S —> Pb2S4
2Al + 3Cu2S —> 6Cu + Al2S3
4Fe + 3O2 —> 2Fe2O3