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b)P4+5O2--->P4O10
P4+3O2--->P4O6
c)S+O2--->SO2
2S+3O2--->2SO3
d)4Cu+O2--->2Cu2O
2Cu+O2--->2CuO
4P + 3O2 -> 2 P2O3
S + O2 -> SO2
4 Cu + O2 -> 2 Cu2O