Qual alternativa tem apenas substancias simples? a)Fe,O3,H2O2
b) CO, NaOH e NaC1
c) He, H2 e CO.
d) O2, N2 e Ag.
e) H2O2, H2O e NH3.
b) CO, NaOH e NaC1
c) He, H2 e CO.
d) O2, N2 e Ag.
e) H2O2, H2O e NH3.
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