CH4 + O2 = H2O +CO2

Fe + S = FeS

Zn + HCl = ZnCl2 + H2

H2O = H2 + O2

HBr + NaOH = NaBr + H2 O

Ba + O2 --- ??

Al + FeCl ----- ??

HBr ---- ??

C4H8 + O2 --- ??

MgCO3 + Na2S ----- ??

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