Cuo + h2 = cu + al + hcl = alcl3 + h2 + o2 = +o2 =cuos+ =so2cus+ =so2+ wo3+ =w+ na2o+h2o= zn+h2so4=n2+ =nh3h2+feo= na2o+ =naohzn+ =znso4+ v2o5+h2=ba+h20=​

CuO+H2=Cu+H2O

2Al+6HCl=2AlCl3+3H2

2H2+O2=2H2O

2Cu+O2=2CuO

S+O2=SO2

2CuS+3O2=2SO2+2CuO

WO3+3H2=W+3H2O

Na2O+H2O=2NaOH

Zn+H2SO4=ZnSO4+H2

N2+3H2=2NH3

H2+FeO=Fe+H2O

Na2O+H2O=2NaOH

Zn+H2SO4=ZnSO4+H2

V2O5+5H2=2V+5H2O

Ba+2H2O=Ba(OH)2+H2