a) Pb(OH)4+2H2SO3--->Pb(SO3)2+4H2O
Pb+2H2SO3--->Pb(SO3)2+2H2
PbO2+2H2SO3--->Pb(SO3)2+2H2O
PbO2+2SO2--->Pb(SO3)2
Pb(OH)4+2SO2--->Pb(SO3)2+2H2O
b) Fe(OH)2+2HNO3--->Fe(NO3)2+2H2O
Fe+2HNO3--->Fe(NO3)2+H2
FeO+2HNO3--->Fe(NO3)2+H2O
FeO+N2O5--->Fe(NO3)2
Fe(OH)2+N2O5--->Fe(NO3)2+H2O
c) 2NaOH+H2S--->Na2S+2H2O
2Na+H2S--->Na2S+H2
Na2O+H2S--->Na2S+H2O
2Na+S--->Na2S
Na2CO3+CaS--->Na2S+CaCO3↓
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a) Pb(OH)4+2H2SO3--->Pb(SO3)2+4H2O
Pb+2H2SO3--->Pb(SO3)2+2H2
PbO2+2H2SO3--->Pb(SO3)2+2H2O
PbO2+2SO2--->Pb(SO3)2
Pb(OH)4+2SO2--->Pb(SO3)2+2H2O
b) Fe(OH)2+2HNO3--->Fe(NO3)2+2H2O
Fe+2HNO3--->Fe(NO3)2+H2
FeO+2HNO3--->Fe(NO3)2+H2O
FeO+N2O5--->Fe(NO3)2
Fe(OH)2+N2O5--->Fe(NO3)2+H2O
c) 2NaOH+H2S--->Na2S+2H2O
2Na+H2S--->Na2S+H2
Na2O+H2S--->Na2S+H2O
2Na+S--->Na2S
Na2CO3+CaS--->Na2S+CaCO3↓