a) Pb(OH)2+H2S--->PbS↓+2H2O
Pb+H2S--->PbS+H2
PbO+H2S--->PbS+H2O
Pb+S--->PbS
b) NaOH+HNO3--->NaNO3+H2O
2Na+2HNO3--->2NaNO3+H2
Na2O+2HNO3--->2NaNO3+H2O
Na2O+N2O5--->2NaNO3
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a) Pb(OH)2+H2S--->PbS↓+2H2O
Pb+H2S--->PbS+H2
PbO+H2S--->PbS+H2O
Pb+S--->PbS
b) NaOH+HNO3--->NaNO3+H2O
2Na+2HNO3--->2NaNO3+H2
Na2O+2HNO3--->2NaNO3+H2O
Na2O+N2O5--->2NaNO3