a) 1. 2Na+H2--->2NaH
2. NaH+H2O--->NaOH+H2
3. NaOH+HI--->NaI+H2O
4. 2NaI+CuBr2--->2NaBr+CuI2↓
b) 1. N2+3H2--->2NH3
2. NH3+HCl--->NH4Cl
3. NaOH+NH4Cl--->NH3*H2O+NaCl
c) 1. Cl2+H2--->2HCl
2. 2HCl+Zn--->ZnCl2+H2
3. ZnCl2+Pb(NO3)2--->Zn(NO3)2+PbCl2↓
d) 1. N2+3H2--->2NH3
2. 4NH3+5O2--->4NO+6H2O
3. 2NO+O2--->2NO2
4. 2NO2+H2O--->HNO3+HNO2
5. 2HNO3+Cu(OH)2--->Cu(NO3)2+2H2O