Question

1) H2-H2O-NaOH-NaCl
2)S-SO2-H2SO3-CaSO3
3)Zn-ZnO-ZnSO4-Zn(OH)2
С прошлого года не помню как делать(

Answer 1

1)H2+O2=H2O
H2O+NaO=NaOH
NaOH+HCl= NaCl+H2O

Answer 2

S+O2=SO2

Answer 3

SO2+H2O=H2SO3

Answer 4

Ca(OH)2+ H2SO3 = CaSO3 + 2H2O