Ответ:

s-so2-h2so3-k2so3

S+O2=SO2

SO2+H2O= H2SO3

H2SO3+2K= K2SO3+ H2

Объяснение:

Na-Na2O- NaOH- Na2SO4

4Na+O2=2 Na2O

Na2O+H2O= 2NaOH

2NaOH+H2SO4= Na2SO4+2H2O

Ca-CaO-Ca(OH)2-CaCl2

2Ca+O2= 2CaO

CaO+H2O= Ca(OH)2

Ca(OH)2+2 HCl= CaCl2+ 2H2O

K2O- KOH- KNO3

K2O+H2O= 2KOH

KOH+HNO3= KNO3+H2O