S-SO2-H2SO3-K2SO3-CaSO3
S+O2=SO2
SO2+H2O=H2SO3
H2SO3+2KOH=K2SO3+2H2O
K2SO3+CaCl2=CaSO3(осадок)+2KCl
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Verified answer
S+O2=SO2
SO2+H2O=H2SO3
H2SO3+2KOH=K2SO3+2H2O
K2SO3+CaCl2=CaSO3(осадок)+2KCl