1. S+ O2 = SO2
2. SO2 + H2O = H2SO3
3. H2SO3 + K2O = K2SO3 + H2O
4. K2SO3 + CaSO4 = CaSO3 + K2SO4
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Answers & Comments
1. S+ O2 = SO2
2. SO2 + H2O = H2SO3
3. H2SO3 + K2O = K2SO3 + H2O
4. K2SO3 + CaSO4 = CaSO3 + K2SO4