S +O2 = SO2
SO2 + Na2O = Na2SO3
SO2 + H2O = H2SO3
H2SO3 + 2KOH = K2SO3 + H2O
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Verified answer
S +O2 = SO2
SO2 + Na2O = Na2SO3
SO2 + H2O = H2SO3
H2SO3 + 2KOH = K2SO3 + H2O