SO2 + Na2O = Na2SO3
2KOH + H2SO4 = K2SO4 + 2H2O
Hg(NO3)2 + Na2S = 2NaNO3 + HgS↓
2Fe(OH)3 → Fe2O3 + 3H2O
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SO2 + Na2O = Na2SO3
2KOH + H2SO4 = K2SO4 + 2H2O
Hg(NO3)2 + Na2S = 2NaNO3 + HgS↓
2Fe(OH)3 → Fe2O3 + 3H2O