When the same element is both oxidized and reduced in a given reaction, disproportionation is said to occur. In which of the following reactions does disproportionation occur? a) 2 H2O (l) ⟶ H3O+ (aq) + OH- (aq) b) SO2 (g) + H2O (l) ⟶ H2SO3 (aq) c) Hg (l) + 2 H2SO4 (aq) ⟶ HgSO4 (s) + SO2 (g) + 2 H2O (l) d) CaCO3 (s) + H2O (l) + CO2 (aq) ⟶ Ca(HCO3)2 (aq) e) None of these reactions are a disproportionation process.

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When the same element is both oxidized and reduced in a given reaction, disproportionation is said to occur.

In which of the following reactions does disproportionation occur?

a) 2 H2O (l) ⟶ H3O+ (aq) + OH- (aq)
b) SO2 (g) + H2O (l) ⟶ H2SO3 (aq)
c) Hg (l) + 2 H2SO4 (aq) ⟶ HgSO4 (s) + SO2 (g) + 2 H2O (l)
d) CaCO3 (s) + H2O (l) + CO2 (aq) ⟶ Ca(HCO3)2 (aq)
e) None of these reactions are a disproportionation process.
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